10-Q 1 d758443d10q.htm FORM 10-Q

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

x | QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended June 30, 2014

OR

¨ | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from to

Commission File Number 000-14656

REPLIGEN CORPORATION

(Exact name of registrant as specified in its charter)

Delaware |  | 04-2729386
(State or other jurisdiction of incorporation or organization) |  | (I.R.S. Employer Identification No.)
41 Seyon Street, Bldg. 1, Suite 100 Waltham, MA |  | 02453
(Address of principal executive offices) |  | (Zip Code)

Registrant’s telephone number, including area code: (781) 250-0111

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15 (d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes x No ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate website, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes x No ¨.

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer |  | ¨ |  | Accelerated filer |  | x
Non-accelerated filer |  | ¨ (Do not check if a smaller reporting company) |  | Smaller reporting company |  | ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act.): Yes ¨ No x

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of July 10, 2014.

Class |  | Number of Shares
Common Stock, par value $.01 per share |  | 32,648,098

##### Table of Contents

Table of Contents

|  |  |  | PAGE |
PART I |  | FINANCIAL INFORMATION |  |  |  |
Item 1. |  | Unaudited Condensed Consolidated Financial Statements |  |  |  |
|  | Condensed Consolidated Balance Sheets as of June 30, 2014 and December 31, 2013 |  |  | 3 |
|  | Condensed Consolidated Statements of Comprehensive Income for the Three and Six-Month Periods Ended June 30, 2014 and 2013 |  |  | 4 |
|  | Condensed Consolidated Statements of Cash Flows for the Six-Month Periods Ended June 30, 2014 and 2013 |  |  | 5 |
|  | Notes to Unaudited Condensed Consolidated Financial Statements |  |  | 6 |
Item 2. |  | Management’s Discussion and Analysis of Financial Condition and Results of Operations |  |  | 19 |
Item 3. |  | Quantitative and Qualitative Disclosures About Market Risk |  |  | 25 |
Item 4. |  | Controls and Procedures |  |  | 25 |
PART II. |  | OTHER INFORMATION |  |  | 26 |
Item 1. |  | Legal Proceedings |  |  | 26 |
Item 1A. |  | Risk Factors |  |  | 26 |
Item 2. |  | Unregistered Sales of Equity Securities and Use of Proceeds |  |  | 26 |
Item 3. |  | Defaults Upon Senior Securities |  |  | 27 |
Item 4. |  | Mine Safety Disclosures |  |  | 27 |
Item 5. |  | Other Information |  |  | 27 |
Item 6. |  | Exhibits |  |  | 28 |
Signatures |  |  | 29 |
Exhibit Index |  |  | 30 |

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REPLIGEN CORPORATION

CONDENSED CONSOLIDATED BALANCE SHEETS

(Unaudited)

|  | June 30, 2014 |  |  | December 31, 2013 |
Assets |  |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 33,755,718 |  |  | $ | 39,829,653 |
Marketable securities |  |  | 16,270,517 |  |  |  | 21,793,550 |
Accounts receivable, less reserve for doubtful accounts of $10,000 |  |  | 9,003,874 |  |  |  | 4,946,132 |
Royalties and other receivables |  |  | 376,540 |  |  |  | 6,730,818 |
Inventories |  |  | 12,823,597 |  |  |  | 11,798,638 |
Deferred tax asset, net |  |  | 39,527 |  |  |  | 1,984 |
Prepaid expenses and other current assets |  |  | 1,587,789 |  |  |  | 1,249,824 |
Total current assets |  |  | 73,857,562 |  |  |  | 86,350,599 |
Property, plant and equipment, at cost: |  |  |  |  |  |  |  |
Leasehold improvements |  |  | 9,212,684 |  |  |  | 8,973,615 |
Equipment |  |  | 14,173,467 |  |  |  | 13,684,954 |
Furniture and fixtures |  |  | 2,217,096 |  |  |  | 2,116,017 |
Leased systems to customers and demonstration systems |  |  | 60,505 |  |  |  | — |
Construction in progress |  |  | 302,996 |  |  |  | 21,647 |
Total property, plant and equipment, at cost |  |  | 25,966,748 |  |  |  | 24,796,233 |
Less: Accumulated depreciation |  |  | (13,416,575 | ) |  |  | (12,287,010 | )
Property, plant and equipment, net |  |  | 12,550,173 |  |  |  | 12,509,223 |
Long-term deferred tax asset, net |  |  | — |  |  |  | 184,848 |
Long-term marketable securities |  |  | 11,896,949 |  |  |  | 12,218,602 |
Intangible assets, net |  |  | 16,119,764 |  |  |  | 6,187,632 |
Goodwill |  |  | 14,174,045 |  |  |  | 994,000 |
Restricted cash |  |  | 450,000 |  |  |  | 200,000 |
Total assets |  | $ | 129,048,493 |  |  | $ | 118,644,904 |
Liabilities and stockholders’ equity |  |  |  |  |  |  |  |
Current liabilities: |  |  |  |  |  |  |  |
Accounts payable |  | $ | 3,895,722 |  |  | $ | 1,721,459 |
Accrued liabilities |  |  | 4,919,679 |  |  |  | 9,579,712 |
Total current liabilities |  |  | 8,815,401 |  |  |  | 11,301,171 |
Long-term deferred tax liability |  |  | 8,882 |  |  |  | — |
Other long-term liabilities |  |  | 4,662,891 |  |  |  | 3,457,631 |
Commitments and contingencies (Note 11) |  |  |  |  |  |  |  |
Stockholders’ equity: |  |  |  |  |  |  |  |
Preferred stock, $.01 par value, 5,000,000 shares authorized, no shares issued or outstanding |  |  | — |  |  |  | — |
Common stock, $.01 par value, 80,000,000 shares authorized, 32,658,782 shares at June 30, 2014 and 31,925,741 shares at December 31, 2013 issued and outstanding |  |  | 326,588 |  |  |  | 319,257 |
Additional paid-in capital |  |  | 196,784,989 |  |  |  | 190,625,937 |
Accumulated other comprehensive income |  |  | 404,639 |  |  |  | 1,998,330 |
Accumulated deficit |  |  | (81,954,897 | ) |  |  | (89,057,422 | )
Total stockholders’ equity |  |  | 115,561,319 |  |  |  | 103,886,102 |
Total liabilities and stockholders’ equity |  | $ | 129,048,493 |  |  | $ | 118,644,904 |

The accompanying notes are an integral part of these condensed consolidated financial statements.

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REPLIGEN CORPORATION

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Unaudited)

|  | Three months ended June 30, |  |  | Six months ended June 30, |
|  | 2014 |  |  | 2013 |  |  | 2014 |  |  | 2013 |
Revenue: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product revenue |  | $ | 15,551,077 |  |  | $ | 13,013,610 |  |  | $ | 29,885,764 |  |  | $ | 24,947,879 |
Royalty and other revenue |  |  | — |  |  |  | 4,495,357 |  |  |  | 1,991,166 |  |  |  | 9,017,081 |
Total revenue |  |  | 15,551,077 |  |  |  | 17,508,967 |  |  |  | 31,876,930 |  |  |  | 33,964,960 |
Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of product revenue |  |  | 6,671,581 |  |  |  | 5,297,809 |  |  |  | 13,006,645 |  |  |  | 12,194,417 |
Cost of royalty revenue |  |  | — |  |  |  | 642,736 |  |  |  | — |  |  |  | 1,219,593 |
Research and development |  |  | 1,430,133 |  |  |  | 2,306,332 |  |  |  | 2,631,123 |  |  |  | 4,489,736 |
Selling, general and administrative |  |  | 4,325,834 |  |  |  | 3,123,940 |  |  |  | 7,709,444 |  |  |  | 6,432,039 |
Contingent consideration – fair value adjustments |  |  | 17,700 |  |  |  | 35,387 |  |  |  | 116,020 |  |  |  | (18,587 | )
Total operating expenses |  |  | 12,445,248 |  |  |  | 11,406,204 |  |  |  | 23,463,232 |  |  |  | 24,317,198 |
Income from operations |  |  | 3,105,829 |  |  |  | 6,102,763 |  |  |  | 8,413,698 |  |  |  | 9,647,762 |
Investment income |  |  | 84,920 |  |  |  | 65,605 |  |  |  | 186,736 |  |  |  | 127,124 |
Interest expense |  |  | (12,780 | ) |  |  | (12,402 | ) |  |  | (26,865 | ) |  |  | (25,933 | )
Other income (expense) |  |  | 65,280 |  |  |  | (122,263 | ) |  |  | 67,785 |  |  |  | (93,182 | )
Income before income taxes |  |  | 3,243,249 |  |  |  | 6,033,703 |  |  |  | 8,641,354 |  |  |  | 9,655,771 |
Income tax provision |  |  | 417,827 |  |  |  | 1,494,516 |  |  |  | 1,538,829 |  |  |  | 2,778,348 |
Net income |  | $ | 2,825,422 |  |  | $ | 4,539,187 |  |  | $ | 7,102,525 |  |  | $ | 6,877,423 |
Earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.09 |  |  | $ | 0.14 |  |  | $ | 0.22 |  |  | $ | 0.22 |
Diluted |  | $ | 0.09 |  |  | $ | 0.14 |  |  | $ | 0.22 |  |  | $ | 0.21 |
Weighted average shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 32,233,694 |  |  |  | 31,643,695 |  |  |  | 32,098,269 |  |  |  | 31,443,264 |
Diluted |  |  | 33,076,384 |  |  |  | 32,317,156 |  |  |  | 32,963,554 |  |  |  | 32,115,519 |
Other comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on investments |  |  | 9,882 |  |  |  | (4,638 | ) |  |  | 12,066 |  |  |  | (6,621 | )
Foreign currency translation (loss) |  |  | (1,462,603 | ) |  |  | (883,888 | ) |  |  | (1,605,757 | ) |  |  | (1,140,496 | )
Comprehensive income |  | $ | 1,372,701 |  |  | $ | 3,650,661 |  |  | $ | 5,508,834 |  |  | $ | 5,730,306 |

The accompanying notes are an integral part of these condensed consolidated financial statements.

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REPLIGEN CORPORATION

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

|  | Six months ended June 30, |
|  | 2014 |  |  | 2013 |
Cash flows from operating activities: |  |  |  |  |  |  |  |
Net income |  | $ | 7,102,525 |  |  | $ | 6,877,423 |
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |  |  |  |  |  |
Depreciation and amortization |  |  | 1,855,392 |  |  |  | 1,508,943 |
Stock-based compensation expense |  |  | 852,637 |  |  |  | 562,762 |
Deferred tax expense |  |  | 153,704 |  |  |  | 992,856 |
Loss (gain) on revaluation of contingent consideration |  |  | 116,020 |  |  |  | (18,587 | )
Loss on disposal of assets |  |  | 2,640 |  |  |  | — |
Changes in assets and liabilities: |  |  |  |  |  |  |  |
Accounts receivable |  |  | (2,547,815 | ) |  |  | (814,837 | )
Royalties and other receivables |  |  | 6,354,278 |  |  |  | 3,817,118 |
Inventories |  |  | (286,261 | ) |  |  | 360,872 |
Prepaid expenses and other current assets |  |  | (300,432 | ) |  |  | (334,937 | )
Accounts payable |  |  | 2,069,947 |  |  |  | (958,014 | )
Accrued liabilities |  |  | (4,844,919 | ) |  |  | 592,030 |
Long-term liabilities |  |  | (207,390 | ) |  |  | (194,945 | )
Net cash provided by operating activities |  |  | 10,320,326 |  |  |  | 12,390,684 |
Cash flows from investing activities: |  |  |  |  |  |  |  |
Purchases of marketable securities |  |  | (18,635,241 | ) |  |  | (18,088,695 | )
Redemptions of marketable securities |  |  | 24,491,993 |  |  |  | 13,383,003 |
Acquisition of assets of Refine Technology, LLC |  |  | (21,235,937 | ) |  |  | — |
Increase in restricted cash |  |  | (250,000 | ) |  |  | — |
Purchases of property, plant and equipment |  |  | (1,224,091 | ) |  |  | (1,105,217 | )
Net cash used in investing activities |  |  | (16,853,276 | ) |  |  | (5,810,909 | )
Cash flows from financing activities: |  |  |  |  |  |  |  |
Exercise of stock options |  |  | 1,337,906 |  |  |  | 2,034,545 |
Net cash provided by financing activities |  |  | 1,337,906 |  |  |  | 2,034,545 |
Effect of exchange rate changes on cash and cash equivalents |  |  | (878,891 | ) |  |  | (492,563 | )
Net (decrease) increase in cash and cash equivalents |  |  | (6,073,935 | ) |  |  | 8,121,757 |
Cash and cash equivalents, beginning of period |  |  | 39,829,653 |  |  |  | 29,209,821 |
Cash and cash equivalents, end of period |  | $ | 33,755,718 |  |  | $ | 37,331,578 |
Supplemental disclosure of non-cash investing activities: |  |  |  |  |  |  |  |
Income taxes paid |  | $ | 668,000 |  |  | $ | 771,000 |

The accompanying notes are an integral part of these condensed consolidated financial statements.

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REPLIGEN CORPORATION

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

1. | Basis of Presentation

The consolidated financial statements included herein have been prepared by Repligen Corporation (the “Company,” “Repligen” or “we”) in accordance with generally accepted accounting principles in the United States (“U.S. GAAP”) and pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”), for Quarterly Reports on Form 10-Q and Article 10 of Regulation S-X and do not include all of the information and footnote disclosures required by U.S. GAAP. These consolidated financial statements should be read in conjunction with the audited consolidated financial statements and accompanying notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2013.

In the opinion of management, the accompanying unaudited consolidated financial statements include all adjustments, consisting of only normal, recurring adjustments necessary for a fair presentation of the financial position, results of operations and cash flows. The results of operations for the interim periods presented are not necessarily indicative of results to be expected for the entire year.

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

2. | Acquisitions, Goodwill and Other Intangible Assets

Acquisitions

Refine Technology, LLC

On June 2, 2014, pursuant to the terms of the Asset Purchase Agreement, dated as of June 2, 2014 (the “Asset Purchase Agreement”), by and among the Company, Refine Technology, LLC (a limited liability company formed under the laws of the State of New Jersey) (“Refine”), the members of Refine Technology, LLC, Jerry Shevitz, Refine Technology Sales LLC (a limited liability company formed under the laws of the State of New Jersey) and Refine Technology Sales Asia PTE. LTD. (a limited private company organized in the Republic of Singapore), the Company acquired the business of Refine, including Refine’s Alternating Tangential Flow (“ATF”) System, a market-leading device used to significantly increase product yield during the fermentation step of the biologic drug manufacturing process (the “Refine Business” and the acquisition of the Refine Business, the “Refine Acquisition”). Pursuant to the Asset Purchase Agreement, Repligen purchased all of the assets related to Refine’s ATF system and assumed certain specified liabilities related to Refine’s ATF system. This acquisition strengthens Repligen’s bioprocessing business by adding a complementary product line while expanding our direct sales presence worldwide. The transaction is accounted for as a purchase of a business under ASC 805, Business Combinations. The terms of the acquisition included an upfront cash payment of $21,235,937 which is subject to a potential adjustment upon a final determination of working capital, issuance of 215,285 of the Company’s $0.01 par value common stock valued at $4,000,000, future potential milestone payments totaling up to $10,900,000 if specific sales targets are met for the years 2014, 2015 and 2016, and future potential payments up to $7,500,000 out of any amounts that might be received in connection with the resolution, withdrawal or settlement of certain patent disputes with a third party. The $10,900,000 contingent consideration had an initial probability weighted fair value at acquisition of $1,400,000. The $7,500,000 contingent consideration had only a nominal probability weighted fair value at acquisition. In addition to the initial consideration, approximately $725,000 will be paid to Refine in monthly installments over six months under a Transition Services Agreement under which certain employees of Refine will continue to provide services to the Company in support of the Refine Business. Since these payments are contingent upon the future service they will be recognized as operating expense ratably as the services are provided. For the three and six months ended June 30, 2014, $122,000 was recorded in the consolidated statement of operations related to the Transition Services Agreement.

Consideration Transferred

The Company accounted for the Refine Acquisition as the purchase of a business under U.S. GAAP. Under the acquisition method of accounting, the assets of the Refine Business were recorded as of the acquisition date, at their respective fair values, and consolidated with those of Repligen. The fair value of the net assets acquired was approximately $26,635,937.

The preparation of the valuation required the use of significant assumptions and estimates. Critical estimates included, but were not limited to, future expected cash flows, including projected revenues and expenses, and the applicable discount rates. These estimates were based on assumptions that the Company believes to be reasonable. However, actual results may differ from these estimates.

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The total consideration transferred follows:

Cash consideration |  | $ | 21,235,937 |
Value of common stock issued |  |  | 4,000,000 |
Estimated fair value of contingent consideration |  |  | 1,400,000 |
Total consideration transferred |  | $ | 26,635,937 |

The fair value of contingent consideration was determined based upon a probability weighted analysis of expected future milestone and settlement payments to be made to the seller. The Company could make payments of up to $10,900,000 if specific sales targets are met for years 2014, 2015 and 2016 and up to $7,500,000 out of any receipts that might be received in connection with the resolution, withdrawal or settlement of certain patent disputes with a third party. The liability for contingent consideration is included in current and long-term liabilities on the consolidated balance sheets and will be remeasured at each reporting period until the contingency is resolved.

Acquisition related costs are not included as a component of consideration transferred, but are expensed in the periods in which the costs are incurred. The Company expects to incur approximately $795,000 in transaction costs related to the Refine Acquisition. The transaction costs are included in selling, general and administrative expenses in the consolidated statements of operations.

Fair Value of Net Assets Acquired

The allocation of purchase price was based on preliminary estimates of the fair value of assets acquired and liabilities assumed as of June 2, 2014. The components and allocation of the purchase price consists of the following approximate amounts:

Accounts receivable |  | $ | 1,646,746 |
Inventory |  |  | 1,053,959 |
Other current assets |  |  | 59,081 |
Fixed assets |  |  | 353,505 |
Customer relationships |  |  | 6,400,000 |
Developed technology |  |  | 2,000,000 |
In process research and development (“IPR&D”) |  |  | 1,600,000 |
Trademark and trade name |  |  | 700,000 |
Accounts payable and other liabilities assumed |  |  | (357,399 | )
Goodwill |  |  | 13,180,045 |
Net assets acquired |  | $ | 26,635,937 |

Of the consideration paid, approximately $6,400,000 represents the fair value of customer relationships that will be amortized over the determined useful life of 10 years and approximately $2,000,000 represents the fair value of developed technology that will be amortized over a determined useful life of 15 years. Approximately $700,000 represents the fair value of trademark and trade name determined to have an indefinite useful life and not subject to amortization.

Approximately $1,600,000 of the consideration paid represents the fair value of acquired IPR&D projects that are considered identifiable assets as of the acquisition date. Those assets are considered indefinite lived until efforts associated with the projects are completed or abandoned. The major acquired technology IPR&D relates to the development of a single use system product extension to the ATF system business.

The excess of the purchase price over the fair value of tangible and intangible assets acquired was recorded to goodwill. The goodwill recognized is attributable to expected synergies that the Company will realize from this acquisition. This goodwill is deductible for tax purposes over the next 15 years.

The assessment of fair value is preliminary and is based on information that was available to management at the time the condensed consolidated financial statements were prepared. The Company is waiting for additional information from the seller and, accordingly, such amounts may change. The most significant open items include the working capital adjustment, finalization of the intangible asset valuation and obtaining certain information from the seller related to fixed assets.

Revenue, Net Loss and Pro Forma Presentation

The Company recorded revenue from Refine of $465,993 and net income of $56,292 in the period from June 2, 2014 through June 30, 2014.

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The Company has included the operating results of Refine in its consolidated statements of operations since the June 2, 2014 acquisition date. The following table presents unaudited supplemental pro forma information as if the Refine Acquisition had occurred as of January 1, 2013.

|  | Three Months ended June 30, |  |  | Six Months ended June 30, |
|  | (in thousands, except per share amounts) |  |  | (in thousands, except per share amounts) |
|  | 2014 |  |  | 2013 |  |  | 2014 |  |  | 2013 |
Total revenue |  | $ | 17,707 |  |  | $ | 19,047 |  |  | $ | 35,659 |  |  | $ | 37,343 |
Net income |  |  | 3,818 |  |  |  | 4,394 |  |  |  | 7,996 |  |  |  | 6,373 |
Earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.12 |  |  | $ | 0.14 |  |  | $ | 0.25 |  |  | $ | 0.20 |
Diluted |  | $ | 0.12 |  |  | $ | 0.14 |  |  | $ | 0.24 |  |  | $ | 0.20 |

The unaudited pro forma information for the three and six months ended June 30, 2013 and 2014 was calculated after applying the Company’s accounting policies and the impact of acquisition date fair value adjustments. Unaudited pro forma net income for the three and six months ended June 30, 2014 was adjusted to exclude acquisition-related transaction costs. These expenses have been added to the unaudited pro forma net income for the three and six months ended June 30, 2013. In addition, the unaudited pro forma net income for the three and six months ended June 30, 2014 was adjusted to exclude nonrecurring expenses related to the fair value adjustments associated with the acquisition of Refine that were recorded by the Company. The unaudited pro forma net income for the three and six months ended June 30, 2013 was adjusted to include these acquisition-related transaction costs and expenses related to the fair value adjustments.

These pro forma condensed consolidated financial results have been prepared for comparative purposes only and include certain adjustments to reflect the pro forma results of operations as if the acquisition had occurred as of the beginning of the periods presented, such as fair value adjustments to inventory and increased amortization for the fair value of acquired intangible assets. The pro forma information does not reflect the effect of costs or synergies that would have been expected to result from the integration of the acquisition. The pro forma information does not purport to be indicative of the results of operations that actually would have resulted had the combination occurred at the beginning of each period presented, or of future results of the consolidated entities.

Goodwill

Goodwill is not amortized and is reviewed for impairment at least annually. There was no evidence of impairment to goodwill at June 30, 2014. There were no goodwill impairment charges during the three or six-month periods ended June 30, 2014.

Other Intangible Assets

Intangible assets are amortized over their useful lives using the estimated economic benefit method, as applicable, and the amortization expense is recorded within selling, general and administrative expense in the Company’s statements of comprehensive income (loss). Intangible assets and their related useful lives are reviewed at least annually to determine if any adverse conditions exist that would indicate the carrying value of these assets may not be recoverable. More frequent impairment assessments are conducted if certain conditions exist, including a change in the competitive landscape, any internal decisions to pursue new or different technology strategies, a loss of a significant customer, or a significant change in the marketplace, including changes in the prices paid for our products or changes in the size of the market for our products. An impairment results if the carrying value of the asset exceeds the estimated fair value of the asset. If the estimate of an intangible asset’s remaining useful life is changed, the remaining carrying amount of the intangible asset is amortized prospectively over the revised remaining useful life. The Company continues to believe that its intangible assets are recoverable at June 30, 2014.

Other intangible assets consisted of the following at June 30, 2014:

|  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Weighted Average Useful Life (in years) |
Technology – developed |  | $ | 3,428,573 |  |  | $ | (629,007 | ) |  |  | 12 |
In process research and development |  | $ | 1,600,000 |  |  |  | — |  |  |  | — |
Patents |  |  | 240,000 |  |  |  | (132,500 | ) |  |  | 8 |
Customer relationships |  |  | 13,047,732 |  |  |  | (2,135,034 | ) |  |  | 9 |
Trademark / tradename |  |  | 700,000 |  |  |  | — |  |  |  | — |
Total other intangible assets |  | $ | 19,016,305 |  |  | $ | (2,896,541 | ) |  |  | 10 |

Other intangible assets consisted of the following at December 31, 2013:

|  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Weighted Average Useful Life (in years) |
Technology – developed |  | $ | 1,455,382 |  |  | $ | (537,589 | ) |  |  | 8 |
Patents |  |  | 240,000 |  |  |  | (117,500 | ) |  |  | 8 |
Customer relationships |  |  | 6,897,052 |  |  |  | (1,749,713 | ) |  |  | 8 |
Total other intangible assets |  | $ | 8,592,434 |  |  | $ | (2,404,802 | ) |  |  | 8 |

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Amortization expense for amortized intangible assets was approximately $570,000 for the six months ended June 30, 2014. The Company expects to record amortization expense of approximately $1,765,000 in each of the next five years related to these intangible assets.

3. | Revenue Recognition

The Company’s revenue recognition policy is to recognize revenues from product sales and services in accordance with ASC 605, Revenue Recognition. These standards require that revenues are recognized when persuasive evidence of an arrangement exists, product delivery, including customer acceptance, has occurred or services have been rendered, the price is fixed or determinable and collectability is reasonably assured. Determination of whether these criteria have been met are based on management’s judgments primarily regarding the fixed nature of the fee charged for the product delivered and the collectability of those fees. The Company has a few longstanding customers who comprise the majority of revenue and have excellent payment histories and therefore the Company does not require collateral. The Company has had no significant write-offs of uncollectible invoices in the periods presented. When more than one element such as equipment, consumables, and services are contained in a single arrangement, the Company allocates revenue between the elements based on each element’s relative selling price, provided that each element meets the criteria for treatment as a separate unit of accounting. An item is considered a separate unit of accounting if it has value to the customer on a stand-alone basis. The selling price of the undelivered elements is determined by the price charged when the element is sold separately, or in cases when the item is not sold separately, by third-party evidence of selling price or management’s best estimate of selling price.

Product Sales

The Company’s product revenues are from the sale of bioprocessing products, equipment devices, and related consumables used with these equipment devices to customers in the life science and biopharmaceutical industries. On product sales to end customers, revenue is recognized, net of discounts, when both the title and risk of loss have transferred to the customer, as determined by the shipping terms provided there are no uncertainties regarding acceptance, and all obligations have been completed. Generally, our product arrangements for equipment sales are multiple element arrangements, and may include services, such as installation and training, and multiple products, such as consumables and spare parts. In accordance with ASC 605-25, based on terms and conditions of the product arrangements, the Company believes that these services and undelivered products can be accounted for separately from the delivered product element as the delivered products have value to our customers on a standalone basis. Accordingly, revenue for services not yet performed at the time of product shipment are deferred and recognized as such services are performed. The relative selling price of any undelivered products is also deferred at the time of shipment and recognized as revenue when these products are delivered. For product sales to distributors, the Company recognizes revenue for both equipment and consumables upon delivery to the distributor’s or end user’s location. In general, distributors are responsible for shipment to the end customer along with installation, training and acceptance of the equipment by the end customer. Shipments to distributors are not contingent upon resale of the product.

At the time of sale, the Company also evaluates the need to accrue for warranty and sales returns. The supply agreements the Company has with its customers and the related purchase orders identify the terms and conditions of each sale and the price of the goods ordered. Due to the nature of the sales arrangements, inventory produced for sale is tested for quality specifications prior to shipment. Since the product is manufactured to order and in compliance with required specifications prior to shipment, the likelihood of sales return, warranty or other issues is largely diminished. Furthermore, there is no customer right of return in our sales agreements. Sales returns and warranty issues are infrequent and have had nominal impact on the Company’s financial statements historically.

Sale of Intellectual Property to BioMarin

In January 2014, the Company entered into an asset purchase agreement (the “Asset Purchase Agreement”) with BioMarin Pharmaceutical Inc. (“BioMarin”) to sell Repligen’s histone deacetylase inhibitor (HDACi) portfolio. Pursuant to the terms of the Asset Purchase Agreement, the Company received $2 million from BioMarin as an upfront payment on January 30, 2014. The Company is entitled to receive up to $160 million in potential future milestone payments for the development, regulatory approval and commercial sale of portfolio compounds included in the agreement. These potential milestone payments are approximately 37% related to clinical development and 63% related to initial commercial sales in specific geographies. In addition, Repligen is eligible to receive royalties on sales of therapeutic products originating from the HDACi portfolio. The royalty rates are tiered and begin in the mid-single-digits for the first HDACi portfolio product and for the first non-HDACi portfolio product with lesser amounts for any backup products developed under the Asset Purchase Agreement. Repligen’s receipt of these royalties is subject to customary offsets and deductions. There are no refund provisions in this agreement. The Company recognized $2 million of revenue in the three months ended March 31, 2014 related to the transfer of the HDACi technology under the Asset Purchase Agreement. Any milestones earned upon specified clinical development or commercial sales events or future royalty payments, under the Asset Purchase Agreement will be recognized as revenue when they are earned.

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Activities under this agreement were evaluated in accordance with ASC 605-25 to determine if they represented a multiple element revenue arrangement. We identified the following deliverables in the BioMarin agreement:

| • |  | The assignment by Repligen to BioMarin of the Repligen Technology (“Repligen Know-How” and “Repligen Patents”) and the Scripps Agreement (the “Transferred Assets”);

| • |  | The transfer of certain notebooks, data, documents, biological materials (if any) and other such documents in our possession that might be useful to further development of the program (the “Technology Transfer”).

Two criteria must be met in order for a deliverable to be considered a separate unit of accounting. The first criterion requires that the delivered item or items have value to the customer on a stand-alone basis. The second criterion, which relates to evaluating a general right of return, is not applicable because such a provision does not exist in the Asset Purchase Agreement. The deliverables outlined above were deemed to have stand-alone value and to meet the criteria to be accounted for as separate units of accounting. Factors considered in this determination included, among other things, BioMarin’s right under the agreement to assign the Transferred Assets, whether any other vendors sell the items separately and if BioMarin could use the delivered item for its intended purpose without the receipt of the remaining deliverables. If multiple deliverables included in an arrangement are separable into different units of accounting, the multiple-element arrangements guidance addresses how to allocate the arrangement consideration to those units of accounting. The amount of allocable arrangement consideration is limited to amounts that are fixed or determinable. Arrangement consideration is allocated at the inception of the arrangement to the identified units of accounting based on their relative selling price.

We identified the arrangement consideration to allocate among the units of accounting as the $2.0 million non-refundable up-front payment and the $126,375 payment to be received upon completion of the Technology Transfer. We excluded the potential milestone payments provided for in the Asset Purchase Agreement from the arrangement consideration as they were not considered fixed or determinable at the time the Asset Purchase Agreement was signed. Because we had not sold these items on a standalone basis previously, we had no vendor-specific objective evidence of selling price. Furthermore, we did not have detailed third-party evidence of selling price, and as a result we used our best estimate of selling price for each item. In determining these prices, we considered what we would be willing to sell the items for on a standalone basis, what the market would bear for such items and what another party might charge for these items.

The up-front arrangement consideration allocated to the Transferred Assets was recognized upon execution of the Asset Purchase Agreement as the risks and rewards associated with the Transferred Assets transferred at that time. We used a discounted cash flow analysis to determine the value of the Transferred Assets. Key assumptions in the analysis included: the estimated market size for a compound targeted at Friedreich’s ataxia, the estimated remaining costs of development and time to commercialization, and the probability of successfully developing and commercializing the program. Based on this analysis, we allocated $2,115,000 to the value of the Transferred Assets. However, as the recognized revenue is limited to the non-contingent consideration received, we recognized $2,000,000, the amount of the up-front payment, as revenue in the three months ended March 31, 2014.

The estimated selling price of the Technology Transfer items was approximately $300,000 resulting in consideration allocation of approximately $11,000. However, as this item was not delivered prior to March 31, 2014, we did not recognize any revenue related to the Technology Transfer in the three months ended March 31, 2014. We expect the Technology Transfer to be delivered by September 30, 2014.

We believe that a change in the key assumptions used to determine best estimate of selling price for each of the deliverables would not have a significant effect on the allocation of arrangement consideration.

In addition to the $2 million up-front payment, we are also eligible to receive up to $160 million in potential milestone payments from BioMarin comprised of:

| • |  | Up to $60 million related to the achievement of specified clinical and regulatory milestone events; and

| • |  | Up to $100 million related to the achievement of specified commercial sales events, specifically the first commercial sale in specific territories.

We evaluated the potential milestones in accordance with ASC 605-28, which allows an entity to make an accounting policy election to recognize a payment that is contingent upon the achievement of a substantive milestone in its entirety in the period in which the milestone is achieved. This evaluation included an assessment of the risks that must be overcome to achieve the respective milestone as well as whether the achievement of the milestone was due in part to our initial clinical work, the level of effort and investment required to achieve the respective milestone and whether the milestone consideration is reasonable relative to all deliverables and payment terms in the arrangement. There is considerable judgment involved in determining whether a milestone satisfies all of the criteria required to conclude that a milestone is substantive. Milestones that are not considered substantive are recognized as earned if there are no remaining performance obligations or over the remaining period of performance, assuming all other revenue recognition criteria are met.

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We believe that the $60 million of specified clinical and regulatory milestone payments are substantive. Therefore, any such milestones achieved will be recognized as revenue when earned.

Any milestones achieved upon specified commercial sales events or future royalty payments are considered contingent revenue under the Asset Purchase Agreement, and will be recognized as revenue when they are earned as there are no undelivered elements remaining and no continuing performance obligations under the arrangement.

Pfizer License Agreement

In December 2012, the Company entered into an exclusive worldwide licensing agreement (the “License Agreement”) with Pfizer Inc. (“Pfizer”) to advance the spinal muscular atrophy program, or SMA program. Pursuant to the terms of the License Agreement, the Company received $5 million from Pfizer as an upfront payment on January 22, 2013 and a $1 million milestone payment on September 4, 2013. The Company is entitled to receive up to $64 million in potential future payments, a portion of which may be owed to third parties. These potential payments are approximately equally divided between milestones related to clinical development and initial commercial sales in specific geographies. In addition, the Company is entitled to receive royalties on any future sales of RG3039 or any SMA compounds developed under the License Agreement. The royalty rates are tiered and begin in the high single-digits for RG3039 or lesser amounts for any backup compounds developed under the License Agreement. Repligen’s receipt of these royalties is subject to an obligation under an existing in-license agreement and other customary offsets and deductions. There are no refund provisions in this agreement. The Company recognized $4,876,000 of revenue related to the value of the license in the year ended December 31, 2012. The Company recognized $0 and $69,000 of revenue in the three months ended June 30, 2014 and 2013, respectively, related to the delivery of clinical and transition services under the License Agreement. For the six months ended June 30, 2014 and 2013, the Company recognized $0 and $124,000, respectively, of revenue. Any milestones earned upon specified commercial sales events or future royalty payments, under the License Agreement will be recognized as revenue when they are earned.

Orencia Royalty

In April 2008, the Company settled its outstanding litigation with Bristol-Myers Squibb Company (“Bristol”) and began recognizing royalty revenue in fiscal year 2009 for Bristol’s net sales in the United States of Orencia® which is used in the treatment of rheumatoid arthritis. The royalty agreement with Bristol provided that the Company would receive such royalty payments on sales of Orencia® by Bristol through December 31, 2013. These royalty payments have ceased. Pursuant to the settlement with Bristol (“Bristol Settlement”), the Company recognized royalty revenue of approximately $0 and $4,285,000 for the three months ended June 30, 2014 and 2013, respectively. For the six months ended June 30, 2014 and 2013, the Company recognized Bristol royalty revenue of approximately $0 and $8,131,000, respectively. Revenue earned from Bristol royalties was recorded in the periods when it was earned based on royalty reports sent by Bristol to the Company. The Company has no continuing obligations to Bristol as a result of this settlement.

Pursuant to the Bristol Settlement, Repligen remitted to the University of Michigan 15% of all royalty revenue received from Bristol. Royalty expense for the three months ended June 30, 2014 and 2013 was approximately $0 and $643,000, respectively. For the six months ended June 30, 2014 and 2013, the Company incurred royalty expense of approximately $0 and $1,220,000, respectively. This operating expense has been included in the Company’s statements of comprehensive income under the line item “Cost of royalty revenue.”

Research and Development Agreements

For the three months ended June 30, 2014 and 2013, the Company recognized approximately $0 and $142,000 of revenue, respectively, from sponsored research and development projects under an agreement with the National Institutes of Health / Scripps Research Institute. For the six months ended June 30, 2014 and 2013, the Company recognized approximately $0 and $762,000 of revenue, respectively, from sponsored research and development projects under an agreement with the National Institutes of Health / Scripps Research Institute.

Research revenue is recognized when the expense has been incurred and services have been performed. Determination of which incurred costs qualify for reimbursement under the terms of the Company’s contractual agreements and the timing of when such costs were incurred involves the judgment of management. The Company’s calculations are based on the agreed-upon terms as stated in the arrangements. However, should any estimated calculations change or be challenged by other parties to the agreements, research revenue may be adjusted in subsequent periods. The calculations have not historically changed or been challenged, and the Company does not anticipate any significant subsequent change in its revenue related to sponsored research and development projects.

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4. | Accumulated Other Comprehensive Income

The following table summarizes the changes in accumulated other comprehensive income by component:

(In thousands) |  | Unrealized gain (loss) on investments |  |  | Foreign currency translation gain (loss) |  |  | Total |
Balance at December 31, 2013 |  | $ | (5,281 | ) |  | $ | 2,003,611 |  |  | $ | 1,998,330 |
Other comprehensive income before reclassifications |  |  | 12,066 |  |  |  | (1,605,757 | ) |  |  | (1,593,691 | )
Amounts reclassified from accumulated other comprehensive income |  |  | — |  |  |  | — |  |  |  | — |
Net current period other comprehensive income |  |  | 12,066 |  |  |  | (1,605,757 | ) |  |  | (1,593,691 | )
Balance at June 30, 2014 |  | $ | 6,785 |  |  | $ | 397,854 |  |  | $ | 404,639 |

5. | Earnings Per Share

The Company reports earnings per share in accordance with Accounting Standards Codification Topic 260, “Earnings Per Share,” which establishes standards for computing and presenting earnings per share. Basic earnings per share is computed by dividing net income available to common shareholders by the weighted-average number of common shares outstanding during the period. Diluted earnings per share is computed by dividing net income available to common shareholders by the weighted-average number of common shares and dilutive common share equivalents then outstanding. Potential common share equivalents consist of restricted stock awards and the incremental common shares issuable upon the exercise of stock options. Under the treasury stock method, unexercised “in-the-money” stock options and warrants are assumed to be exercised at the beginning of the period or at issuance, if later. The assumed proceeds are then used to purchase common shares at the average market price during the period. Share-based payment awards that entitle their holders to receive non-forfeitable dividends before vesting are considered participating securities and are considered in the calculation of basic and diluted earnings per share.

Basic and diluted weighted average shares outstanding were as follows:

|  | Three months ended June 30, |  |  | Six months ended June 30, |
|  | 2014 |  |  | 2013 |  |  | 2014 |  |  | 2013 |
Weighted average common shares |  |  | 32,233,694 |  |  |  | 31,643,695 |  |  |  | 32,098,269 |  |  |  | 31,443,264 |
Dilutive common stock options |  |  | 842,690 |  |  |  | 673,461 |  |  |  | 865,285 |  |  |  | 672,255 |
Weighted average common shares, assuming dilution |  |  | 33,076,384 |  |  |  | 32,317,156 |  |  |  | 32,963,554 |  |  |  | 32,115,519 |

At June 30, 2014, there were outstanding options to purchase 1,312,741 shares of the Company’s common stock at a weighted average exercise price of $7.19 per share. For the three and six-month periods ended June 30, 2014, 264,317 and 300,908 shares of the Company’s common stock, respectively, were excluded from the calculation of diluted earnings per share because the exercise prices of the stock options were greater than or equal to the average price of the common shares, and were therefore anti-dilutive.

At June 30, 2013, there were outstanding options to purchase 1,795,588 shares of the Company’s common stock at a weighted average exercise price of $4.53 per share. For the three and six-month periods ended June 30, 2013, 520,552 and 540,552 shares of the Company’s common stock, respectively, were excluded from the calculation of diluted earnings per share because the exercise prices of the stock options were greater than or equal to the average price of the common shares, and were therefore anti-dilutive.

6. | Stock-Based Compensation

For the three months ended June 30, 2014 and 2013, the Company recorded stock-based compensation expense of $545,212 and $312,691, respectively, for share-based awards granted under the Second Amended and Restated 2001 Repligen Corporation Stock Plan (the “2001 Plan”) and the Repligen Corporation Amended and Restated 2012 Stock Option and Incentive Plan (the “2012 Plan,” and collectively with the 2001 Plan and the 1992 Repligen Corporation Stock Option Plan, the “Plans”). The Company recorded stock-based compensation expense of $852,637 and $562,762 for the six-month periods ended June 30, 2014 and 2013, respectively, for share-based awards granted under the Plans.

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The following table presents stock-based compensation expense included in the Company’s consolidated statements of comprehensive income:

|  | Three months ended June 30, |  |  | Six months ended June 30, |
|  | 2014 |  |  | 2013 |  |  | 2014 |  |  | 2013 |
Cost of product revenue |  | $ | 63,285 |  |  | $ | 11,428 |  |  | $ | 89,848 |  |  | $ | 23,093 |
Research and development |  |  | 80,392 |  |  |  | 36,081 |  |  |  | 111,995 |  |  |  | 43,721 |
Selling, general and administrative |  |  | 401,535 |  |  |  | 265,182 |  |  |  | 650,794 |  |  |  | 495,948 |
Total |  | $ | 545,212 |  |  | $ | 312,691 |  |  | $ | 852,637 |  |  | $ | 562,762 |

The 2012 Plan allows for the granting of incentive and nonqualified options to purchase shares of common stock, restricted stock and other equity awards. Incentive options granted to employees under the Plans generally vest over a four to five-year period, with 20%-25% vesting on the first anniversary of the date of grant and the remainder vesting in equal yearly installments thereafter. Nonqualified options issued to non-employee directors and consultants under the Plans generally vest over one year. Options granted under the Plans have a maximum term of ten years from the date of grant and generally, the exercise price of the stock options equals the fair market value of the Company’s common stock on the date of grant. At June 30, 2014, options to purchase 1,312,741 shares were outstanding under the Plans. At June 30, 2014, 2,818,751 shares were available for future grant under the Plans.

The Company uses the Black-Scholes option pricing model to calculate the fair value of share-based awards on the grant date. The Company measures stock-based compensation cost at the grant date based on the estimated fair value of the award, and recognizes awards with service based vesting as expense over the employee’s requisite service period on a straight-line basis. The Company records the expense for share-based awards subject to performance-based milestone vesting over the remaining service period when management determines that achievement of the milestone is probable. Management evaluates whether the achievement of a performance-based milestone is probable as of the reporting date. The Company has no awards that are subject to market conditions. The Company recognizes stock-based compensation expense for options that are ultimately expected to vest, and accordingly, such compensation expense has been adjusted for estimated forfeitures.

Information regarding option activity for the six months ended June 30, 2014 under the Plans is summarized below:

|  | Options Outstanding |  |  | Weighted- Average Exercise Price Per Share |  |  | Weighted- Average Remaining Contractual Term (in years) |  |  | Aggregate Intrinsic Value |
Options outstanding at January 1, 2014 |  |  | 1,610,988 |  |  | $ | 5.07 |  |  |  |  |  |  |  |  |
Granted |  |  | 339,698 |  |  |  | 12.37 |  |  |  |  |  |  |  |  |
Exercised |  |  | (573,238 | ) |  |  | 4.36 |  |  |  |  |  |  |  |  |
Forfeited/Cancelled |  |  | (64,707 | ) |  |  | 6.92 |  |  |  |  |  |  |  |  |
Options outstanding at June 30, 2014 |  |  | 1,312,741 |  |  | $ | 7.19 |  |  |  | 7.63 |  |  | $ | 20,475,525 |
Options exercisable at June 30, 2014 |  |  | 419,600 |  |  | $ | 4.05 |  |  |  | 5.11 |  |  | $ | 7,862,172 |
Vested and expected to vest at June 30, 2014 (1) |  |  | 1,211,138 |  |  | $ | 7.09 |  |  |  | 7.56 |  |  | $ | 19,013,813 |

(1) | This represents the number of vested options as of June 30, 2014 plus the number of unvested options expected to vest as of June 30, 2014 based on the unvested outstanding options at June 30, 2014 adjusted for estimated forfeiture rates of 8% for awards granted to non-executive level employees and 3% for awards granted to executive level employees.

The aggregate intrinsic value in the table above represents the total pre-tax intrinsic value (the difference between the closing price of the common stock on June 30, 2014 of $22.79 and the exercise price of each in-the-money option) that would have been received by the option holders had all option holders exercised their options on June 30, 2014.

The weighted average grant date fair value of options granted during the six months ended June 30, 2014 and 2013 was $10.85 and $3.84, respectively. The total fair value of stock options that vested during the six months ended June 30, 2014 and 2013 was approximately $646,322 and $695,795, respectively.

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As of June 30, 2014, there was $4,328,098 of total unrecognized compensation cost related to unvested share-based awards. This cost is expected to be recognized over a weighted average remaining requisite service period of 3.16 years. The Company expects 791,538 unvested options to vest over the next five years.

7. | Cash, Cash Equivalents and Marketable Securities

At June 30, 2014 and December 31, 2013, the Company’s investments included money market funds as well as short-term and long-term marketable securities. These marketable securities are classified as available-for-sale. Marketable securities are investments with original maturities of greater than 90 days. Long-term marketable securities are securities with maturities of greater than one year. The average remaining contractual maturity of marketable securities at June 30, 2014 is approximately 10.29 months.

Management reviewed the Company’s investments as of June 30, 2014 and December 31, 2013 and concluded that there are no securities with other than temporary impairments in the investment portfolio. The Company does not intend to sell any investments in an unrealized loss position and it is not more likely than not that the Company will be required to sell the investments before recovery of their amortized cost bases.

Investments in money market funds and marketable securities consisted of the following at June 30, 2014:

|  | June 30, 2014 |
|  | Amortized Cost |  |  | Gross Unrealized Gain |  |  | Gross Unrealized Loss |  |  | Fair Value |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government and agency securities |  | $ | 7,286,273 |  |  | $ | 2,220 |  |  | $ | (119 | ) |  | $ | 7,288,374 |
Corporate and other debt securities |  |  | 8,980,820 |  |  |  | 2,053 |  |  |  | (730 | ) |  |  | 8,982,143 |
|  |  | 16,267,093 |  |  |  | 4,273 |  |  |  | (849 | ) |  |  | 16,270,517 |
Long-term marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government and agency securities |  |  | 7,365,077 |  |  |  | 3,144 |  |  |  | (888 | ) |  |  | 7,367,333 |
Corporate and other debt securities |  |  | 4,529,989 |  |  |  | 1,847 |  |  |  | (2,220 | ) |  |  | 4,529,616 |
|  |  | 11,895,066 |  |  |  | 4,991 |  |  |  | (3,108 | ) |  |  | 11,896,949 |
Total |  | $ | 28,162,159 |  |  | $ | 9,264 |  |  | $ | (3,957 | ) |  | $ | 28,167,466 |

At June 30, 2014, the Company’s investments included twenty-two securities in unrealized loss positions with a total unrealized loss of approximately $4,000 and a total fair market value of approximately $8,742,000. All investments with gross unrealized losses have been in unrealized loss positions for less than 12 months. The unrealized losses were caused primarily by current economic and market conditions. There was no change in the credit risk of the securities. There were no realized gains or losses on the investments for the six months ended June 30, 2014 or the year ended December 31, 2013.

Investments in money market funds and marketable securities consisted of the following at December 31, 2013:

|  | December 31, 2013 |
|  | Amortized Cost |  |  | Gross Unrealized Gain |  |  | Gross Unrealized Loss |  |  | Fair Value |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government and agency securities |  | $ | 8,165,464 |  |  | $ | 435 |  |  | $ | (630 | ) |  | $ | 8,165,269 |
Corporate and other debt securities |  |  | 13,626,690 |  |  |  | 3,636 |  |  |  | (2,045 | ) |  |  | 13,628,281 |
|  |  | 21,792,154 |  |  |  | 4,071 |  |  |  | (2,675 | ) |  |  | 21,793,550 |
Long-term marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government and agency securities |  |  | 11,599,415 |  |  |  | 466 |  |  |  | (7,034 | ) |  |  | 11,592,847 |
Corporate and other debt securities |  |  | 625,882 |  |  |  | 100 |  |  |  | (227 | ) |  |  | 625,755 |
|  |  | 12,225,297 |  |  |  | 566 |  |  |  | (7,261 | ) |  |  | 12,218,602 |
Total |  | $ | 34,017,451 |  |  | $ | 4,637 |  |  | $ | (9,936 | ) |  | $ | 34,012,152 |

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The contractual maturities of money market funds and marketable securities at June 30, 2014 were as follows:

|  | Amortized Cost |  |  | Fair Value |
Due in 1 year or less |  | $ | 16,267,093 |  |  | $ | 16,270,517 |
Due in 1 to 2 years |  |  | 11,895,066 |  |  |  | 11,896,949 |
|  | $ | 28,162,159 |  |  | $ | 28,167,466 |

8. | Fair Value Measurement

In determining the fair value of its assets and liabilities, the Company uses various valuation approaches. The Company employs a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that observable inputs be used when available. Observable inputs are inputs that market participants would use in pricing the asset or liability based on market data obtained from sources independent of the Company. Unobservable inputs are inputs that reflect the Company’s assumptions about the inputs that market participants would use in pricing the asset or liability and are developed based on the best information available in the circumstances. The fair value hierarchy is broken down into three levels based on the source of inputs as follows:

Level 1 |  | – |  | Valuations based on unadjusted quoted prices in active markets for identical assets or liabilities that the Company has the ability to access
Level 2 |  | – |  | Valuations based on quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active and models for which all significant inputs are observable, either directly or indirectly
Level 3 |  | – |  | Valuations based on inputs that are unobservable and significant to the overall fair value measurement

The availability of observable inputs can vary among the various types of financial assets and liabilities. To the extent that the valuation is based on models or inputs that are less observable or unobservable in the market, the determination of fair value requires more judgment. In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, for financial statement disclosure purposes, the level in the fair value hierarchy within which the fair value measurement is categorized is based on the lowest level input that is significant to the overall fair value measurement.

The Company’s fixed income investments are comprised of obligations of U.S. government agencies and corporate marketable securities. These investments have been initially valued at the transaction price and subsequently valued, at the end of each reporting period, utilizing third party pricing services or other market observable data. The pricing services utilize industry standard valuation models, including both income and market based approaches and observable market inputs to determine value. These observable market inputs include reportable trades, benchmark yields, credit spreads, broker/dealer quotes, bids, offers, current spot rates and other industry and economic events. At least annually, the Company validates the prices provided by third party pricing services by reviewing their pricing methods and matrices, obtaining market values from other pricing sources, analyzing pricing data in certain instances and confirming that the relevant markets are active. The Company did not adjust or override any fair value measurements provided by the pricing services as of June 30, 2014.

The following fair value hierarchy table presents information about each major category of the Company’s assets measured at fair value on a recurring basis as of June 30, 2014:

|  | Fair value measurement at reporting date using: |
|  | Quoted prices in active markets for identical assets (Level 1) |  |  | Significant other observable inputs (Level 2) |  |  | Significant unobservable inputs (Level 3) |  |  | Total |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 4,156,618 |  |  | $ | — |  |  | $ | — |  |  | $ | 4,156,618 |
U.S. Government and agency securities |  |  | 12,173,069 |  |  |  | 2,482,638 |  |  |  | — |  |  |  | 14,655,707 |
Corporate and other debt securities |  |  | — |  |  |  | 13,511,759 |  |  |  | — |  |  |  | 13,511,759 |
Total |  | $ | 16,329,687 |  |  | $ | 15,994,397 |  |  | $ | — |  |  | $ | 32,324,084 |

The Company has no other assets or liabilities for which fair value measurement is either required or has been elected to be applied, other than the liabilities for contingent consideration recorded in connection with the Novozymes Acquisition, the acquisition of the assets of BioFlash Partners, LLC (“BioFlash”) and the acquisition of the assets of Refine Technology, LLC (“Refine”). The contingent consideration related to Novozymes is based upon actual amounts remaining to be paid to Novozymes Denmark per the Deed of

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Settlement and Amendment entered into on May 5, 2014. The contingent consideration related to BioFlash is valued using management’s estimates of royalties to be paid to the former shareholders of BioFlash based on sales of the acquired assets. The contingent consideration related to Refine is valued using management’s estimates of expected future milestone payments based on forecasted sales of the acquired assets and portion of any receipts that might be received in connection with the resolution, withdrawal or settlement of certain patent disputes with a third party to be paid to the former shareholders of Refine. These valuations are Level 3 valuations as the primary inputs are unobservable. Changes in the fair value of contingent consideration in the three and six-month periods ended June 30, 2014 are primarily attributable to a 750,000 Euro milestone payment made to Novozymes Denmark and a $80,000 minimum royalty payment made to BioFlash, which were previously accrued, and the addition of the $1,400,000 contingent consideration related to Refine. The following table provides a roll forward of the fair value of the contingent consideration:

Balance at December 31, 2013 |  | $ | 1,648,928 |
Additions |  |  | 1,400,000 |
Payments |  |  | (1,110,219 | )
Changes in fair value |  |  | 103,124 |
Balance at June 30, 2014 |  | $ | 2,041,833 |

There were no remeasurements to fair value during the three or six months ended June 30, 2014 of financial assets and liabilities that are not measured at fair value on a recurring basis.

9. | Inventories

Inventories relate to the Company’s bioprocessing business and also include inventory acquired as part of the Refine acquisition. The Company values inventory at cost or, if lower, fair market value, using the first-in, first-out method. The Company reviews its inventories at least quarterly and records a provision for excess and obsolete inventory based on its estimates of expected sales volume, production capacity and expiration dates of raw materials, work-in process and finished products. Expected sales volumes are determined based on supply forecasts provided by key customers for the next three to 12 months. The Company writes down inventory that has become obsolete, inventory that has a cost basis in excess of its expected net realizable value, and inventory in excess of expected requirements to cost of product revenue. Manufacturing of bioprocessing finished goods is done to order and tested for quality specifications prior to shipment. Reserves for excess and obsolete inventory were approximately $182,000 at June 30, 2014 and $183,000 at December 31, 2013.

A change in the estimated timing or amount of demand for the Company’s products could result in additional provisions for excess inventory quantities on hand. Any significant unanticipated changes in demand or unexpected quality failures could have a significant impact on the value of inventory and reported operating results. During all periods presented in the accompanying financial statements, there have been no material adjustments related to a revised estimate of inventory valuations.

Work-in-process and finished products inventories consist of material, labor, outside processing costs and manufacturing overhead. Inventories consist of the following:

|  | June 30, 2014 |  |  | December 31, 2013 |
Raw materials |  | $ | 5,175,278 |  |  | $ | 4,557,870 |
Work-in-process |  |  | 3,051,182 |  |  |  | 4,285,648 |
Finished products |  |  | 4,597,137 |  |  |  | 2,955,120 |
Total |  | $ | 12,823,597 |  |  | $ | 11,798,638 |

10. | Accrued Liabilities

The Company estimates accrued liabilities by identifying services performed on the Company’s behalf, estimating the level of service performed and determining the associated cost incurred for such service as of each balance sheet date. For example, the Company would accrue for professional and consulting fees incurred with law firms, audit and accounting service providers and other third party consultants. These expenses are determined by either requesting those service providers to estimate unbilled services at each reporting date for services incurred or tracking costs incurred by service providers under fixed fee arrangements.

The Company has processes in place to estimate the appropriate amounts to record for accrued liabilities, which principally involve the applicable personnel reviewing the services provided. In the event that the Company does not identify certain costs that have begun to be incurred or the Company under or over-estimates the level of services performed or the costs of such services, the reported expenses for that period may be too low or too high. The date on which certain services commence, the level of services performed on or before a given date, and the cost of such services often require the exercise of judgment. The Company makes these judgments based upon the facts and circumstances known at the date of the financial statements.

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Accrued liabilities consist of the following:

|  | June 30, 2014 |  |  | December 31, 2013 |
Employee compensation |  | $ | 2,596,382 |  |  | $ | 3,166,086 |
Taxes |  |  | 952,733 |  |  |  | 2,324,711 |
Contingent consideration (current portion) |  |  | 377,177 |  |  |  | 1,195,248 |
Professional fees |  |  | 183,876 |  |  |  | 385,478 |
Unearned revenue |  |  | 141,481 |  |  |  | 3,341 |
Royalty and license fees |  |  | 7,262 |  |  |  | 1,897,473 |
VAT liabilities |  |  | — |  |  |  | 7,591 |
Other accrued expenses |  |  | 660,768 |  |  |  | 599,784 |
Total |  |  | 4,919,679 |  |  |  | 9,579,712 |

11. | Commitments and Contingencies

In March 2014, the Company entered into an amendment of its existing lease to expand the rented space from 55,694 to 75,594 square feet at 41 Seyon Street, Waltham, Massachusetts. Pursuant to the terms of the amended lease, Repligen will lease an additional 19,900 square feet (the “Expansion Space”) for a period of eight years and one month, commencing on August 1, 2014 or the date upon which the landlord’s improvements to the Expansion Space have been completed, whichever is later. The Expansion Space shall become a part of Repligen’s corporate headquarters.

The amended lease provides for additional rent expense of approximately $361,000 on an annualized basis. The amended lease also requires an increased security deposit from $200,000 to $450,000 and continues to require the Company to pay a proportionate share of certain of the landlord’s annual operating costs and real estate taxes. Future minimum rental commitments under the amended lease as of June 30, 2014 are approximately $655,000 and $1,371,000 for the remainder of the year ending December 31, 2014, and the years ending December 31, 2015, 2016, 2017 and 2018, respectively.

12. | Income Taxes

For the three and six-month periods ended June 30, 2014, the Company had income before taxes of $3,243,249 and $8,641,354, respectively. The Company recorded income tax provisions of $417,827 and $1,538,829, respectively, for the three and six-month periods ended June 30, 2014. This is based on a year to date effective tax rate of 17.8% for the six-month period ended June 30,2014 and an expected effective tax rate of 24.23% for the year ending December 31, 2014. The anticipated movement in the effective tax rate between the interim period and year end is a result of the expected change in the income position in the US. The effective income tax rate is based upon the estimated income for the year and the composition of the income in different jurisdictions. The effective tax rate differs from the U.S. statutory tax rate primarily due to the lower statutory tax rate in Sweden, as well as year-to-date income for the U.S. entity as compared to a projected loss in the U.S. for the full year.

For the three and six-month periods ended June 30, 2013, the Company had income before taxes of $6,033,703 and $9,655,771, respectively. The Company recorded income tax provisions of $1,494,516 and $2,778,348, respectively, for the three and six-month periods ended June 30, 2013. This was based on an expected effective tax rate of 25.69% for the year ending December 31, 2013 plus approximately $298,000 of discrete items recognized in the quarter ended March 31, 2013. The effective income tax rate is based upon the estimated income for the year and the composition of the income in different jurisdictions. The effective tax rate differs from the U.S. statutory tax rate primarily due to the lower statutory tax rate in Sweden.

The Company has net operating loss carryforwards of approximately $37,633,000 and business tax credits carryforwards of approximately $1,520,000 available to reduce future federal income taxes, if any. The net operating loss and business tax credits carryforwards will continue to expire at various dates through December 2031. Net operating loss carryforwards and available tax credits are subject to review and possible adjustment by the Internal Revenue Service and may be limited in the event of certain changes in the ownership interest of significant stockholders.

In the fourth quarter of 2012, we entered into a cumulative pre-tax income position and concluded that it was more likely than not that we would generate sufficient taxable income in 2013 based on our 2013 projections to realize the tax benefit of a portion of our deferred tax assets. We accordingly recorded a tax benefit in the fourth quarter of 2012 that included the reversal of $3,021,000 of the valuation allowance on our deferred tax assets. At December 31, 2013, as a result of the fact that we no longer receive royalty payments on Bristol’s sales of Orencia, we concluded that realization of deferred tax assets beyond December 31, 2013 was not more

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likely than not and we therefore maintained a valuation allowance against the majority of our remaining deferred tax assets. As of June 30, 2014, we continue to maintain a valuation allowance against the majority of our remaining deferred tax assets as we concluded that realization of deferred tax assets for the year ended December 31, 2014 and beyond was not more likely than not.

13. | Segment Reporting

The Company views its operations, makes decisions regarding how to allocate resources and manages its business as one operating segment. As a result, the financial information disclosed herein represents all of the material financial information related to the Company’s principal operating segment.

The following table represents the Company’s total revenue by geographic area (based on the location of the customer):

|  | Three months ended June 30, |  |  | Six months ended June 30, |
|  | 2014 |  |  | 2013 |  |  | 2014 |  |  | 2013 |
Sweden |  |  | 48 | % |  |  | 39 | % |  |  | 44 | % |  |  | 39 | %
United States |  |  | 23 | % |  |  | 46 | % |  |  | 32 | % |  |  | 47 | %
United Kingdom |  |  | 25 | % |  |  | 13 | % |  |  | 21 | % |  |  | 12 | %
Other |  |  | 4 | % |  |  | 2 | % |  |  | 3 | % |  |  | 2 | %
Total |  |  | 100 | % |  |  | 100 | % |  |  | 100 | % |  |  | 100 | %

Revenue from significant customers as a percentage of the Company’s total revenue is as follows:

|  | Three months ended June 30, |  |  | Six months ended June 30, |
|  | 2014 |  |  | 2013 |  |  | 2014 |  |  | 2013 |
Orencia® Royalties from Bristol |  |  | — |  |  |  | 25 | % |  |  | — |  |  |  | 24 | %
Bioprocessing Customer A |  |  | 48 | % |  |  | 39 | % |  |  | 44 | % |  |  | 38 | %
Bioprocessing Customer B |  |  | 22 | % |  |  | 15 | % |  |  | 22 | % |  |  | 14 | %
Bioprocessing Customer C |  |  | 14 | % |  |  | 10 | % |  |  | 14 | % |  |  | 13 | %

Significant accounts receivable balances as a percentage of the Company’s total trade accounts receivable and royalties and other receivables balances are as follows:

|  | June 30, 2014 |  |  | December 31, 2013 |
Orencia® Royalties from Bristol |  |  | — |  |  |  | 42 | %
Bioprocessing Customer A |  |  | 33 | % |  |  | 17 | %
Bioprocessing Customer B |  |  | 18 | % |  |  | 8 | %
Tenant improvement allowance due from landlord |  |  | — |  |  |  | 15 | %

14. | New Accounting Pronouncements

In May 2014, the FASB issued ASU No. 2014-09, which amends the guidance for accounting for revenue from contracts with customers. This ASU supersedes the revenue recognition requirements in Accounting Standards Codification Topic 605, Revenue Recognition, and creates a new Topic 606, Revenue from Contracts with Customers. This guidance is effective for fiscal years beginning after December 15, 2016, with early adoption not permitted. Two adoption methods are permitted: retrospectively to all prior reporting periods presented, with certain practical expedients permitted; or retrospectively with the cumulative effect of initially adopting the ASU recognized at the date of initial application. The Company has not yet determined which adoption method it will utilize or the effect that the adoption of this guidance will have on its consolidated financial statements.

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ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Overview

We are a life sciences company that develops, manufactures and markets high-value, consumable bioprocessing products for life sciences companies and biopharmaceutical manufacturing companies worldwide. We are a world-leading manufacturer of both native and recombinant forms of Protein A, critical reagents used in biomanufacturing to separate and purify monoclonal antibodies, a type of biologic drug. We also supply several growth factor products used to increase cell culture productivity during the biomanufacturing process. In the expanding area of flexible biomanufacturing technologies, we have developed and currently market a series of OPUS (Open-Platform, User-Specified) chromatography columns for use in clinical-scale manufacturing. We generally manufacture and sell Protein A and growth factors to life sciences companies under long-term supply agreements and sell our chromatography columns, as well as media and quality test kits, directly to biopharmaceutical companies or contract manufacturing organizations. We refer to these activities as our bioprocessing business. Our manufacturing facilities are located in the United States and Sweden.

On June 2, 2014, we acquired certain assets and assumed certain liabilities of Refine Technology, LLC (“Refine”), including Refine’s Alternating Tangential Flow (“ATF”) System, a market-leading device used to significantly increase product yield during the fermentation step of the biologic drug manufacturing process (the “Refine Business” and the acquisition of the Refine Business, the “Refine Acquisition”) for total upfront consideration of approximately $25.2 million. The acquisition strengthens Repligen’s bioprocessing business by adding a complementary product line while expanding our direct sales presence worldwide.

Historically, Repligen also conducted activities aimed at developing proprietary therapeutic drug candidates, often with a potential of entering into a collaboration with a larger commercial stage pharmaceutical or biotechnology company in respect of these programs. In addition, we out-licensed certain intellectual property to Bristol-Myers Squibb Company, or Bristol, from which we received royalties on Bristol’s net sales in the United States of their product Orencia®. These royalty payments from Bristol ceased on December 31, 2013. As part of our strategic decision in 2012 to focus our efforts on our core bioprocessing business, we reduced our efforts on our clinical development programs and increased our efforts to find collaboration partners to pursue the development and, if successful, the commercialization of these drug programs. The current status of our therapeutic drug development portfolio is:

| • |  | On January 21, 2014, we entered into an asset purchase agreement (the “Asset Purchase Agreement”) with BioMarin Pharmaceutical Inc. (“BioMarin”) to advance Repligen’s histone deacetylase inhibitor (HDACi) portfolio. Pursuant to the terms of the Asset Purchase Agreement, we received $2 million from BioMarin as an upfront payment on January 30, 2014. The Company is entitled to receive up to $160 million in potential future milestone payments for the development, regulatory approval and commercial sale of portfolio compounds included in the agreement. In addition, Repligen is eligible to receive royalties on sales of therapeutic products originating from the HDACi portfolio.

| • |  | On December 28, 2012, we out-licensed our spinal muscular atrophy program, or SMA program, led by RG3039, a small molecule drug candidate in clinical development for SMA, to Pfizer Inc., or Pfizer. Pursuant to the license agreement, Pfizer assumed the majority of the costs associated with completing the required clinical trials for this program as well as obtaining U.S. Food and Drug Administration (“FDA”) approval of the respective new drug application (“NDA”). Under the license agreement, we were obligated to conduct additional activities in support of this program, which included completing the second cohort of the initial Phase I trial for RG3039 and supporting the transition of the program to Pfizer. We completed all of our obligations under the license agreement in 2013.

| • |  | Our clinical development portfolio also includes RG1068, a synthetic human hormone developed as a novel imaging agent for the improved detection of pancreatic duct abnormalities in combination with magnetic resonance imaging in patients with pancreatitis and potentially other pancreatic diseases. We submitted an NDA to the FDA and a marketing authorization application to the European Medicines Agency in the first quarter of 2012. In the second quarter of 2012, we received a complete response letter from the FDA, indicating the need for additional clinical efficacy and safety trial data. We have also received from the FDA the requirements for an additional registration study. We believe this information may be a factor in the decision by third-parties that may wish to pursue a development or commercialization agreement with us for RG1068. We expect that any additional development activities in the future will be supported by sponsors or other third parties.

Critical Accounting Policies and Estimates

A “critical accounting policy” is one which is both important to the portrayal of the Company’s financial condition and results and requires management’s most difficult, subjective or complex judgments, often as a result of the need to make estimates about the effect of matters that are inherently uncertain. For additional information, please see the discussion of our critical accounting policies in Management’s Discussion and Analysis and our significant accounting policies in Note 2 to the Financial Statements included in our Annual Report on Form 10-K for the year ended December 31, 2013. There have been no changes to our critical accounting policies since December 31, 2013, other than updating our revenue recognition policy.

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Results of Operations

Three months ended June 30, 2014 vs. June 30, 2013

Revenues

Total revenues for the three-month periods ended June 30, 2014 and 2013 were comprised of the following:

|  | Three months ended June 30, |  |  | % Change |
|  | 2014 |  |  | 2013 |  |  | 2014 vs. 2013 |
|  | (in thousands, except percentages) |
Product revenue |  | $ | 15,551 |  |  | $ | 13,014 |  |  |  | 19 | %
Royalty and other revenue |  |  | — |  |  |  | 4,495 |  |  |  | -100 | %
Total revenue |  | $ | 15,551 |  |  | $ | 17,509 |  |  |  | -11 | %

Sales of bioprocessing products for the three months ended June 30, 2014 and 2013 were $15,551,000 and $13,014,000, respectively, an increase of $2,537,000, or 19%. This increase was primarily due to increases in orders from our key bioprocessing customers and the addition of the Refine Business. Sales of our bioprocessing products can be impacted by the timing of orders, development efforts at our customers or end-users and regulatory approvals for biologics that incorporate our products, which may result in significant quarterly fluctuations. Such quarterly fluctuations are expected, but they may not be predictive of future revenue or otherwise indicate a trend.

Pursuant to the settlement with Bristol, we recognized royalty revenue of $4,285,000 for the three months ended June 30, 2013. Our royalty agreement with Bristol provided that we would receive such royalty payments on sales of Orencia® by Bristol through December 31, 2013. These royalty payments have ceased.

For the three months ended June 30, 2013, we recognized $142,000 of revenue from a sponsored research and development project under an agreement with the National Institutes of Health / Scripps Research Institute.

We also recognized $68,000 of revenue from the upfront payment under the Pfizer License Agreement in the three months ended June 30, 2013.

Costs and operating expenses

Total costs and operating expenses for the three-month periods ended June 30, 2014 and 2013 were comprised of the following:

|  | Three months ended June 30, |  |  | % Change |
|  | 2014 |  |  | 2013 |  |  | 2014 vs. 2013 |
|  | (in thousands, except percentages) |
Cost of product revenue |  | $ | 6,672 |  |  | $ | 5,298 |  |  |  | 26 | %
Cost of royalty revenue |  |  | — |  |  |  | 643 |  |  |  | -100 | %
Research and development |  |  | 1,430 |  |  |  | 2,306 |  |  |  | -38 | %
Selling, general and administrative |  |  | 4,325 |  |  |  | 3,124 |  |  |  | 38 | %
Contingent consideration – fair value adjustments |  |  | 18 |  |  |  | 35 |  |  |  | -49 | %
Total costs and operating expenses |  | $ | 12,445 |  |  | $ | 11,406 |  |  |  | 9 | %

Cost of product revenue was approximately $6,672,000 and $5,298,000 for the three-month periods ended June 30, 2014 and 2013, respectively, an increase of $1,374,000 or 26%. This increase is primarily due to the increased product revenue noted above and the addition of the Refine Business. Gross margins may decline over the remainder of the 2014 based on expected production volume and shipments, and product mix.

Pursuant to the settlement with Bristol, we remitted 15% of royalty revenue received through the expiration of the settlement agreement in December 2013 to the University of Michigan. For the three-month period ended June 30, 2013 this cost of royalty revenue was approximately $643,000.

Research and development expenses were approximately $1,430,000 and $2,306,000 for the three-month periods ended June 30, 2014 and 2013, respectively, a decrease of $876,000 or 38%. This decrease is directly related to our decision in 2012 to exit therapeutic drug development and is partially offset by an increase in bioprocessing research and development expense. For the three-month periods ended June 30, 2014 and 2013, approximately $1,430,000 and $1,220,000, respectively, of our total research and development

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expenses were incurred on bioprocessing research and development activities. For each of the remaining quarters in 2014, we expect similar levels of research and development expenses, which relate primarily to bioprocessing product development, to those incurred in the quarter ended June 30, 2014.

Selling, general and administrative expenses were approximately $4,325,000 and $3,124,000 for the three-month periods ended June 30, 2014 and 2013, respectively, an increase of $1,201,000 or 38%. This increase is primarily attributable to Refine acquisition costs of approximately $314,000 and higher employee related expenses of approximately $330,000. For each of the remaining quarters in 2014, we expect similar levels of selling, general and administrative expenses to those incurred in the quarter ended June 30, 2014 as we look to expand our customer-facing activities to drive sales of our bioprocessing products.

Investment income

Investment income includes income earned on invested cash balances. Investment income was approximately $85,000 and $66,000 for the three-month periods ended June 30, 2014 and 2013, respectively. This increase of $19,000, or 29%, is primarily attributable to higher average invested cash balances.

Other income (expense)

Other income (expense) was approximately $65,000 and ($122,000) for the three-month periods ended June 30, 2014 and 2013, respectively, and was primarily attributable to foreign currency gains related to our Sweden operations.

Provision for income taxes

For the three months ended June 30, 2014, we had income before taxes of approximately $3,243,000 and recorded a tax provision of approximately $418,000 for an effective tax rate of approximately 12.9%. This is based on an expected effective tax rate of 24.23% for the year ending December 31, 2014. The effective income tax rate is based upon the estimated income for the year and the composition of the income in different jurisdictions. The effective tax rate differs from the U.S. statutory tax rate primarily due to the lower statutory tax rate in Sweden.

Six months ended June 30, 2014 vs. June 30, 2013

Revenues

Total revenues for the six-month periods ended June 30, 2014 and 2013 were comprised of the following:

|  | Six months ended June 30, |  |  | % Change |
|  | 2014 |  |  | 2013 |  |  | 2014 vs. 2013 |
|  | (in thousands, except percentages) |
Product revenue |  | $ | 29,886 |  |  | $ | 24,948 |  |  |  | 20 | %
Royalty and other revenue |  |  | 1,991 |  |  |  | 9,017 |  |  |  | -78 | %
Total revenue |  | $ | 31,877 |  |  | $ | 33,965 |  |  |  | -6 | %

Sales of bioprocessing products for the six-month periods ended June 30, 2014 and 2013 were $29,886,000 and $24,948,000, respectively, an increase of $4,938,000, or 20%. This increase was primarily due to increases in orders from our key bioprocessing customers and the addition of the Refine Business. Sales of our bioprocessing products can be impacted by the timing of orders, development efforts at our customers or end-users and regulatory approvals for biologics that incorporate our products, which may result in significant quarterly fluctuations. Such quarterly fluctuations are expected, but they may not be predictive of future revenue or otherwise indicate a trend.

In the six months ended June 30, 2014, we recognized $2 million of revenue under the Asset Purchase Agreement with BioMarin Pharmaceutical Inc. (“BioMarin”) to advance Repligen’s histone deacetylase inhibitor (HDACi) portfolio.

Pursuant to the settlement with Bristol, we recognized royalty revenue of $8,131,000 for the six months ended June 30, 2013. Our royalty agreement with Bristol provided that we would receive such royalty payments on sales of Orencia® by Bristol through December 31, 2013. These royalty payments have ceased.

For the six months ended June 30, 2013, we recognized $763,000 of revenue from a sponsored research and development project under an agreement with the National Institutes of Health / Scripps Research Institute.

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We recognized $124,000 of revenue from the upfront payment under the Pfizer License Agreement in the six months ended June 30, 2013.

Costs and operating expenses

Total costs and operating expenses for the six-month periods ended June 30, 2014 and 2013 were comprised of the following:

|  | Six months ended June 30, |  |  | % Change |
|  | 2014 |  |  | 2013 |  |  | 2014 vs. 2013 |
|  | (in thousands, except percentages) |
Cost of product revenue |  | $ | 13,007 |  |  | $ | 12,194 |  |  |  | 7 | %
Cost of royalty revenue |  |  | — |  |  |  | 1,220 |  |  |  | -100 | %
Research and development |  |  | 2,631 |  |  |  | 4,490 |  |  |  | -41 | %
Selling, general and administrative |  |  | 7,709 |  |  |  | 6,432 |  |  |  | 20 | %
Contingent consideration – fair value adjustments |  |  | 116 |  |  |  | (19 | ) |  |  | 711 | %
Total costs and operating expenses |  | $ | 23,463 |  |  | $ | 24,317 |  |  |  | -4 | %

Cost of product revenue was approximately $13,007,000 and $12,194,000 for the six-month periods ended June 30, 2014 and 2013, respectively, an increase of $813,000 or 7%. This increase is primarily due to the increased product revenue noted above and the addition of the Refine Business. Gross margins may decline over the remainder of the 2014 based on expected production volume and shipments, and product mix.

Pursuant to the settlement with Bristol, we remitted 15% of royalty revenue received through the expiration of the settlement agreement in December 2013 to the University of Michigan. For the six-month period ended June 30, 2013, this cost of royalty revenue was approximately $1,220,000.

Research and development expenses were approximately $2,631,000 and $4,490,000 for the six-month periods ended June 30, 2014 and 2013, respectively, a decrease of $1,859,000 or 41%. This decrease is directly related to our decision in 2012 to exit therapeutic drug development and is partially offset by an increase in bioprocessing research and development expense. For the six-month periods ended June 30, 2014 and 2013, approximately $2,631,000 and $2,300,000, respectively, of our total research and development expenses were incurred on bioprocessing research and development activities. For the remaining half of 2014, we expect similar levels of research and development expenses, which relate primarily to bioprocessing product development, to those incurred in the first half of 2014.

Selling, general and administrative expenses were approximately $7,709,000 and $6,432,000 for the six-month periods ended June 30, 2014 and 2013, respectively, an increase of $1,277,000 or 20%. This increase is primarily attributable to Refine acquisition costs of approximately $474,000 and higher sales and marketing expenses of approximately $290,000. For the remaining half of 2014, we expect similar levels of selling, general and administrative expenses to those incurred in the first half of 2014 as we look to expand our customer-facing activities to drive sales of our bioprocessing products.

Investment income

Investment income includes income earned on invested cash balances. Investment income was approximately $187,000 and $127,000 for the six-month periods ended June 30, 2014 and 2013, respectively. This increase of $60,000, or 47%, is primarily attributable to higher average invested cash balances.

Other income (expense)

Other income (expense) was approximately $68,000 and ($93,000) for the six-month periods ended June 30, 2014 and 2013, respectively, and was primarily attributable to foreign currency gains related to our Sweden operations.

Provision for income taxes

For the six months ended June 30, 2014, we had income before taxes of approximately $8,641,000 and recorded a tax provision of approximately $1,539,000 for an effective tax rate of approximately 17.8%. This is based on an expected effective tax rate of 24.23% for the year ending December 31, 2014. The effective income tax rate is based upon the estimated income for the year and the composition of the income in different jurisdictions. The effective tax rate differs from the U.S. statutory tax rate primarily due to the lower statutory tax rate in Sweden.

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Liquidity and capital resources

We have financed our operations primarily through sales of equity securities, revenues derived from product sales, research grants, and license arrangements, as well as proceeds and royalties from a litigation settlement. Our revenue for the foreseeable future will primarily be limited to our bioprocessing product revenue.

At June 30, 2014, we had cash and marketable securities of $61,923,000 compared to $73,842,000 at December 31, 2013. A deposit for leased office space of $450,000 and $200,000 is classified as restricted cash and is not included in cash and marketable securities totals for June 30, 2014 or December 31, 2013, respectively.

Operating activities

For the six-month period ended June 30, 2014, our operating activities provided cash of $10,320,000 reflecting net income of $7,103,000 and non-cash charges totaling $2,945,000 including depreciation, amortization, stock-based compensation charges and deferred tax expense. The remaining cash flow provided by operations resulted from favorable changes in various working capital accounts, in particular the collection of the final Orencia royalty from Bristol Myers of $4.9 million and the tenant improvement allowance of $1.8 million from our landlord.

For the six-month period ended June 30, 2013, our operating activities provided cash of $12,391,000 reflecting net income of $6,877,000 and non-cash charges totaling $3,065,000 including depreciation, amortization, stock-based compensation charges and deferred tax expense. The remaining cash flow provided by operations resulted from favorable changes in various working capital accounts, in particular the collection of $5 million due from Pfizer pursuant to our collaboration agreement.

Investing activities

We place our marketable security investments in high quality credit instruments as specified in our investment policy guidelines. Our investing activities consumed $16,853,000 for the six-month period ended June 30, 2014, primarily due to the Refine Acquisition, fixed asset additions and an increase in restricted cash, partially offset by net redemptions of marketable debt securities. For the six-month period ended June 30, 2013, our investing activities consumed $5,811,000, primarily due to net purchases of marketable debt securities as well as $1,105,000 used for fixed asset additions.

Financing activities

Exercises of stock options provided cash receipts of $1,338,000 and $2,035,000 in the six-month periods ended June 30, 2014 and 2013, respectively.

We do not currently use derivative financial instruments.

Working capital decreased by approximately $10,007,000 to $65,042,000 at June 30, 2014 from $75,049,000 at December 31, 2013 due to the various changes noted above.

Our future capital requirements will depend on many factors, including the following:

| • |  | the expansion of our bioprocessing business;

| • |  | the ability to sustain sales and profits of our bioprocessing products;

| • |  | the ability to replace the Orencia royalty revenue that we ceased receiving at the end of 2013;

| • |  | the scope of and progress made in our research and development activities;

| • |  | our ability to acquire additional bioprocessing products;

| • |  | the extent of any share repurchase activity; and

| • |  | the success of any proposed financing efforts.

Absent acquisitions of additional products, product candidates or intellectual property, we believe our current cash balances are adequate to meet our cash needs for at least the next 24 months. We expect to incur continued spending related to the development and expansion of our bioprocessing product lines for the foreseeable future. Our future capital requirements may include, but are not limited to, purchases of property, plant and equipment, the acquisition of additional bioprocessing products and technologies to complement our existing manufacturing capabilities, and continued investment in our intellectual property portfolio.

We plan to continue to invest in our bioprocessing business and in key research and development activities associated with our efforts to identify and consummate development and commercialization partnerships. We actively evaluate various strategic transactions on an ongoing basis, including monetizing existing assets and licensing or acquiring complementary products, technologies or businesses that would complement our existing portfolio of development programs. We continue to seek to acquire such potential assets that may

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offer us the best opportunity to create value for our shareholders. In order to acquire such assets, we may need to seek additional financing to fund these investments. This may require the issuance or sale of additional equity or debt securities. The sale of additional equity may result in additional dilution to our stockholders. Should we need to secure additional financing to acquire a product, fund future investment in research and development, or meet our future liquidity requirements, we may not be able to secure such financing, or obtain such financing on favorable terms because of the volatile nature of the biotechnology marketplace.

Off-Balance Sheet Arrangements

We do not have any special purpose entities or off-balance sheet financing arrangements as of June 30, 2014.

Contractual obligations

As of June 30, 2014, we had the following fixed obligations and commitments:

|  | Payments Due by Period |
(In thousands) |  | Total |  |  | Less than 1 Year |  |  | 1 - 3 Years |  |  | 3 - 5 Years |  |  | More than 5 Years |
Operating lease obligations |  | $ | 15,739 |  |  | $ | 2,555 |  |  | $ | 5,170 |  |  | $ | 2,896 |  |  | $ | 5,118 |
Purchase obligations (1) |  |  | 4,066 |  |  |  | 4,066 |  |  |  | — |  |  |  | — |  |  |  | — |
Contingent consideration (2) |  |  | 2,041 |  |  |  | 373 |  |  |  | 1,535 |  |  |  | 133 |  |  |  | — |
Total |  | $ | 21,846 |  |  | $ | 6,994 |  |  | $ | 6,705 |  |  | $ | 3,029 |  |  | $ | 5,118 |

(1) | Primarily represents purchase orders for the procurement of raw material for manufacturing.

(2) | Represents the current estimated fair value of contingent consideration amounts relating to acquisitions. These amounts are recorded in accrued expenses and long term liabilities on our consolidated balance sheets.

Cautionary Statement Regarding Forward-Looking Statements

This Quarterly Report on Form 10-Q contains forward-looking statements which are made pursuant to the safe harbor provisions of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). The forward-looking statements in this Quarterly Report on Form 10-Q do not constitute guarantees of future performance. Investors are cautioned that statements in this Quarterly Report on Form 10-Q which are not strictly historical statements, including, without limitation, express or implied statements or guidance regarding current or future financial performance and position, our strategic decision to focus on the growth of our bioprocessing business, management’s strategy, plans and objectives for future operations or acquisitions, clinical trials and results, litigation strategy, product candidate research, development and regulatory approval, selling, general and administrative expenditures, intellectual property, development and manufacturing plans, availability of materials and product and adequacy of capital resources and financing plans constitute forward-looking statements. Such forward-looking statements are subject to a number of risks and uncertainties that could cause actual results to differ materially from those anticipated, including, without limitation, risks associated with: the success of current and future collaborative or supply relationships, including our agreement with Pfizer and BioMarin, our ability to successfully negotiate and consummate development and commercialization partnerships for our portfolio of therapeutic and diagnostic assets on acceptable terms, if at all, our ability to successfully grow our bioprocessing business, including as a result of acquisition, commercialization or partnership opportunities, the success of our clinical trials and our ability to develop and commercialize products, our ability to obtain required regulatory approvals, our compliance with all Food and Drug Administration regulations, our ability to obtain, maintain and protect intellectual property rights for our products, the risk of litigation regarding our patent and other intellectual property rights, the risk of litigation with collaborative partners, our limited sales and marketing experience and capabilities, our limited manufacturing capabilities and our dependence on third-party manufacturers and value-added resellers, our ability to hire and retain skilled personnel, the market acceptance of our products, reduced demand for our products that adversely impacts our future revenues, cash flows, results of operations and financial condition, our ability to compete with larger, better financed pharmaceutical and biotechnology companies that may develop new approaches to the treatment of our targeted diseases, our history of losses and expectation of incurring losses, our ability to generate future revenues, our ability to successfully integrate Repligen Sweden and Refine, our ability to raise additional capital to continue our drug development programs or fund potential acquisitions, our volatile stock price, the effects of our anti-takeover provisions, and the impact of the expiration on December 31, 2013 of Bristol-Meyers Squibb royalty payments based on its U.S. sales of Orencia®. Further information on potential risk factors that could affect our financial results are included in the filings made by us from time to time with the Securities and Exchange Commission including under the section entitled “Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2013.

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ITEM 3. | QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Interest Rate Risk

We have investments in money market funds and marketable securities. As a result, we are exposed to potential loss from market risks that may occur as a result of changes in interest rates, changes in credit quality of the issuer or otherwise.

We generally place our marketable security investments in high quality credit instruments, as specified in our investment policy guidelines. A hypothetical 100 basis point decrease in interest rates would result in an approximate $241,000 decrease in the fair value of our investments as of June 30, 2014. We believe, however, that the conservative nature of our investments mitigates our interest rate exposure, and our investment policy limits the amount of our credit exposure to any one issue, issuer (with the exception of U.S. agency obligations) and type of instrument. We do not expect any material loss from our marketable security investments and therefore believe that our potential interest rate exposure is limited.

Foreign Exchange Risk

Transactions by our subsidiary, Repligen Sweden, may be denominated in Swedish kronor, British pound sterling, U.S. dollars, or in Euros while the entity’s functional currency is the Swedish krona. Exchange gains or losses resulting from the translation between the transactional currency and the functional currency of Repligen Sweden are included in our consolidated statements of comprehensive income. The functional currency of the Company is U.S. dollars. Fluctuations in exchange rates may adversely affect our results of operations, financial position and cash flows. We currently do not seek to hedge this exposure to fluctuations in exchange rates.

ITEM 4. | CONTROLS AND PROCEDURES

Disclosure Controls and Procedures

The Company’s management, with the participation of the principal executive officer and the principal financial officer, has evaluated the effectiveness of the Company’s disclosure controls and procedures (as defined in Rules 13a-15(e) or 15d-15(e) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)) as of the end of the period covered by this report. Based on such evaluation, the principal executive officer and principal financial officer have concluded that, as of the end of such period, the Company’s disclosure controls and procedures were effective in ensuring that information required to be disclosed by the Company in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported, on a timely basis, and is accumulated and communicated to the Company’s management, including the Company’s principal executive officer and the Company’s principal financial officer, as appropriate, to allow timely decisions regarding required disclosure.

Changes in Internal Control

Repligen acquired the Refine Business in the second quarter of 2014. The Refine Business is included in our unaudited condensed consolidated financial statements as of June 30, 2014 and for the quarter then ended. The Refine Business represented approximately 21% of our total assets as of June 30, 2014 and approximately $466,000 and $56,000 of revenue and net income, respectively, for the quarter then ended. As this acquisition occurred in the second quarter of 2014, the scope of our assessment of our internal control over financial reporting does not include the Refine Business. This exclusion is in accordance with the SEC’s general guidance that an assessment of a recently acquired business may be omitted from our scope in the year of acquisition.

Other than the change noted above, there was no change in the Company’s internal control over financial reporting that occurred during the period covered by this Quarterly Report on Form 10-Q that has materially affected, or is reasonably likely to materially affect, the Company’s internal control over financial reporting.

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PART II. OTHER INFORMATION

ITEM 1. | LEGAL PROCEEDINGS

From time to time, we may be subject to other legal proceedings and claims in the ordinary course of business. We are not currently aware of any such proceedings or claims that we believe will have, individually or in the aggregate, a material adverse effect on our business, financial condition or results of operations.

ITEM 1A. | RISK FACTORS

The matters discussed in this Form 10-Q include forward-looking statements that involve risks or uncertainties. These statements are neither promises nor guarantees, but are based on various assumptions by management regarding future circumstances, over many of which Repligen has little or no control. A number of important risks and uncertainties, including those identified under the caption “Risk Factors” in Item 1A in our Annual Report on Form 10-K for the year ended December 31, 2013 and subsequent filings as well as risks and uncertainties discussed elsewhere and below in this Form 10-Q, could cause our actual results to differ materially from those in the forward-looking statements. There are no material changes to the Risk Factors described in our Annual Report on Form 10-K for the fiscal year ended December 31, 2013, other than as set forth below to update for the Refine Acquisition.

Refine’s business relies on a limited number of suppliers or, in some cases, one supplier, and may not be able to find replacements or immediately transition to alternative suppliers, which could have a material adverse effect on the Refine business and our financial condition, results of operations and reputation.

Refine relies on a limited number of suppliers, one of whom is an exclusive supplier for consumable products related to Refine’s ATF system. An interruption in Refine’s operations could occur if Refine encounters delays or difficulties in securing these materials, or if Refine cannot then obtain an acceptable substitute. Any such interruption could significantly affect Refine’s business and our financial condition, results of operations and reputation.

We believe that only a small number of suppliers are currently qualified to supply materials for the ATF system. The use of materials furnished by these replacement suppliers would require us to alter Refine’s operations. Transitioning to a new supplier would be time consuming and expensive, may result in interruptions in Refine’s operations, could affect the performance specifications of the ATF system or could require that we revalidate the materials. There can be no assurance that we will be able to secure alternative materials, and bring such materials on line and revalidate them without experiencing interruptions in our workflow. If we should encounter delays or difficulties in securing, reconfiguring or revalidating the materials required for ATF system, Refine’s business and our financial condition, results of operations and reputation could be adversely affected.

If intangible assets that we recorded in connection with the Refine acquisition become impaired, we could have to take significant charges against earnings.

In connection with the accounting for the Refine acquisition, we recorded a significant amount of intangible assets, including developed technology and customer relationships relating to the ATF system. Under U.S. GAAP, we must assess, at least annually and potentially more frequently, whether the value of intangible assets has been impaired. Intangible assets will be assessed for impairment in the event of an impairment indicator. Any reduction or impairment of the value of intangible assets will result in a charge against earnings, which could materially adversely affect our results of operations and shareholders’ equity in future periods.

Our acquisitions expose us to risks that could adversely affect our business, and we may not achieve the anticipated benefits of acquisitions of businesses or technologies.

Any acquisition involves numerous risks and operational, financial, and managerial challenges, including difficulties in integrating new operations, or underperformance of any acquired technologies or products relative to our expectations and the price we paid. In connection with our acquisition of the Refine Business, we entered into a transition services agreement whereby the sellers agreed to provide transitional services that are reasonably required to operate the Refine Business for a period of up to six (6) months. During or after this transitional period, we may not be able to successfully or optimally operate the Refine Business, or integrate such operation into our current business, which could adversely affect our business, financial condition, or results of operations. Furthermore, we expect a portion of our future revenue growth to come from introducing new products and technologies from our acquisition of the Refine Business, such as Refine’s ATF system. The commercial success will depend on, among other factors, our successful integration of the Refine Business, and the acceptance of the new products and technologies by the life science and biopharmaceutical industries. As a result, there can be no assurance that these new products and technologies, even if successfully developed and introduced, will be accepted by customers. If customers do not adopt our new products and technologies, our results of operations may suffer and, as a result, the market price of our common stock may decline.

ITEM 2. | UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

In June 2008, the Board of Directors authorized a program to repurchase up to 1.25 million shares of our common stock to be repurchased at the discretion of management from time to time in the open market or through privately negotiated transactions. The

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repurchase program has no set expiration date and may be suspended or discontinued at any time. We did not repurchase any shares of common stock during the three or six-month periods ended June 30, 2014. As of June 30, 2014, there are 657,173 shares remaining under this authorization.

Pursuant to the Asset Purchase Agreement described in Note 2 to Condensed Consolidated Financial Statements, on June 2, 2014, the Company issued 215,285 share of its $0.01 par value common stock valued at $4,000,000 to the sellers as part of the consideration for the Refine Acquisition. The issuance is not registered under the Securities Act of 1933, as amended (the “Securities Act”), in reliance upon the exemption from registration provided by Section 4(2) of the Securities Act.

ITEM 3. | DEFAULTS UPON SENIOR SECURITIES

None.

ITEM 4. | MINE SAFETY DISCLOSURES

Not applicable.

ITEM 5. | OTHER INFORMATION

None.

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ITEM 6. | EXHIBITS

(a) Exhibits

Exhibit Number |  | Document Description
3.1 |  | Restated Certificate of Incorporation, dated June 30, 1992 and amended September 17, 1999 (filed as Exhibit 3.1 to Repligen Corporation’s Quarterly Report on Form 10-Q for the quarter ended September 30, 1999 and incorporated herein by reference). (File No. 000-14656)
3.2 |  | Amended and Restated By-Laws (filed as Exhibit 3.2 to Repligen Corporation’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2003 and incorporated herein by reference). (File No. 000-14656)
3.3 |  | Amendment No. 1 to the Amended and Restated By-Laws (filed as Exhibit 3.1 to Repligen Corporation’s Current Report on Form 8-K filed on December 20, 2011 and incorporated herein by reference).
3.4 |  | Amendment No. 2 to the Amended and Restated By-Laws (filed as Exhibit 3.1 to Repligen Corporation’s Current Report on Form 8-K filed on May 25, 2012 and incorporated herein by reference).
3.5 |  | Certificate of Amendment to the Certificate of Incorporation of Repligen Corporation, effective as of May 16, 2014 (filed as Exhibit 3.1 to Repligen Corporation’s Current Report on Form 8-K filed on May 19, 2014 and incorporated herein by reference).
10.1 |  | Repligen Corporation Amended and Restated 2012 Stock Option and Incentive Plan (filed as exhibit 99.1 to Form S-8 filed on May 9, 2014 and incorporated herein by reference).
10.2 |  | Letter Agreement, dated as of April 7, 2014, by and between Repligen Corporation and Tony J. Hunt (filed as Exhibit 10.1 to Repligen Corporation’s Current Report on Form 8-K filed on May 6, 2014 and incorporated herein by reference).
10.3 +§ |  | Asset Purchase Agreement, dated as of June 2, 2013, by and among Repligen Corporation, Refine Technology, LLC, Jerry Shevitz, certain members of Refine Technology, LLC, Refine Technology Sales LLC, and Refine Technology Sales Asia Pte. Ltd.
31.1 + |  | Rule 13a-14(a)/15d-14(a) Certification.
31.2 + |  | Rule 13a-14(a)/15d-14(a) Certification.
32.1 * |  | Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101+ |  | The following materials from Repligen Corporation on Form 10-Q for the quarterly period ended June 30, 2014, formatted in Extensible Business Reporting Language (xBRL): (i) Condensed Consolidated Statements of Comprehensive Income, (ii) Condensed Consolidated Balance Sheets, (iii) Condensed Consolidated Statements of Cash Flows, and (iv) Notes to Condensed Consolidated Financial Statements, tagged as blocks of text.

+ | Filed herewith.

* | Furnished herewith.

§ | Confidential treatment has been requested for portions of the exhibit and is pending clearance with the Securities and Exchange Commission.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

|  |  |  | REPLIGEN CORPORATION
Date: August 11, 2014 |  |  |  | By: |  | /S/ WALTER C. HERLIHY
|  |  |  |  |  | Walter C. Herlihy
|  |  |  |  |  | President and Chief Executive Officer
|  |  |  |  |  | (Principal executive officer)
|  |  |  |  |  | Repligen Corporation
Date: August 11, 2014 |  |  |  | By: |  | /S/ JON SNODGRES
|  |  |  |  |  | Jon Snodgres
|  |  |  |  |  | Chief Financial Officer
|  |  |  |  |  | (Principal financial officer)
|  |  |  |  |  | Repligen Corporation

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EXHIBIT INDEX

Exhibit Number |  | Document Description
3.1 |  | Restated Certificate of Incorporation, dated June 30, 1992 and amended September 17, 1999 (filed as Exhibit 3.1 to Repligen Corporation’s Quarterly Report on Form 10-Q for the quarter ended September 30, 1999 and incorporated herein by reference). (File No. 000-14656)
3.2 |  | Amended and Restated By-Laws (filed as Exhibit 3.2 to Repligen Corporation’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2003 and incorporated herein by reference). (File No. 000-14656)
3.3 |  | Amendment No. 1 to the Amended and Restated By-Laws (filed as Exhibit 3.1 to Repligen Corporation’s Current Report on Form 8-K filed on December 20, 2011 and incorporated herein by reference).
3.4 |  | Amendment No. 2 to the Amended and Restated By-Laws (filed as Exhibit 3.1 to Repligen Corporation’s Current Report on Form 8-K filed on May 25, 2012 and incorporated herein by reference).
3.5 |  | Certificate of Amendment to the Certificate of Incorporation of Repligen Corporation, effective as of May 16, 2014 (filed as Exhibit 3.1 to Repligen Corporation’s Current Report on Form 8-K filed on May 19, 2014 and incorporated herein by reference).
10.1 |  | Repligen Corporation Amended and Restated 2012 Stock Option and Incentive Plan (filed as exhibit 99.1 to Form S-8 filed on May 9, 2014 and incorporated herein by reference).
10.2 |  | Letter Agreement, dated as of April 7, 2014, by and between Repligen Corporation and Tony J. Hunt (filed as Exhibit 10.1 to Repligen Corporation’s Current Report on Form 8-K filed on May 6, 2014 and incorporated herein by reference).
10.3 +§ |  | Asset Purchase Agreement, dated as of June 2, 2013, by and among Repligen Corporation, Refine Technology, LLC, Jerry Shevitz, certain members of Refine Technology, LLC, Refine Technology Sales LLC, and Refine Technology Sales Asia Pte. Ltd.
31.1 + |  | Rule 13a-14(a)/15d-14(a) Certification.
31.2 + |  | Rule 13a-14(a)/15d-14(a) Certification.
32.1 * |  | Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101+ |  | The following materials from Repligen Corporation on Form 10-Q for the quarterly period ended June 30, 2014, formatted in Extensible Business Reporting Language (xBRL): (i) Consolidated Statements of Comprehensive Income, (ii) Consolidated Balance Sheets, (iii) Consolidated Statements of Cash Flows, and (iv) Notes to Consolidated Financial Statements, tagged as blocks of text.

+ | Filed herewith.

* | Furnished herewith.

§ | Confidential treatment has been requested for portions of the exhibit and is pending clearance with the Securities and Exchange Commission.

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