10-Q 1 lfus20180331_10q.htm FORM 10-Q

TABLE OF CONTENTS

UNITED STATES

Securities and Exchange Commission

Washington, D.C. 20549

FORM 10-Q

(Mark one) |
[X] | QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
| For the Quarterly Period Ended March 31, 201 8
OR
[ ] | TRANSITION REPORT PURSUANT TO SECTION 13 or 15(d) OF THE SECURITIES ACT OF 1934
| For the transition period from ___ to ___

Commission file number 0-20388

LITTELFUSE, INC.

(Exact name of registrant as specified in its charter)

Delaware | 36-3795742
(State or other jurisdiction of | (I.R.S. Employer Identification No.)
incorporation or organization) |
8755 West Higgins Road, Suite 500 |
Chicago, Illinois | 60631
(Address of principal executive offices) | (ZIP Code)

Registrant’s telephone number, including area code: 773-628-1000

Securities registered pursuant to Section 12(b) of the Act:

Title of Each Class | Name of Each Exchange On Which Registered
Common Stock, $0.01 par value | NASDAQ Global Select MarketSM

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 (Section 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 a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act (Check one): Large accelerated filer [X] Accelerated filer [ ] Non-accelerated filer [ ] Smaller reporting company [ ] Emerging growth company [ ]

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. [ ]

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

As of April 27, 2018, the registrant had outstanding 24,966,975 shares of Common Stock, net of Treasury Shares.

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TABLE OF CONTENTS

| Page
PART I | FINANCIAL INFORMATION |
Item 1. | Financial Statements |
| Condensed Consolidated Balance Sheets as of March 31, 2018 (unaudited) and December 30, 2017 | 3
| Condensed Consolidated Statements of Net Income for the three months ended March 31, 2018 (unaudited) and April 1, 2017 (unaudited) | 4
| Condensed Consolidated Statements of Comprehensive Income for the three months ended March 31, 2018 (unaudited) and April 1, 2017 (unaudited) | 5
| Condensed Consolidated Statements of Cash Flows for the three months ended March 31, 2018 (unaudited) and April 1, 2017 (unaudited) | 6
| Notes to Condensed Consolidated Financial Statements (unaudited) | 7
Item 2. | Management’s Discussion and Analysis of Financial Condition and Results of Operations | 23
Item 3. | Quantitative and Qualitative Disclosures About Market Risk | 29
Item 4. | Controls and Procedures | 29
PART II | OTHER INFORMATION |
Item 1. | Legal Proceedings | 30
Item 1A. | Risk Factors | 30
Item 2. | Unregistered Sales of Equity Securities and Use of Proceeds | 30
Item 3. | Defaults Upon Senior Securities | 30
Item 4. | Mine Safety Disclosures | 30
Item 5. | Other Information | 30
Item 6. | Exhibits | 31
Signatures | 32

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LITTELFUSE, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(in thousands) |  | March 3 1, 201 8 |  |  | December 30, 2017 |
ASSETS |  |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 412,458 |  |  | $ | 429,676 |
Short-term investments |  |  | 37 |  |  |  | 35 |
Trade receivables, less allowances (March 31, 2018 - $33,746; December 30, 2017 - $27,516) |  |  | 244,905 |  |  |  | 182,699 |
Inventories |  |  | 263,969 |  |  |  | 140,789 |
Prepaid income taxes and income taxes receivable |  |  | 3,899 |  |  |  | 1,689 |
Prepaid expenses and other current assets |  |  | 47,794 |  |  |  | 37,452 |
Total current assets |  |  | 973,062 |  |  |  | 792,340 |
Property, plant, and equipment: |  |  |  |  |  |  |  |
Land |  |  | 29,575 |  |  |  | 9,547 |
Buildings |  |  | 118,170 |  |  |  | 86,599 |
Equipment |  |  | 555,578 |  |  |  | 505,838 |
Accumulated depreciation and amortization |  |  | (366,118 | ) |  |  | (351,407 | )
Net property, plant, and equipment |  |  | 337,205 |  |  |  | 250,577 |
Intangible assets, net of amortization |  |  | 405,406 |  |  |  | 203,850 |
Goodwill |  |  | 840,574 |  |  |  | 453,414 |
Investments |  |  | 31,128 |  |  |  | 10,993 |
Deferred income taxes |  |  | 12,039 |  |  |  | 11,858 |
Other assets |  |  | 28,096 |  |  |  | 17,070 |
Total assets |  | $ | 2,627,510 |  |  | $ | 1,740,102 |
LIABILITIES AND EQUITY |  |  |  |  |  |  |  |
Current liabilities: |  |  |  |  |  |  |  |
Accounts payable |  | $ | 120,817 |  |  | $ | 101,844 |
Accrued payroll |  |  | 41,220 |  |  |  | 49,962 |
Accrued expenses |  |  | 74,925 |  |  |  | 48,994 |
Accrued severance |  |  | 1,367 |  |  |  | 1,459 |
Accrued income taxes |  |  | 15,938 |  |  |  | 16,285 |
Current portion of long-term debt |  |  | 10,111 |  |  |  | 6,250 |
Total current liabilities |  |  | 264,378 |  |  |  | 224,794 |
Long-term debt, less current portion |  |  | 743,437 |  |  |  | 489,361 |
Deferred income taxes |  |  | 60,525 |  |  |  | 17,069 |
Accrued post-retirement benefits |  |  | 35,817 |  |  |  | 18,742 |
Other long-term liabilities |  |  | 81,379 |  |  |  | 62,580 |
Shareholders’ equity: |  |  |  |  |  |  |  |
Common stock, par value $0.01 per share: 34,000,000 shares authorized; shares issued, March 31, 2018–24,936,931; December 30, 2017 –22,713,198 |  |  | 251 |  |  |  | 229 |
Treasury stock, at cost: 453,571 and 439,598 shares, respectively |  |  | (44,052 | ) |  |  | (41,294 | )
Additional paid-in capital |  |  | 800,614 |  |  |  | 310,012 |
Accumulated other comprehensive income |  |  | (73,742 | ) |  |  | (63,668 | )
Retained earnings |  |  | 758,766 |  |  |  | 722,140 |
Littelfuse, Inc. shareholders’ equity |  |  | 1,441,837 |  |  |  | 927,419 |
Non-controlling interest |  |  | 137 |  |  |  | 137 |
Total equity |  |  | 1,441,974 |  |  |  | 927,556 |
Total liabilities and equity |  | $ | 2,627,510 |  |  | $ | 1,740,102 |

See accompanying Notes to Condensed Consolidated Financial Statements.

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LITTELFUSE, INC.

CONDENSED CONSOLIDATED STATEMENTS OF NET INCOME

(Unaudited)

|  | For the Three Months Ended |
(in thousands, except per share data) |  | March 3 1, 201 8 |  |  | April 1, 2017 |
Net sales |  | $ | 417,813 |  |  | $ | 285,441 |
Cost of sales |  |  | 268,190 |  |  |  | 171,791 |
Gross profit |  |  | 149,623 |  |  |  | 113,650 |
Selling, general, and administrative expenses |  |  | 77,514 |  |  |  | 46,703 |
Research and development expenses |  |  | 22,540 |  |  |  | 12,151 |
Amortization of intangibles |  |  | 11,998 |  |  |  | 5,944 |
Total operating expenses |  |  | 112,052 |  |  |  | 64,798 |
Operating income |  |  | 37,571 |  |  |  | 48,852 |
Interest expense |  |  | 5,423 |  |  |  | 3,120 |
Foreign exchange gain |  |  | (10,555 | ) |  |  | (1,557 | )
Other (income) expense, net |  |  | (1,943 | ) |  |  | (139 | )
Income before income taxes |  |  | 44,646 |  |  |  | 47,428 |
Income taxes |  |  | 8,617 |  |  |  | 8,537 |
Net income |  | $ | 36,029 |  |  | $ | 38,891 |
Income per share: |  |  |  |  |  |  |  |
Basic |  | $ | 1.48 |  |  | $ | 1.71 |
Diluted |  | $ | 1.45 |  |  | $ | 1.69 |
Weighted-average shares and equivalent shares outstanding: |  |  |  |  |  |  |  |
Basic |  |  | 24,339 |  |  |  | 22,748 |
Diluted |  |  | 24,775 |  |  |  | 22,989 |
Cash dividends declared per common share |  | $ | 0.37 |  |  | $ | 0.33 |

See accompanying Notes to Condensed Consolidated Financial Statements.

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LITTELFUSE, INC.

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Unaudited)

|  | For the Three Months Ended |
(in thousands) |  | March 31, 2018 |  |  | April 1, 2017 |
Net income |  | $ | 36,029 |  |  | $ | 38,891 |
Other comprehensive income (loss): |  |  |  |  |  |  |  |
Pension and postemployment liability adjustments (net of tax expense (benefit) of ($60) and ($32), respectively) |  |  | (188 | ) |  |  | (181 | )
Pension and postemployment reclassification adjustments (net of tax (benefit) expense of ($5) and $36, respectively) |  |  | 185 |  |  |  | (101 | )
Unrealized (loss) gain on investments |  |  | - |  |  |  | 947 |
Foreign currency translation adjustments |  |  | (276 | ) |  |  | 4,962 |
Comprehensive income |  | $ | 35,750 |  |  | $ | 44,518 |

See accompanying Notes to Condensed Consolidated Financial Statements.

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LITTELFUSE, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

|  | For the Three Months Ended |
(in thousands) |  | March 31, 2018 |  |  | April 1, 201 7 |
Operating activities |  |  |  |  |  |  |  |
Net income |  | $ | 36,029 |  |  | $ | 38,891 |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |
Depreciation |  |  | 11,614 |  |  |  | 9,128 |
Amortization of intangibles |  |  | 11,998 |  |  |  | 5,944 |
Provision for bad debts |  |  | (13 | ) |  |  | 351 |
Non-cash inventory charges |  |  | 17,896 |  |  |  | — |
Unrealized gain on investments |  |  | (1,864 | ) |  |  | — |
Loss on sale of property, plant, and equipment |  |  | 99 |  |  |  | 600 |
Stock-based compensation |  |  | 8,714 |  |  |  | 3,583 |
Deferred income taxes |  |  | 842 |  |  |  | 616 |
Changes in operating assets and liabilities: |  |  |  |  |  |  |  |
Accounts receivable |  |  | (8,417 | ) |  |  | (11,267 | )
Inventories |  |  | (269 | ) |  |  | (3,296 | )
Accounts payable |  |  | 2,990 |  |  |  | (3,295 | )
Accrued expenses (including post-retirement) |  |  | 12,573 |  |  |  | 4,140 |
Accrued payroll and severance |  |  | (18,607 | ) |  |  | (20,221 | )
Accrued taxes |  |  | (1,174 | ) |  |  | (220 | )
Prepaid expenses and other |  |  | (3,143 | ) |  |  | (2,011 | )
Net cash provided by operating activities |  |  | 69,268 |  |  |  | 22,943 |
Investing activities |  |  |  |  |  |  |  |
Acquisitions of businesses, net of cash acquired |  |  | (306,487 | ) |  |  | (14,172 | )
Proceeds from maturities of short-term investments |  |  | — |  |  |  | 3,739 |
Decrease in entrusted loan |  |  | — |  |  |  | 655 |
Purchases of property, plant, and equipment |  |  | (17,909 | ) |  |  | (12,377 | )
Proceeds from sale of property, plant, and equipment |  |  | 19 |  |  |  | 57 |
Net cash used in investing activities |  |  | (324,377 | ) |  |  | (22,098 | )
Financing activities |  |  |  |  |  |  |  |
Proceeds of revolving credit facility |  |  | 50,000 |  |  |  | — |
Proceeds of term loan |  |  | 75,000 |  |  |  | — |
Proceeds of senior notes payable |  |  | 175,000 |  |  |  | 125,000 |
Payments of term loan |  |  | (2,500 | ) |  |  | (1,563 | )
Payments of revolving credit facility |  |  | (47,000 | ) |  |  | (112,500 | )
Net (payments) proceeds related to stock-based award activities |  |  | (116 | ) |  |  | 199 |
Proceeds (payments) from entrusted loan |  |  | — |  |  |  | (655 | )
Debt issuance costs |  |  | (878 | ) |  |  | (71 | )
Cash dividends paid |  |  | (9,198 | ) |  |  | (7,472 | )
Net cash provided by financing activities |  |  | 240,308 |  |  |  | 2,938 |
Effect of exchange rate changes on cash and cash equivalents |  |  | (2,417 | ) |  |  | (928 | )
Increase (decrease) in cash and cash equivalents |  |  | (17,218 | ) |  |  | 2,855 |
Cash and cash equivalents at beginning of year |  |  | 429,676 |  |  |  | 275,124 |
Cash and cash equivalents at end of year |  | $ | 412,458 |  |  | $ | 277,979 |

See accompanying Notes to Condensed Consolidated Financial Statements.

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1. Summary of Significant Accounting Policies and Other Information

Nature of Operations

Littelfuse, Inc. and subsidiaries (the “Company”) is a global leader in circuit protection products with advancing platforms in power control and sensor technologies, serving customers in the electronics, automotive, and industrial markets. With a diverse and extensive product portfolio of fuses, semiconductors, polymers, ceramics, relays and sensors, the Company works with its customers to build safer, more reliable and more efficient products for the connected world in virtually every market that uses electrical energy, ranging across consumer electronics, IT and telecommunication applications, industrial electronics, automobiles and other transportation, and heavy industrial applications. The Company has a network of global engineering centers and labs that develop new products and product enhancements, provides customer application support and test products for safety, reliability, and regulatory compliance.

Basis of Presentation

The Company’s accompanying unaudited Condensed Consolidated Financial Statements have been prepared in accordance with U.S. Generally Accepted Accounting Principles (“GAAP”) for interim financial information, the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, certain information and disclosures normally included in the consolidated balance sheets, statements of net income and comprehensive income and cash flows prepared in conformity with U.S. GAAP have been condensed or omitted as permitted by such rules and regulations, although the Company believes that the disclosures made are adequate to make the information not misleading. They have been prepared in accordance with accounting policies described in the Company’s Annual Report on Form 10-K for the year ended December 30, 2017, which should be read in conjunction with the disclosures therein. In the opinion of management, all adjustments considered necessary for a fair presentation have been included and are of a normal, recurring nature. Operating results for interim periods are not necessarily indicative of annual operating results.

Revenue Recognition

Adoption

On December 31, 2017, the Company adopted new guidance on revenue from contracts with customers using the modified retrospective method. The adoption did not have a significant impact on the Company’s consolidated financial statements.

Revenue Disaggregation

The following table disaggregates the Company’s revenue by primary business units for the three months ended March 31, 2018:

(in thousands) |  | Electronics Segment |  |  | Automotive Segment |  |  | Industrial Segment |  |  | Total |
Electronics – Passive Products and Sensors |  | $ | 114,495 |  |  | $ | — |  |  | $ | — |  |  | $ | 114,495 |
Electronics - Semiconductor |  |  | 149,916 |  |  |  | — |  |  |  | — |  |  |  | 149,916 |
Passenger Car Products |  |  | — |  |  |  | 63,580 |  |  |  | — |  |  |  | 63,580 |
Automotive Sensors |  |  | — |  |  |  | 31,323 |  |  |  | — |  |  |  | 31,323 |
Commercial Vehicle Products |  |  | — |  |  |  | 31,228 |  |  |  | — |  |  |  | 31,228 |
Industrial Products |  |  | — |  |  |  | — |  |  |  | 27,271 |  |  |  | 27,271 |
Total |  | $ | 264,411 |  |  | $ | 126,131 |  |  | $ | 27,271 |  |  | $ | 417,813 |

See Note 12, Segment Information for net sales by segment and countries.

Revenue Recognition

The Company recognizes revenue on product sales in the period in which the Company satisfies its performance obligation and control of the product is transferred to the customer. The Company’s sales arrangements with customers are predominately short term in nature and generally provide for transfer of control at the time of shipment as this is the point at which title and risk of loss of the product transfers to the customer. At the end of each period, for those shipments where title to the products and the risk of loss and rewards of ownership do not transfer until the product has been received by the customer, the Company adjusts revenues and cost of sales for the delay between the time that the products are shipped and when they are received by the customer. The amount of revenue recorded reflects the consideration to which the Company expects to be entitled in exchange for goods and may include adjustments for customer allowance, rebates and price adjustments. The Company’s distribution channels are primarily through direct sales and independent third-party distributors.

The Company has elected the practical expedient under ASC 340-40-25-4 to expense commissions when incurred as the amortization period of the commission asset the Company would have otherwise recognized is less than one year.

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Revenue and Billing

The Company generally accepts orders from customers through receipt of purchase orders or electronic data interchange based on written sales agreements and purchasing contracts. Contract pricing and selling agreement terms are based on market factors, costs, and competition. Pricing is often negotiated as an adjustment (premium or discount) from the Company’s published price lists. The customer is invoiced when the Company’s products are shipped to them in accordance with the terms of the sales agreement. As the Company’s standard payment terms are less than one year, the Company has elected the practical expedient under ASC 606-10-32-18 to not assess whether a contract has a significant financing component. The Company also elected the practical expedient provided in ASC 606-10-25-18B to treat all product shipping and handling activities as fulfillment activities, and therefore recognize the gross revenue associated with the contract, inclusive of any shipping and handling revenue. This is similar to the Company’s prior practice and therefore the effect of the new guidance is immaterial.

Ship and Debit Program

Some of the terms of the Company’s sales agreements and normal business conditions provide customers (distributors) the ability to receive price adjustments on products previously shipped and invoiced. This practice is common in the industry and is referred to as a “ship and debit” program. This program allows the distributor to debit the Company for the difference between the distributors’ contracted price and a lower price for specific transactions. Under certain circumstances (usually in a competitive situation or large volume opportunity), a distributor will request authorization for pricing allowances to reduce its price. When the Company approves such a reduction, the distributor is authorized to “debit” its account for the difference between the contracted price and the lower approved price. The Company establishes reserves for this program based on historic activity and actual authorizations for the debit and recognizes these debits as a reduction of revenue.

Return to Stock

The Company has a return to stock policy whereby certain customers, with prior authorization from Littelfuse management, can return previously purchased goods for full or partial credit. The Company establishes an estimated allowance for these returns based on historic activity. Sales revenue and cost of sales are reduced to anticipate estimated returns.

Volume Rebates

The Company offers volume based sales incentives to certain customers to encourage greater product sales. If customers achieve their specific quarterly or annual sales targets, they are entitled to rebates. The Company estimates the projected amount of rebates that will be achieved by the customer and recognizes this estimated cost as a reduction to revenue as products are sold.

Recently Adopted Accounting Standards

In March 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2017-07 “Compensation-Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Post-Retirement Benefit Cost,” which changed the presentation of net periodic pension and post-retirement benefit cost (net benefit cost) within the Statement of Income. Under the previous guidance, net benefit cost was reported as an employee cost within operating income. The amendment required the bifurcation of net benefit cost, with the service cost component to be presented with other employee compensation costs in operating income while the other components will be reported separately outside of income from operations. ASU No. 2017-07 was effective for the first quarter of 2018 with the Company adopting the new standard on December 31, 2017.

In January 2016, the FASB issued ASU No. 2016-01, “Financial Instruments-Recognition and Measurement of Financial Assets and Financial Liabilities” which addressed certain aspects of the recognition, measurement, presentation and disclosure of financial instruments. The ASU requires the Company to recognize any changes in the fair value of certain equity investments in net income. Previously these changes were recognized in other comprehensive income ("OCI"). The Company adopted the new standard on December 31, 2017, on a modified retrospective basis, recognizing the cumulative effect as a $9.8 million increase to retained earnings. As a result of the adoption of the new standard and change in fair value of our equity investments, for the three months ended March 31, 2018, the Company recognized an unrealized gain of $1.9 million in Other (income) expense, net in the Condensed Consolidated Statements of Net Income.

In May 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers” (Topic 606) which supersedes the revenue recognition requirements in ASC 605, “Revenue Recognition.” This ASU provides a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and will supersede most current revenue recognition guidance. The guidance permits two implementation approaches, one requiring retrospective application of the new standard with restatement of prior years and one requiring prospective application of the new standard with disclosure of results under old standards. The Company adopted the new standard on December 31, 2017 using the modified retrospective method, however, no adjustment to retained earnings was needed. The new guidance did not have a material effect on the Company’s Condensed Consolidated Statements of Income. See the Revenue Recognition section above for further discussion.

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In October 2016, the FASB issued ASU No. 2016-16, "Income Taxes” (Topic 740). This ASU update requires entities to recognize the income tax consequences of many intercompany asset transfers at the transaction date. The seller and buyer will immediately recognize the current and deferred income tax consequences of an intercompany transfer of an asset other than inventory. The tax consequences were previously deferred. The Company adopted the new standard on December 31, 2017 and it did not have a material impact.

Recently Issued Accounting Standards

In February 2016, the FASB issued ASU No. 2016-02, "Leases" (Topic 842). This ASU requires lessees to recognize, on the balance sheet, assets and liabilities for the rights and obligations created by leases of greater than twelve months. The accounting by lessors will remain largely unchanged. The ASU is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018, with early adoption permitted. Adoption will require a modified retrospective transition. The Company will adopt the standard in the first quarter of 2019. The Company is currently evaluating the impact of ASU 2016-02.

In January 2018, the FASB released guidance on the accounting for tax on the global intangible low-taxed income ("GILTI") provisions in the Tax Act. The GILTI provisions impose a tax on foreign income in excess of a deemed return on tangible assets of foreign corporations. The guidance indicates that either accounting for deferred taxes related to GILTI inclusions or treating any taxes on GILTI inclusions as period cost are both acceptable methods subject to an accounting policy election. The Company has not yet completed its assessment and therefore has not yet elected an accounting policy.

In February 2018, the FASB issued ASU No. 2018-02 “Income Statement—Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income,” which permits the reclassification of tax effects stranded in accumulated other comprehensive income to retained earnings as a result of the Tax Act. The standard also requires entities to disclose whether or not they elected to reclassify the tax effects related to the Tax Act as well as their policy for releasing income tax effects from accumulated other comprehensive income. The standard allows the option of applying either a retrospective adoption, meaning the standard is applied to all periods in which the effect of the Tax Act is recognized, or applying the amendments in the period of adoption, meaning an adjustment is made to shareholder’s equity as of the beginning of the reporting period. ASU 2018-02 will be effective in the first quarter of 2019; however early adoption is permitted for interim and annual periods, including the reporting period in which the Tax Act was enacted. The Company is currently evaluating the impact of ASU 2018-02 on the Consolidated Financial Statements.

2. Acquisitions

The Company accounts for acquisitions using the acquisition method in accordance with ASC 805, “Business Combinations,” in which assets acquired and liabilities assumed are recorded at fair value as of the date of acquisition. The operating results of the acquired business are included in the Company’s Consolidated Financial Statements from the date of the acquisition.

IXYS Corporation

On January 17, 2018, the Company acquired IXYS Corporation (“IXYS”), a global pioneer in the power semiconductor and integrated circuit markets with a focus on medium to high voltage power control semiconductors across the industrial, communications, consumer and medical markets. IXYS has a broad customer base, serving more than 3,500 customers through its direct sales force and global distribution partners. The acquisition of IXYS is expected to accelerate the Company’s growth across the power control market driven by IXYS’s extensive power semiconductor portfolio and technology expertise. With IXYS, the Company will be able to diversify and expand its presence within industrial electronics markets, leveraging the strong IXYS industrial OEM customer base. The Company also expects to increase long-term penetration of its power semiconductor portfolio in automotive markets, expanding its global content per vehicle.

Upon completion of the acquisition, at IXYS stockholders’ election and subject to proration, each share of IXYS common stock, par value $0.01 per share, owned immediately prior to the effective time was cancelled and extinguished and automatically converted into the right to receive: (i) $23.00 in cash (subject to applicable withholding tax), without interest (referred to as the cash consideration), or (ii) 0.1265 of a share of common stock, par value $0.01 per share, of Littelfuse (referred to as the stock consideration). IXYS stockholders received cash in lieu of any fractional shares of Littelfuse common stock that the IXYS stockholders would otherwise have been entitled to receive. Additionally, each outstanding option to purchase shares of IXYS common stock granted under an IXYS equity plan were assumed by Littelfuse and converted into an option to acquire (i) a number of shares of Littelfuse common stock equal to the number of shares of IXYS common stock subject to such option immediately prior to the effective time multiplied by 0.1265, rounded down to the nearest whole share, with (ii) an exercise price per share of Littelfuse common stock equal to the exercise price of such IXYS stock option immediately prior to the effective time divided by 0.1265, rounded up to the nearest whole cent.

Based on the $207.5 per share opening price of Littelfuse common stock on January 17, 2018, the consideration IXYS stockholders received in exchange of their IXYS common stock in the acquisition had a value of $814.8 million comprised of $380.5 million of cash and $434.2 million of Littelfuse stock. In addition to the consideration transferred related to IXYS common stock, the value of consideration transferred, and included in the purchase price, related to IXYS stock options that were converted to Littelfuse stock options, or cash settled, had a value of $41.7 million. As a result, total consideration was valued at $856.5 million.

The total purchase price of $856.5 million has been allocated, on a preliminary basis, to assets acquired and liabilities assumed, as of the completion of the acquisition, based on preliminary estimated fair values. The purchase price allocation is preliminary because the evaluations necessary to assess the fair values of the net assets acquired are still in process. The primary areas that are not yet finalized relate to the completion of the valuations of certain acquired income tax assets and liabilities, including the impact of the adoption of the Tax Cuts and Job Act (“Tax Act”) and certain acquired investments. As a result, these allocations are subject to change during the purchase price allocation period as the valuations are finalized.

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The following table summarizes the purchase price allocation of the fair value of assets acquired and liabilities assumed in the IXYS acquisition:

(in thousands) |  | Purchase Price Allocation |
Total purchase consideration: |  |  |  |
Cash, net of cash acquired |  | $ | 302,865 |
Cash settled stock options |  |  | 3,622 |
Littelfuse stock |  |  | 434,192 |
Converted stock options |  |  | 38,109 |
Total purchase consideration |  | $ | 778,788 |
Allocation of consideration to assets acquired and liabilities assumed: |  |  |  |
Current assets, net |  | $ | 154,254 |
Property, plant, and equipment |  |  | 76,580 |
Intangible assets |  |  | 211,600 |
Goodwill |  |  | 381,599 |
Other non-current assets |  |  | 31,570 |
Other non-current liabilities |  |  | (76,815 | )
|  | $ | 778,788 |

Included in IXYS’s current assets, net was approximately $49.1 million of receivables. All IXYS goodwill, other assets and liabilities were recorded in the Electronics segment and primarily reflected in the Americas and European geographic areas. The goodwill resulting from this acquisition consists largely of the Company’s expected future product sales and synergies from combining IXYS’s products and technology with the Company’s existing electronics product portfolio. Goodwill resulting from the IXYS acquisition is not expected to be deductible for tax purposes.

Included in the Company’s Condensed Consolidated Statements of Net Income for the three months ended March 31, 2018 are net sales of approximately $86.3 million and a loss before income taxes of approximately $17.8 million since the January 17, 2018 acquisition of IXYS. The Company recognized approximately $5.9 million of stock compensation expense related to IXYS stock options converted to Littelfuse stock options during the three months ended March 31, 2018 of which $4.5 million was recognized immediately as it related to prior services periods.

As required by purchase accounting rules, the Company recorded a $36.9 million step-up of inventory to its fair value as of the acquisition date based on the preliminary valuation. The step-up is being amortized as a non-cash charge to cost of goods sold during the first and second quarters of 2018, as the acquired inventory is sold, and reflected as other non-segment costs. During the three months ended March 31, 2018, the Company recognized a charge of $17.9 million for the amortization of this fair value inventory step-up.

During the three months ended March 31, 2018, the Company incurred approximately $10.2 million of legal and professional fees related to this acquisition which were primarily recognized as selling, general, and administrative expenses. These costs were reflected as other non-segment costs.

2017 Acquisitions

U.S. Sensor

On July 7, 2017, the Company acquired the assets of U.S. Sensor Corporation (“U.S. Sensor”). The acquisition purchase price of $24.3 million, net of the finalization of an income tax gross up which was settled in the fourth quarter of 2017, was funded with available cash. The acquired business expands the Company’s existing sensor portfolio in several key electronics and industrial end markets. U.S. Sensor manufactures a variety of high quality negative temperature coefficient thermistors as well as thermistor probes and assemblies. Product lines also include thin film platinum resistance temperature detectors (“RTDs”) and RTD assemblies.

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The following table summarizes the purchase price allocation of the fair value of assets acquired and liabilities assumed in the U.S. Sensor acquisition:

(in thousands) |  | Purchase Price Allocation |
Total purchase consideration: |  |  |  |
Cash |  | $ | 24,340 |
Allocation of consideration to assets acquired and liabilities assumed: |  |  |  |
Current assets, net |  | $ | 4,635 |
Patented and unpatented technologies |  |  | 1,090 |
Trademarks and tradenames |  |  | 200 |
Non-compete agreement |  |  | 50 |
Customer relationships |  |  | 2,830 |
Goodwill |  |  | 16,075 |
Current liabilities |  |  | (540 | )
|  | $ | 24,340 |

Included in U.S. Sensor’s current assets, net was approximately $1.5 million of receivables. All U.S. Sensor goodwill, other assets and liabilities were recorded in the Electronics segment and reflected in the United States geographic area. The goodwill resulting from this acquisition consists largely of the Company’s expected future product sales and synergies from combining U.S. Sensor’s products and technology with the Company’s existing electronics product portfolio. Goodwill for the above acquisition is expected to be deductible for tax purposes.

As required by purchase accounting rules, the Company recorded a $1.6 million step-up of inventory to its fair value as of the acquisition date based on the preliminary valuation. The step-up was amortized as a non-cash charge to cost of goods sold during the third quarter of 2017, as the acquired inventory was sold, and reflected as other non-segment costs.

Monolith

In December 2015, the Company invested $3.5 million in the preferred stock of Monolith Semiconductor Inc. (“Monolith”), a U.S. start-up Company developing silicon carbide technology, which represented approximately 12% of the common stock of Monolith on an as-converted basis. The Company accounted for its investment in Monolith under the cost method with any changes in value recorded in other comprehensive income. The value of the Monolith investment was $3.5 million at December 31, 2016.

On February 28, 2017, pursuant to a Securities Purchase Agreement between the Company and the stockholders of Monolith (“Securities Purchase Agreement”) and conditioned on Monolith achieving a product development milestone and other provisions, the Company acquired 62% of the outstanding common stock of Monolith for $15 million. The Securities Purchase Agreement includes provisions whereby the Company will acquire the remaining outstanding stock of Monolith (“non-controlling interest”) at a time or times based on Monolith meeting certain technical and sales targets. During the first quarter of 2018, Monolith met the next set of technical and sales targets. As a result, and pursuant to the Securities Purchase Agreement, in April 2018 the Company acquired an additional 19% of the outstanding common stock of Monolith for $5 million. Consideration for the purchase of the remaining 19% outstanding common stock will be either $0.5 million or $5 million, based on Monolith meeting the remaining technical and sales targets, and will be paid no later than June 30, 2019.

The additional investment, in the first quarter of 2017, resulted in the Company gaining control of Monolith and was accounted for as a step-acquisition with the fair value of the original investment immediately before the acquisition estimated to be approximately $3.5 million. As the fair value of the investment immediately prior to the transaction equaled the carrying value, there was no impact on the Company’s Consolidated Statements of Net Income. As the Securities Purchase Agreement includes an obligation of the Company to mandatorily redeem the non-controlling interest for cash, the fair value of the non-controlling interest was recognized as a liability on the Company’s Consolidated Balance Sheets. The original investment of $3.5 million, additional cash consideration of $14.2 million (net of cash acquired), and the non-cash consideration of the fair value of the commitment to purchase the non-controlling interest of $9.0 million resulted in a purchase price of $26.7 million. Changes in the fair value of the non-controlling interest are recognized in the Company’s Consolidated Statements of Net Income.

Commencing March 1, 2017, Monolith was reflected as a consolidated subsidiary within the Company’s Consolidated Financial Statements. Had the acquisition occurred as of January 1, 2017, the impact on the Company’s consolidated results of operations would not have been material.

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The following table summarizes the purchase price allocation of the fair value of assets acquired and liabilities assumed in the Monolith acquisition:

(in thousands) |  | Purchase Price Allocation |
Total purchase consideration: |  |  |  |
Original investment |  | $ | 3,500 |
Cash, net of cash acquired |  |  | 14,172 |
Non-cash, fair value of commitment to purchase non-controlling interest |  |  | 9,000 |
Total purchase consideration |  | $ | 26,672 |
Allocation of consideration to assets acquired and liabilities assumed: |  |  |  |
Current assets, net |  | $ | 891 |
Property, plant, and equipment |  |  | 789 |
Patented and unpatented technologies |  |  | 6,720 |
Non-compete agreement |  |  | 140 |
Goodwill |  |  | 20,641 |
Current liabilities |  |  | (639 | )
Other non-current liabilities |  |  | (1,870 | )
|  | $ | 26,672 |

Included in Monolith’s current assets, net was approximately $0.7 million of receivables. All Monolith goodwill, other assets and liabilities were recorded in the Electronics segment and reflected in the United States geographic area. The goodwill resulting from this acquisition consists largely of the Company’s expected future product sales and synergies from combining Monolith’s products and technology with the Company’s existing electronics product portfolio. Goodwill for the above acquisition is not expected to be deductible for tax purposes.

Pro Forma Results

The following table summarizes, on a pro forma basis, the combined results of operations of the Company and IXYS as though the acquisition had occurred as of January 1, 2017. The Company has not included pro forma results of operations for U.S. Sensor or Monolith as these results were not material to the Company. The pro forma amounts presented are not necessarily indicative of either the actual consolidated results had the IXYS acquisition occurred as of January 1, 2017 or of future consolidated operating results.

|  | For the Three Months Ended |
(in thousands, except per share amounts) |  | March 31, 2018 |  |  | April 1, 2017 |
Net sales |  | $ | 434,526 |  |  | $ | 368,813 |
Income before income taxes |  |  | 81,924 |  |  |  | 11,021 |
Net income |  |  | 63,933 |  |  |  | 17,462 |
Net income per share — basic |  |  | 2.57 |  |  |  | 0.70 |
Net income per share — diluted |  |  | 2.53 |  |  |  | 0.69 |

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Pro forma results presented above primarily reflect the following adjustments:

|  | For the Three Months Ended |
(in thousands) |  | March 31, 2018 |  |  | April 1, 2017 |
Amortization(a) |  | $ | 1,902 |  |  | $ | (6,276 | )
Depreciation |  |  | — |  |  |  | (94 | )
Transaction costs(b) |  |  | 9,976 |  |  |  | (9,976 | )
Amortization of inventory step-up(c) |  |  | 17,896 |  |  |  | (22,156 | )
Stock compensation(d) |  |  | 4,479 |  |  |  | (5,013 | )
Interest expense(e) |  |  | — |  |  |  | (2,582 | )
Income tax impact of above items |  |  | (7,701 | ) |  |  | 15,374 |

| (a) | The amortization adjustment for the three months ended March 31, 2018 primarily reflects the reduction of amortization expense in the period related to the Order backlog intangible asset. The Order backlog has a useful life of twelve months and will be fully amortized in the fiscal 2017 pro forma results. The amortization adjustment for the three months ended April 1, 2017 reflects incremental amortization resulting for the measurement of intangibles at their fair values.

| (b) | The transaction cost adjustments reflect the reversal of certain bank and attorney fees from the three months ended March 31, 2018 and recognition of those fees during the three months ended April 1, 2017.

| (c) | The amortization of inventory step-up adjustment reflects the reversal of the amount recognized during the three months ended March 31, 2018 and the recognition of a full quarter of the amortization during the three months end April 1, 2017. The inventory step-up is being amortized over five months as the inventory is sold.

| (d) | The stock compensation adjustment reflects the reversal of the portion of stock compensation for IXYS stock options that were converted to Littelfuse stock options and expensed immediately during the three months ended March 31, 2018. The adjustment for the three months ended April 1, 2017 reflect the incremental stock compensation for the converted stock options.

| (e) | The interest expense adjustment reflects incremental interest expense related to the financing of the transaction.

3. Inventories

The components of inventories at March 31, 2018 and December 30, 2017 are as follows:

(in thousands) |  | March 31, 2018 |  |  | December 30, 2017 |
Raw materials |  | $ | 66,259 |  |  | $ | 39,030 |
Work in process |  |  | 96,826 |  |  |  | 27,454 |
Finished goods |  |  | 100,884 |  |  |  | 74,305 |
Total |  | $ | 263,969 |  |  | $ | 140,789 |

4. Goodwill and Other Intangible Assets

The amounts for goodwill and changes in the carrying value by segment for the three months ended March 31, 2018 are as follows:

(in thousands) |  | Electronics |  |  | Automotive |  |  | Industrial |  |  | Total |
As of December 30, 2017 |  | $ | 278,959 |  |  | $ | 135,829 |  |  | $ | 38,626 |  |  | $ | 453,414 |
Additions(a) |  |  | 381,599 |  |  |  | — |  |  |  | — |  |  |  | 381,599 |
Currency translation |  |  | 2,455 |  |  |  | 3,195 |  |  |  | (89 | ) |  |  | 5,561 |
As of March 31, 2018 |  | $ | 663,013 |  |  | $ | 139,024 |  |  | $ | 38,537 |  |  | $ | 840,574 |

| (a) | The additions resulted from the acquisition of IXYS.

The components of other intangible assets at March 31, 2018 are as follows:

(in thousands, except weighted average useful life) |  | Weighted Average Useful Life |  |  | Gross Carrying Value |  |  | Accumulated Amortization |  |  | Net Book Value |
Patents, licenses and software |  | 10.6 |  |  |  | $ | 193,622 |  |  | $ | 64,012 |  |  | $ | 129,610 |
Distribution network |  | 12.6 |  |  |  |  | 44,473 |  |  |  | 33,434 |  |  |  | 11,039 |
Customer relationships, trademarks, and tradenames |  | 18.1 |  |  |  |  | 314,452 |  |  |  | 59,591 |  |  |  | 254,861 |
Order backlog |  | 1.0 |  |  |  |  | 12,400 |  |  |  | 2,504 |  |  |  | 9,896 |
Total |  |  |  |  |  | $ | 564,947 |  |  | $ | 159,541 |  |  | $ | 405,406 |

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During the three months ended March 31, 2018, the Company recorded additions to other intangible assets of $211.6 million, related to the IXYS acquisition, the components of which were as follows:

(in thousands, except weighted average useful life) |  | Weighted Average Useful Life |  |  | Amount |
Patents, licenses and software |  | 8.0 |  |  |  | $ | 51,500 |
Customer relationships, trademarks,and tradenames |  | 17.2 |  |  |  |  | 147,700 |
Order backlog |  | 1.0 |  |  |  |  | 12,400 |
Total |  |  |  |  |  | $ | 211,600 |

During the three months ended March 31, 2018 and April 1, 2017, the Company recorded amortization expense of $12.0 million and $5.9 million, respectively for intangible assets with definite lives.

Estimated annual amortization expense related to intangible assets with definite lives as of March 31, 2018 is as follows:

(in thousands) |  | Amount |
2018 |  | $ | 54,938 |
2019 |  |  | 42,005 |
2020 |  |  | 41,747 |
2021 |  |  | 39,928 |
2022 |  |  | 38,918 |
2023 and thereafter |  |  | 197,914 |
Total |  | $ | 415,450 |

5. Debt

The carrying amounts of debt at March 31, 2018 and December 30, 2017 are as follows:

(in thousands) |  | March 31, 2018 |  |  | December 30, 2017 |
Revolving Credit Facility |  | $ | 3,000 |  |  | $ | — |
Term Loan |  |  | 195,000 |  |  |  | 122,500 |
Euro Senior Notes, Series A due 2023 |  |  | 144,041 |  |  |  | 139,623 |
Euro Senior Notes, Series B due 2028 |  |  | 116,956 |  |  |  | 113,369 |
U.S. Senior Notes, Series A due 2022 |  |  | 25,000 |  |  |  | 25,000 |
U.S. Senior Notes, Series B due 2027 |  |  | 100,000 |  |  |  | 100,000 |
U.S. Senior Notes, Series A due 2025 |  |  | 50,000 |  |  |  | — |
U.S. Senior Notes, Series B due 2030 |  |  | 125,000 |  |  |  | — |
Other |  |  | 111 |  |  |  | — |
Unamortized debt issuance costs |  |  | (5,560 | ) |  |  | (4,881 | )
Total debt |  |  | 753,548 |  |  |  | 495,611 |
Less: Current maturities |  |  | (10,111 | ) |  |  | (6,250 | )
Total long-term debt |  | $ | 743,437 |  |  | $ | 489,361 |

Revolving Credit Facility / Term Loan

On March 4, 2016, the Company entered into a five-year credit agreement (“Credit Agreement”) with a group of lenders for up to $700.0 million. The Credit Agreement consisted of an unsecured revolving credit facility (“Revolving Credit Facility”) of $575.0 million and an unsecured term loan credit facility (“Term Loan”) of up to $125.0 million. In addition, the Company had the ability, from time to time, to increase the size of the Revolving Credit Facility and the Term Loan by up to an additional $150.0 million, in the aggregate, in each case in minimum increments of $25.0 million, subject to certain conditions and the agreement of participating lenders. For the Term Loan, the Company was required to make quarterly principal payments of $1.6 million through March 31, 2018 and $3.1 million from June 30, 2018 through December 31, 2020 with the remaining balance due on March 4, 2021.

On October 13, 2017, the Company amended the Credit Agreement to increase the Revolving Credit Facility from $575.0 million to $700.0 million and increase the Term Loan from $125.0 million to $200.0 million and to extend the expiration date from March 4, 2021 to October 13, 2022. The Credit Agreement also includes the option for the Company to increase the size of the Revolving Credit Facility and the Term Loan by up to an additional $300.0 million, in the aggregate, subject to the satisfaction of certain conditions set forth in the Credit Agreement. Term Loans may be made in up to two advances. The first advance of $125.0 million occurred on October 13, 2017 and the second advance of $75.0 million occurred on January 16, 2018. For the Term Loan, the Company is required to make quarterly principal payments of 1.25% of the original term loan ($2.5 million with the second advance on January 16, 2018) through maturity, with the remaining balance due on October 13, 2022.

Outstanding borrowings under the Credit Agreement bear interest, at the Company’s option, at either LIBOR, fixed for interest periods of one, two, three or six-month periods, plus 1.00% to 2.00%, or at the bank’s Base Rate, as defined, plus 0.00% to 1.00%, based upon the Company’s Consolidated Leverage Ratio, as defined. The Company is also required to pay commitment fees on unused portions of the credit agreement ranging from 0.15% to 0.25%, based on the Consolidated Leverage Ratio, as defined. The credit agreement includes representations, covenants and events of default that are customary for financing transactions of this nature. The effective interest rate on outstanding borrowings under the credit facility was 3.13% at March 31, 2018.

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As of March 31, 2018, the Company had $0.1 million outstanding in letters of credit and had available $696.9 million of borrowing capacity under the Revolving Credit Facility. At March 31, 2018, the Company was in compliance with all covenants under the Credit Agreement.

Senior Notes

On December 8, 2016, the Company entered into a Note Purchase Agreement, pursuant to which the Company issued and sold €212 million aggregate principal amount of senior notes in two series. The funding date for the Euro denominated senior notes occurred on December 8, 2016 for €117 million in aggregate amount of 1.14% Senior Notes, Series A, due December 8, 2023 (“Euro Senior Notes, Series A due 2023”), and €95 million in aggregate amount of 1.83% Senior Notes, Series B due December 8, 2028 (“Euro Senior Notes, Series B due 2028”) (together, the “Euro Senior Notes”). Interest on the Euro Senior Notes is payable semiannually on June 8 and December 8, commencing June 8, 2017.

On December 8, 2016, the Company entered into a Note Purchase Agreement, pursuant to which the Company issued and sold $125 million aggregate principal amount of senior notes in two series. On February 15, 2017, $25 million in aggregate principal amount of 3.03% Senior Notes, Series A, due February 15, 2022 (“U.S. Senior Notes, Series A due 2022”), and $100 million in aggregate principal amount of 3.74% Senior Notes, Series B, due February 15, 2027 (“U.S. Senior Notes, Series B due 2027”) (together, the “U.S. Senior Notes due 2022 and 2027”) were funded. Interest on the U.S. Senior Notes due 2022 and 2027 is payable semiannually on February 15 and August 15, commencing August 15, 2017.

On November 15, 2017, the Company entered into a Note Purchase Agreement pursuant to which the Company issued and sold $175 million in aggregate principal amount of senior notes in two series. On January 16, 2018, $50 million aggregate principal amount of 3.48% Senior Notes, Series A, due February 15, 2025 (“U.S. Senior Notes, Series A due 2025”) and $125 million in aggregate principal amount of 3.78% Senior Notes, Series B, due February 15, 2030 (“U.S. Senior Notes, Series B due 2030”) (together the “U.S. Senior Notes due 2025 and 2030” and with the Euro Senior Notes and the U.S. Senior Notes 2022 and 2027, the “Senior Notes”) were funded. Interest on the U.S. Senior Notes due 2025 and 2030 will be payable on February 15 and August 15, commencing on August 15, 2018.

The Senior Notes have not been registered under the Securities Act, or applicable state securities laws. The Senior Notes are general unsecured senior obligations and rank equal in right of payment with all existing and future unsecured unsubordinated indebtedness of the Company.

The Senior Notes are subject to certain customary covenants, including limitations on the Company’s ability, with certain exceptions, to engage in mergers, consolidations, asset sales and transactions with affiliates, to engage in any business that would substantially change the general business of the Company, and to incur liens. In addition, the Company is required to satisfy certain financial covenants and tests relating to, among other matters, interest coverage and leverage. At March 31, 2018, the Company was in compliance with all covenants under the Senior Notes.

The Company may redeem the Senior Notes upon the satisfaction of certain conditions and the payment of a make-whole amount to noteholders, and are required to offer to repurchase the Senior Notes at par following certain events, including a change of control.

6. Fair Value of Assets and Liabilities

For assets and liabilities measured at fair value on a recurring and nonrecurring basis, a three-level hierarchy of measurements based upon observable and unobservable inputs is used to arrive at fair value. Observable inputs are developed based on market data obtained from independent sources, while unobservable inputs reflect the Company’s assumptions about valuation based on the best information available in the circumstances. Depending on the inputs, the Company classifies each fair value measurement as follows:

Level 1—Valuations based on unadjusted quoted prices for identical assets or liabilities in active markets;

Level 2—Valuations based upon quoted prices for similar instruments, prices for identical or similar instruments in markets that are not active, or model-derived valuations, all of whose significant inputs are observable, and

Level 3—Valuations based upon one or more significant unobservable inputs.

Following is a description of the valuation methodologies used for instruments measured at fair value and their classification in the valuation hierarchy.

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Investments in Equity Securities

Investments in equity securities listed on a national market or exchange are valued at the last sales price and classified within Level 1 of the valuation hierarchy.

Mutual Funds

The Company has a non-qualified Supplemental Retirement and Savings Plan which provides additional retirement benefits for certain management employees and named executive officers by allowing participants to defer a portion of their annual compensation. The Company maintains accounts for participants through which participants make investment elections. The marketable securities are classified as Level 1 under the fair value hierarchy as they are maintained in mutual funds with readily determinable fair value.

There were no changes during the quarter ended March 31, 2018 to the Company’s valuation techniques used to measure asset and liability fair values on a recurring basis. As of March 31, 2018 and December 30, 2017, the Company did not hold any non-financial assets or liabilities that are required to be measured at fair value on a recurring basis.

The following table presents assets measured at fair value by classification within the fair value hierarchy as of March 31, 2018:

|  | Fair Value Measurements Using |  |  |  |  |
(in thousands) |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |  |  | Total |
Investments in equity securities |  | $ | 14,754 |  |  | $ | — |  |  | $ | — |  |  | $ | 14,754 |
Mutual funds |  |  | 9,852 |  |  |  | — |  |  |  | — |  |  |  | 9,852 |

The following table presents assets measured at fair value by classification within the fair value hierarchy as of December 30, 2017:

|  | Fair Value Measurements Using |  |  |  |  |
(in thousands) |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |  |  | Total |
Investments in equity securities |  | $ | 10,993 |  |  | $ | — |  |  | $ | — |  |  | $ | 10,993 |
Mutual funds |  |  | 7,962 |  |  |  | — |  |  |  | — |  |  |  | 7,962 |

In addition to the methods and assumptions used for the financial instruments recorded at fair value as discussed above, the following methods and assumptions are used to estimate the fair value of other financial instruments that are not marked to market on a recurring basis. The Company’s other financial instruments include cash and cash equivalents, short-term investments, accounts receivable and its long-term debt. Due to their short-term maturity, the carrying amounts of cash and cash equivalents, short-term investments and accounts receivable approximate their fair values. The Company’s revolving and term loan debt facilities’ fair values approximate book value at March 31, 2018 and December 30, 2017, as the rates on these borrowings are variable in nature.

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The carrying value and estimated fair values of the Company’s Euro Senior Notes, Series A and Series B and USD Senior Notes, Series A and Series B, as of September 30, 2017 and December 31, 2016 were as follows:

|  | March 31, 201 8 |  |  | December 30, 201 7 |
(in thousands) |  | Carrying Value |  |  | Estimated Fair Value |  |  | Carrying Value |  |  | Estimated Fair Value |
Euro Senior Notes, Series A due 2023 |  | $ | 144,041 |  |  | $ | 142,038 |  |  | $ | 139,623 |  |  | $ | 138,294 |
Euro Senior Notes, Series B due 2028 |  |  | 116,956 |  |  |  | 113,953 |  |  |  | 113,369 |  |  |  | 111,579 |
USD Senior Notes, Series A due 2022 |  |  | 25,000 |  |  |  | 24,301 |  |  |  | 25,000 |  |  |  | 24,737 |
USD Senior Notes, Series B due 2027 |  |  | 100,000 |  |  |  | 96,475 |  |  |  | 100,000 |  |  |  | 99,992 |
USD Senior Notes, Series A due 2025 |  |  | 50,000 |  |  |  | 48,081 |  |  |  | — |  |  |  | — |
USD Senior Notes, Series B due 2030 |  |  | 125,000 |  |  |  | 118,303 |  |  |  | — |  |  |  | — |

7. Benefit Plans

The Company has company-sponsored defined benefit pension plans covering employees in the U.K., Germany, the Philippines, China, Japan, and France. The amount of the retirement benefits provided under the plans is based on years of service and final average pay.

The Company recognizes interest costs, expected return on plan assets, and amortization, net within Other (income) expense, net in the Condensed Consolidated Statements of Net Income. The components of net periodic benefit cost for the three months ended March 31, 2018 and April 1, 2017 were as follows:

|  | For the Three Months Ended |
(in thousands) |  | March 31, 201 8 |  |  | April 1, 201 7 |
Components of net periodic benefit cost: |  |  |  |  |  |  |  |
Service cost |  | $ | 533 |  |  | $ | 408 |
Interest cost |  |  | 501 |  |  |  | 360 |
Expected return on plan assets |  |  | (540 | ) |  |  | (476 | )
Amortization, net |  |  | 74 |  |  |  | 84 |
Net periodic benefit cost |  | $ | 568 |  |  | $ | 376 |

The Company expects to make approximately $2.3 million of cash contributions to its pension plans in 2018.

8. Shareholders’ Equity

The following table sets forth the changes in shareholders’ equity for the three months ended March 31, 2018:

(in thousands) |  | Littelfuse, Inc. Shareholders’ Equity |  |  | Non- controlling Interest |  |  | Total |
Balance at December 30, 2017 |  | $ | 927,419 |  |  | $ | 137 |  |  | $ | 927,556 |
Net income |  |  | 36,029 |  |  |  | — |  |  |  | 36,029 |
Other comprehensive income |  |  | (279 | ) |  |  | — |  |  |  | (279 | )
Stock-based compensation |  |  | 8,714 |  |  |  | — |  |  |  | 8,714 |
Withheld shares on restricted share units for withholding taxes |  |  | (2,758 | ) |  |  | — |  |  |  | (2,758 | )
Stock options exercised |  |  | 9,609 |  |  |  | — |  |  |  | 9,609 |
Issuance of common stock(a) |  |  | 472,301 |  |  |  | — |  |  |  | 472,301 |
Cash dividends paid ($0.37 per share) |  |  | (9,198 | ) |  |  | — |  |  |  | (9,198 | )
Non-controlling interest |  |  | — |  |  |  | — |  |  |  | — |
Balance at March 31, 2018 |  | $ | 1,441,837 |  |  | $ | 137 |  |  | $ | 1,441,974 |

(a) The issuance of common stock (2,092,491 shares) during the three months ended March 31, 2018 relates to the acquisition of IXYS. See Note 2, Acquisitions for further discussion.

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The following table sets forth the changes in the components of Accumulated Other Comprehensive Income (Loss) by component for the three months ended March 31, 2018:

(in thousands) |  | Pension and postretirement liability and reclassification adjustments (a) |  |  | Unrealized g ain/(loss) on investments |  |  | Foreign currency translation adjustment |  |  | Accumulated other comprehensive income (loss) |
Balance at December 30, 2017 |  | $ | (10,836 | ) |  | $ | 9,795 |  |  | $ | (62,627 | ) |  | $ | (63,668 | )
Cumulative effect adjustment (b) |  |  | — |  |  |  | (9,795 | ) |  |  | — |  |  |  | (9,795 | )
Activity in the period |  |  | (3 | ) |  |  | — |  |  |  | (276 | ) |  |  | (279 | )
Balance at March 31, 2018 |  | $ | (10,839 | ) |  | $ | — |  |  | $ | (62,903 | ) |  | $ | (73,742 | )

(a) The balances at March 31, 2018 and December 30, 2017 are net of taxes of $0.2 million and $1.4 million, respectively.

(b) The Company adopted ASU 2016-01 on December 31, 2018 on a modified retrospective basis, recognizing the cumulative effect as a $9.8 million increase to retained earnings. See Note 1, Summary of Significant Accounting Policies and Other Information, for further discussion.

9. Income Taxes

The effective tax rate for the first quarter of 2018 was 19.3% compared to an effective tax rate of 18.0% in the first quarter of 2017. The effective tax rate for the first quarter of 2017 was lower than the then applicable 35% U.S. statutory tax rate primarily due to income earned in lower tax jurisdictions.

On December 22, 2017, the U.S. enacted legislation commonly referred to as the Tax Cuts and Jobs Act (the "Tax Act"). Among other things, the Tax Act reduces the U.S. corporate federal income tax rate from 35% to 21%, adds base broadening provisions which limit deductions and address excessive international tax planning, imposes a one-time tax (the “Toll Charge”) on accumulated earnings of certain non-U.S. subsidiaries and enables repatriation of earnings of non-U.S. subsidiaries free of U.S. federal income tax. Other than the Toll Charge (which, except for the IXYS impact, is applicable to the Company for 2017), the provisions will generally be applicable to the Company in 2018 and beyond.

In accordance with the guidance provided in SEC Staff Accounting Bulletin (“SAB”) No. 118, in the fourth quarter of 2017 the Company recorded a charge of $47 million as a provisional reasonable estimate of the impact of the Tax Act, including $49 million for the Toll Charge net of $2 million for other net tax benefits. The Company did not adjust the provisional reasonable estimate in the first quarter of 2018. In addition, the Company recorded a preliminary estimate of $10 million for the toll charge associated with the acquisition of IXYS. This adjustment was reflected in the opening balance sheet as an increase to goodwill and other long-term liabilities. The Company is continuing to analyze the Tax Act and plans to finalize the estimate within the measurement period outlined in SAB No. 118. The final charge may differ from the provisional reasonable estimate if provisions of the Tax Act, and their interaction with other provisions of the U.S. Internal Revenue Code, are interpreted differently than interpretations made by the Company in determining the estimate, whether through issuance of administrative guidance, or through further review of the Tax Act by the Company and its advisors. Aside from these interpretation issues, the final charge may differ from the provisional reasonable estimate due to refinements of accumulated non-U.S. earnings and tax pool data.

The Company recognized deferred tax liabilities of $12.0 million ($11.8 million for non-U.S. taxes and $0.2 million for U.S. state taxes) as of December 30, 2017 related to taxes on certain non-U.S. earnings which are not considered to be permanently reinvested. Some of these taxes may provide a U.S. federal income tax benefit as a foreign tax credit. However, due to uncertainty in regard to the Tax Act’s provisions, no such tax benefit was recorded as of December 30, 2017, and no such tax benefit was recorded in the first quarter of 2018. The Company will reconsider this provisional conclusion when it finalizes its preliminary reasonable estimate of the impact of the Tax Act, based upon interpretations and administrative guidance as of that time.

One of the base broadening provisions of the Tax Act is commonly referred to as the “GILTI” provisions. In accordance with guidance issued by the FASB staff, the Company has not adopted an accounting policy for GILTI. Thus, deferred taxes were computed without consideration of the possible future impact of the GILTI provisions. The Company intends to adopt an accounting policy for GILTI within the measurement period outlined in SAB 118. Although such an accounting policy has not been adopted, the Company considered GILTI when determining the current portion of income tax expense recorded for the first quarter of 2018.

Although certain administrative guidance has been issued, the appropriate application of many provisions of the Tax Act remain uncertain. The Company used its best judgement as to the application of these provisions in determining its income tax expense for the first quarter of 2018.

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10. Earnings Per Share

The following table sets forth the computation of basic and diluted earnings per share:

|  | For the Three Months Ended |
(in thousands, except per share amounts) |  | March 31, 201 8 |  |  | April 1, 201 7 |
Numerator: |  |  |  |  |  |  |  |
Net income as reported |  | $ | 36,029 |  |  | $ | 38,891 |
Denominator: |  |  |  |  |  |  |  |
Weighted average shares outstanding |  |  |  |  |  |  |  |
Basic |  |  | 24,339 |  |  |  | 22,748 |
Effect of dilutive securities |  |  | 436 |  |  |  | 241 |
Diluted |  |  | 24,775 |  |  |  | 22,989 |
Earnings Per Share: |  |  |  |  |  |  |  |
Basic earnings per share |  | $ | 1.48 |  |  | $ | 1.71 |
Diluted earnings per share |  | $ | 1.45 |  |  | $ | 1.69 |

No potential shares of common stock attributable to stock options were excluded from the diluted earnings per share calculation for the three months ended March 31, 2018 and April 1, 2017, respectively.

11. Related Party Transactions

As a result of the Company’s acquisition of IXYS, the Company has equity ownerships in various investments that are accounted for under the equity method. The following is a description of the investments and related party transactions.

Powersem GmbH: The Company owns 45% of the outstanding equity of Powersem GmbH (“Powersem”), a module manufacturer based in Germany. During the three months ended March 31, 2018, the Company recorded revenues of $0.1 million from sales of products to Powersem for use as components in their products. During the three months ended March 31, 2018, the Company purchased $1.1 million of products from Powersem. At March 31, 2018, the accounts receivable balance from Powersem was $0.1 million and the accounts payable balance to Powersem was $0.3 million.

EB Tech Ltd.: The Company owns approximately 20% of the outstanding equity of EB Tech Ltd. (“EB Tech”), a company with expertise in radiation technology based in South Korea. During the three months ended March 31, 2018 EB Tech rendered processing services for the Company totaling approximately $0.1 million. As of March 31, 2018, the Company’s accounts payable balance to EB Tech was immaterial.

Automated Technology, Inc.: The Company owns approximately 24% of the outstanding common shares of Automated Technology, Inc (“ATEC”), a supplier located in the Philippines that provides assembly and test services. During the three months ended March 31, 2018, ATEC rendered assembly and test services to the Company totaling approximately $2.4 million. As of March 31, 2018, the Company’s accounts payable balance to ATEC was $0.8 million.

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1 2. Segment Information

The Company and its subsidiaries design, manufacture and sell components and modules for circuit protection, power control and sensing throughout the world. The Company reports its operations by the following segments: Electronics, Automotive, and Industrial. An operating segment is defined as a component of an enterprise that engages in business activities from which it may earn revenues and incur expenses, and about which separate financial information is regularly evaluated by the Chief Operating Decision Maker (“CODM”) in deciding how to allocate resources. The CODM is the Company’s President and Chief Executive Officer (“CEO”). The CODM allocates resources to and assesses the performance of each operating segment using information about its revenue and operating income (loss) before interest and taxes, but does not evaluate the operating segments using discrete balance sheet information.

Sales, marketing, and research and development expenses are charged directly into each operating segment. Manufacturing, purchasing, logistics, customer service, finance, information technology, and human resources are shared functions that are allocated back to the three operating segments. The Company does not report inter-segment revenue because the operating segments do not record it. Certain expenses, determined by the CODM to be strategic in nature and not directly related to segments current results, are not allocated but identified as “Other”. Additionally, the Company does not allocate interest and other income, interest expense, or taxes to operating segments. These costs are not allocated to the segments, as management excludes such costs when assessing the performance of the segments. Although the CODM uses operating income (loss) to evaluate the segments, operating costs included in one segment may benefit other segments. Except as discussed above, the accounting policies for segment reporting are the same as for the Company as a whole.

| ● | Electronics Segment: Consists of one of the broadest product offerings in the industry, including fuses and fuse accessories, positive temperature coefficient (“PTC”) resettable fuses, polymer electrostatic discharge (“ESD”) suppressors, varistors, gas discharge tubes; semiconductor and power semiconductor products such as discrete transient voltage suppressor (“TVS”) diodes, TVS diode arrays, protection and switching thyristors, silicon carbide, metal-oxide-semiconductor field-effect transistors (“MOSFETs”) and silicon carbide diodes; and insulated gate bipolar transistors (“IGBT”) technologies. The segment covers a broad range of end markets, including consumer electronics, automotive electronics, IT and telecommunications equipment, medical devices, lighting products, and white goods.

| ● | Automotive Segment: Consists of a wide range of circuit protection, power control and sensing technologies for global original equipment manufacturers (“OEMs”), Tier-I suppliers and parts distributors in the automotive, commercial vehicle, and agricultural and construction equipment industries. Passenger car fuse products include fuses and fuse accessories, including blade fuses, battery cable protectors, varistors, high-current fuses, and high-voltage fuses for hybrid and electric vehicles. Commercial vehicle products include fuses, switches, relays, and power distribution modules for the commercial vehicle industry. Automotive sensor products include a wide range of automotive and commercial vehicle sensors designed to monitor the passenger compartment occupants and environment as well as the vehicle’s powertrain, emissions, speed and suspension.

| ● | Industrial Segment: Consists of power fuses, protection relays and controls and other circuit protection products for use in heavy industrial applications such as mining, oil and gas, energy storage, construction, HVAC systems, elevator and other industrial equipment.

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Segment information is summarized as follows:

|  | For the Three Months Ended |
(in thousands) |  | March 31, 201 8 |  |  | April 1, 201 7 |
Net sales |  |  |  |  |  |  |  |
Electronics |  | $ | 264,411 |  |  | $ | 153,767 |
Automotive |  |  | 126,131 |  |  |  | 107,839 |
Industrial |  |  | 27,271 |  |  |  | 23,835 |
Total net sales |  | $ | 417,813 |  |  | $ | 285,441 |
Depreciation and amortization |  |  |  |  |  |  |  |
Electronics |  | $ | 13,678 |  |  | $ | 8,387 |
Automotive |  |  | 5,970 |  |  |  | 5,371 |
Industrial |  |  | 1,460 |  |  |  | 1,314 |
Other |  |  | 2,504 |  |  |  | — |
Total depreciation and amortization |  | $ | 23,612 |  |  | $ | 15,072 |
Operating income (loss) |  |  |  |  |  |  |  |
Electronics |  | $ | 53,964 |  |  | $ | 35,206 |
Automotive |  |  | 18,390 |  |  |  | 15,065 |
Industrial |  |  | 4,709 |  |  |  | 106 |
Other(a) |  |  | (39,492 | ) |  |  | (1,525 | )
Total operating income |  |  | 37,571 |  |  |  | 48,852 |
Interest expense |  |  | 5,423 |  |  |  | 3,120 |
Foreign exchange loss (gain) |  |  | (10,555 | ) |  |  | (1,557 | )
Other income, net |  |  | (1,943 | ) |  |  | (139 | )
Income before income taxes |  | $ | 44,646 |  |  | $ | 47,428 |

(a) For the first quarter of 2018, “Other” Operating income (loss) of $39.5 million consists of $38.6 million in acquisition and integration costs associated with the Company’s 2018 acquisition of IXYS ($18.4 million included in Cost of sales (“COS”), of which $17.9 million relates to fair value inventory adjustments, $16.1 million included in Selling, general, and administrative expenses (“SG&A), $1.6 million in Research and development (“R&D”) $2.5 million in backlog amortization expense), $0.8 million in restructuring costs ($0.5 million included in COS and $0.3 million in SG&A) and $0.1 million in year acquisition and integration costs associated with the Company’s 2017 acquisitions in SG&A.

For the first quarter of 2017, “Other” Operating income (loss) of $1.5 million consists of acquisition and integration costs associated with the Company’s 2016 acquisitions (included in COS and SG&A).

The Company’s net sales by country were as follows:

|  | For the Three Months Ended |
(in thousands) |  | March 31, 2018 |  |  | April 1, 2017 |
Net sales |  |  |  |  |  |  |  |
United States |  | $ | 123,877 |  |  | $ | 86,658 |
China(a) |  |  | 106,508 |  |  |  | 78,219 |
Other countries(b) |  |  | 187,428 |  |  |  | 120,564 |
Total net sales |  | $ | 417,813 |  |  | $ | 285,441 |

(a) Includes mainland China, Taiwan, and Hong Kong.

(b) Each country included in Other countries are less than 10% of net sales.

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The Company’s long-lived assets by country, as of March 31, 2018 and April 1, 2017, were as follows:

(in thousands) |  | March 31, 2018 |  |  | December 30, 2017 |
Long-lived assets |  |  |  |  |  |  |  |
United States |  | $ | 49,132 |  |  | $ | 23,490 |
China(a) |  |  | 91,676 |  |  |  | 86,866 |
Mexico |  |  | 64,176 |  |  |  | 62,510 |
Germany |  |  | 36,232 |  |  |  | 1,082 |
Philippines |  |  | 30,734 |  |  |  | 31,129 |
Other countries |  |  | 65,255 |  |  |  | 45,500 |
Total long-lived assets |  | $ | 337,205 |  |  | $ | 250,577 |

(a) Includes mainland China, Taiwan, and Hong Kong.

The Company’s additions to long-lived assets by country were as follows:

|  | For the Three Months Ended |
(in thousands) |  | March 31, 2018 |  |  | April 1, 2017 |
Additions to long-lived assets |  |  |  |  |  |  |  |
United States |  | $ | 2,909 |  |  | $ | 332 |
China(a) |  |  | 5,144 |  |  |  | 2,392 |
Mexico |  |  | 3,310 |  |  |  | 6,978 |
Germany |  |  | 3,038 |  |  |  | 45 |
Philippines |  |  | 2,162 |  |  |  | 855 |
Other countries |  |  | 1,346 |  |  |  | 1,775 |
Total additions to long-lived assets |  | $ | 17,909 |  |  | $ | 12,377 |

(a) Includes mainland China, Taiwan, and Hong Kong.

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

Cautionary Statement Regarding Forward-Looking Statements Under the Private Securities Litigation Reform Act of 1995 (“PSLRA”).

Certain statements in this section and other parts of this Quarterly Report on Form 10-Q may constitute "forward-looking statements" within the meaning of the federal securities laws and are entitled to the safe-harbor provisions of the PSLRA. These statements include statements regarding the Company’s future performance, as well as management's expectations, beliefs, intentions, plans, estimates or projections relating to the future. Such statements can be identified by the use of forward-looking terminology such as "believes," "expects," "may," "estimates," "will," "should," "plans" or "anticipates" or the negative thereof or other variations thereon or comparable terminology, or by discussions of strategy, although not all forward-looking statements contain such terms. The Company cautions that forward-looking statements, which speak only as of the date they are made, are subject to risks, uncertainties and other factors, and actual results and outcomes may differ materially from those indicated or implied by the forward-looking statements. These risks, uncertainties and other factors include, but are not limited to, risks relating to product demand and market acceptance; economic conditions; the impact of competitive products and pricing; product quality problems or product recalls; capacity and supply difficulties or constraints; coal mining exposures reserves; failure of an indemnification for environmental liability; exchange rate fluctuations; commodity price fluctuations; the effect of the Company's accounting policies; labor disputes; restructuring costs in excess of expectations; pension plan asset returns less than assumed; uncertainties related to political or regulatory changes; the risk that expected benefits, synergies and growth prospects of the Company’s completed acquisition of IXYS Corporation (“IXYS”) may not be achieved in a timely manner, or at all; the risk that IXYS’ business may not be successfully integrated with the Company’s; the risk that the Company and IXYS will be unable to retain and hire key personnel; and the risk that disruption from the acquisition may adversely affect the Company’s or IXYS’ business and their respective relationships with customers, suppliers or employees; and other risks which may be detailed in the Company's other Securities and Exchange Commission filings, including those set forth under Item 1A. "Risk Factors" of the Company's Annual Report on Form 10-K for the year ended December 30, 2017. The Company does not undertake any obligation to update or revise any forward-looking statements to reflect future events or circumstances, new information or otherwise.

This report, including the Management’s Discussion and Analysis of Financial Condition and Results of Operations, should be read in conjunction with information provided in the consolidated financial statements and the related Notes thereto appearing in the Company's Annual Report on Form 10-K for the year ended December 30, 2017.

Management’s Discussion and Analysis of Financial Condition and Results of Operations ("MD&A") is designed to provide information that is supplemental to, and should be read together with, the consolidated financial statements and the accompanying notes. Information in MD&A is intended to assist the reader in obtaining an understanding of (i) the consolidated financial statements, (ii) the changes in certain key items within those financial statements from year-to-year, (iii) the primary factors that contributed to those changes, and (iv) any changes in known trends or uncertainties that we are aware of and that may have a material effect on future performance. In addition, MD&A provides information about the Company’s segments and how the results of those segments impact the results of operations and financial condition as a whole.

Executive Overview

Founded in 1927, Littelfuse is a global leader in circuit protection products with advancing platforms in power control and sensor technologies, serving customers in the electronics, automotive, and industrial markets. With a diverse and extensive product portfolio of fuses, semiconductors, polymers, ceramics, relays and sensors, the Company works with its customers to build safer, more reliable and more efficient products for the connected world in virtually every market that uses electrical energy, ranging across consumer electronics, IT and telecommunication applications, industrial electronics, automobiles and other transportation, and heavy industrial applications

The company maintains a network of global laboratories and engineering centers that develop new products and product enhancements, provide customer application support and test products for safety, reliability, and regulatory compliance. The Company conducts its business through three reportable segments: Electronics, Automotive, and Industrial. For each of these segments, the Company designs, manufactures and sells circuit protection products that protect against electrostatic discharge, power surges, short circuits, voltage spikes and other harmful occurrences; power control products that safely and efficiently control power to mitigate equipment damage, minimize electrical hazards and improve productivity; and sensor products used to identify and detect temperature, proximity, flow speed and fluid level in various applications. The Company’s customer base includes OEMs, Tier One automotive suppliers, and distributors.

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Executive Summary

For the first quarter of 2018, the Company recognized net sales of $417.8 million compared to $285.4 million in the first quarter of 2017 representing an increase of $132.4 million, or 46.4%. The increase was primarily driven by the acquisition of IXYS along with higher volume across all three segments. Net sales for Electronics increased $110.6 million, or 72.0%, due to the acquisition of IXYS and U.S. Sensor and strong growth across all the business units and geographic regions. Net sales for the Automotive segment increased $18.3 million, or 17.0% due to volume growth across all the segment’s business units and geographic regions. Net sales in the Industrial segment increased $3.4 million or 14.4% due to volume growth in the power fuse and relay businesses. The Company recognized net income of $36.0 million, or $1.45 per diluted share, in the first quarter of 2018 compared to net income of $38.9 million, or $1.69 per diluted share in the first quarter of 2017. The decrease in net income reflects the impact of the acquisition and integration related costs of $39.5 million associated with the IXYS acquisition that were mostly offset by operating income increases across all three segments and foreign exchange gains. Additionally, the per share results reflect an increase in the weighted average diluted shares outstanding of 1.5 million as a result of the shares issued in conjunction with the acquisition of IXYS.

Net cash provided by operating activities was $69.3 million for the three months ended March 31, 2018 as compared to $22.9 million for the three months ended April 1, 2017. The increase in net cash provided by operating activities reflected higher earnings and favorable working capital management that more than offset higher payments related to acquisition and integration costs.

On January 17, 2018, the Company completed its acquisition of IXYS for total purchase consideration of $778.8 million, net of cash acquired. IXYS is a global pioneer in the power semiconductor and integrated circuit markets with a focus on medium to high voltage power control semiconductors across the industrial, communications, consumer and medical markets. IXYS has a broad customer base, serving more than 3,500 customers through its direct salesforce and global distribution partners.

Results of Operations

The following table summarizes the Company’s consolidated results of operations for the periods presented. The first quarter of 2018 includes $39.5 million of non-segment charges. The charges related to the IXYS acquisition total $38.6 million and include $17.9 million of purchase accounting inventory charges, $11.7 million in acquisition-related and integration costs primarily related to legal, accounting and other expenses associated with the acquisition of IXYS, $4.5 million of stock compensation expense recognized immediately upon close for converted IXYS options related to prior services periods $2.5 million in backlog amortization costs and $2.1 million in other charges. In addition, there were $0.8 million of restructuring charges related to certain operations in the Electronics segment.

The first quarter of 2017 includes approximately $1.5 million of non-segment charges. These were primarily attributable to acquisition-related costs primarily related to legal and integration costs associated with the Company’s acquisitions in 2016 of the ON Portfolio and PolySwitch.

|  | First Quarter |  |  |  |  |  |  |  |  |
(in thousands) |  | 2018 |  |  | 2017 |  |  | Change |  |  | % Change |
Sales |  | $ | 417,813 |  |  | $ | 285,441 |  |  | $ | 132,372 |  |  |  | 46.4 | %
Gross profit |  |  | 149,623 |  |  |  | 113,650 |  |  |  | 35,973 |  |  |  | 31.7 | %
Operating expenses |  |  | 112,052 |  |  |  | 64,798 |  |  |  | 47,254 |  |  |  | 72.9 | %
Operating income |  |  | 37,571 |  |  |  | 48,852 |  |  |  | (11,281 | ) |  |  | (23.1 | %)
Other (income) expense, net |  |  | (1,943 | ) |  |  | (139 | ) |  |  | 1,804 |  |  |  | N.M. |
Income before income taxes |  |  | 44,646 |  |  |  | 47,428 |  |  |  | (2,782 | ) |  |  | (5.9 | %)
Net income |  |  | 36,029 |  |  |  | 38,891 |  |  |  | (2,862 | ) |  |  | (7.4 | )

N.M. - Not meaningful

Net Sales

Net sales increased $132.4 million, or 46.4%, for the first quarter of 2018 compared to the first quarter of 2017 with increases of $86.3 million and $3.1 million resulting from incremental net sales related to the IXYS and U.S Sensor acquisitions, respectively. The remaining increase in net sales was driven by higher volume across all businesses in the Electronics segment and Automotive segments as well as increases in the fuse and relay businesses in the Industrial segment.

Gross Profit

Gross profit was $149.6 million, or 35.8% of net sales, in the first quarter of 2018, compared to $113.7 million, or 39.8% of net sales in the first quarter of 2017. The increase in gross profit reflects the lower gross profit of the IXYS acquisition and volume growth and expense leverage across all segments. The decrease in gross margin is due to the purchase accounting inventory charges of $17.9 million which negatively impacted the first quarter of 2018 gross margin by 4.3 percentage points.

Operating Expenses

Total operating expenses were $112.1 million, or 26.8% of net sales, for the first quarter of 2018 compared to $64.8 million, or 22.7% of net sales, for the first quarter of 2017. The increase in operating expenses of $47.3 million is primarily due to incremental operating expenses related to the IXYS and US Sensor acquisitions as well as higher acquisition-related and integration costs of $20.1 million and an increase in amortization expense of $6.1 million resulting from the acquisition of IXYS.

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Operating Income

Operating income was $37.6 million, a decrease of $11.3 million or 23.1% for the first quarter of 2018 compared to $48.9 million for the first quarter of 2017. The decrease in operating income is primarily due to the purchase accounting inventory charges of $17.9 million along with the costs associated with the acquisition and integration of the IXYS acquisition as described above. Operating margins decreased from 17.1% in the first quarter of 2017 to 9.0% in the first quarter of 2018. The higher acquisition and integration charges negatively impacted operating margins by 9.0% in the first quarter of 2018.

Income Before Income Taxes

Income before income taxes was $44.6 million, or 10.7% of net sales, for the first quarter of 2018 compared to $47.4 million, or 16.6% of net sales, for the first quarter of 2017. In addition to the factors impacting comparative results for operating income, income before income taxes was impacted by favorable comparative foreign exchange gains that were partially offset by increased interest expense associated with the increased borrowings for the IXYS acquisition. The effect of foreign exchange rate changes on various foreign currency transactions worldwide was approximately $10.6 million of unrealized income for the first quarter of 2018 compared to income of unrealized $1.6 million for the first quarter of 2017 primarily due to fluctuations in the euro and Philippine peso against the U.S. dollar. Interest expense increased $2.3 million in the first quarter of 2018 primarily reflecting increased borrowings. Additionally, other income increased by $1.9 million as a result of unrealized investment gains, primarily associated with our investment in Polytronics.

Income Taxes

Income tax expense was $8.6 million, or an effective tax rate of 19.3%, for the first quarter of 2018 compared to $8.5 million, or an effective tax rate of 18.0%, for the first quarter of 2017. The effective tax rate for the first quarter of 2017 was lower than the then applicable 35% U.S. statutory tax rate primarily due to income earned in lower tax jurisdictions.

Segment Results of Operations

The Company reports its operations by the following segments: Electronics, Automotive and Industrial. Segment information is described more fully in Note 12, Segment Information, of the Notes to the Condensed Consolidated Financial Statements included in this Quarterly Report.

The following table provides a summary of the Company’s net sales by segment:

|  | First Quarter |  |  |  |  |  |  |  |  |
(in thousands) |  | 2018 |  |  | 2017 |  |  | Change |  |  | % Change |
Electronics |  | $ | 264,411 |  |  | $ | 153,767 |  |  | $ | 110,644 |  |  |  | 72.0 | %
Automotive |  |  | 126,131 |  |  |  | 107,839 |  |  |  | 18,292 |  |  |  | 17.0 | %
Industrial |  |  | 27,271 |  |  |  | 23,835 |  |  |  | 3,436 |  |  |  | 14.4 | %
Electronics |  | $ | 417,813 |  |  | $ | 285,441 |  |  | $ | 132,372 |  |  |  | 46.4 | %

Electronics Segment

The Electronics segment net sales increased $110.6 million, or 72.0%, in the first quarter of 2018 compared to the first quarter of 2017 due to incremental net sales related to the IXYS and U.S. Sensor acquisitions of $86.3 million and $3.1 million, respectively, higher volume across all businesses driven by the strong electronics cycle and favorable foreign exchange impacts of $5.3 million.

Automotive Segment

The Automotive segment net sales increased $18.3 million, or 17.0%, in the first quarter of 2018 compared to the first quarter of 2017 due to increased volume across all businesses with the commercial vehicle business having the most growth as well as favorable changes in foreign exchange rates of $7.4 million.

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Industrial Segment

The Industrial segment net sales increased $3.4 million, or 14.4%, in the first quarter of 2018 compared to the first quarter of 2017 primarily due to higher volume in the power fuse and relay operations partially offset by lower volume in the custom products business.

Geographic Net Sales Information

Net sales by geography represent net sales to customer or distributor locations. The following table is a summary of the Company’s net sales by geography:

|  | First Quarter |  |  |  |  |  |  |  |  |
(in thousands) |  | 2018 |  |  | 2017 |  |  | Change |  |  | % Change |
Americas |  | $ | 138,729 |  |  | $ | 98,025 |  |  | $ | 40,704 |  |  |  | 41.5 | %
Europe |  |  | 99,812 |  |  |  | 58,905 |  |  |  | 40,907 |  |  |  | 69.4 | %
Asia-Pacific |  |  | 179,272 |  |  |  | 128,511 |  |  |  | 50,761 |  |  |  | 39.5 | %
Total |  | $ | 417,813 |  |  | $ | 285,441 |  |  | $ | 132,372 |  |  |  | 46.4 | %

Americas

Net sales in the Americas increased $40.7 million, or 41.5%, in the first quarter of 2018 compared to the first quarter of 2017 driven by incremental sales from IXYS and U.S. Sensor acquisitions and increased volume across all businesses in the Electronics, Automotive and Industrial segments.

Europe

European net sales increased $40.9 million, or 69.4%, in the first quarter of 2018 compared to the first quarter of 2017. The increase in net sales was primarily due to incremental sales from the IXYS acquisition and higher volumes across all businesses in the Electronics and Automotive segments and the relay business in the Industrial segment as well as favorable foreign currency effects of $9.5 million.

Asia-Pacific

Asia-Pacific net sales increased $50.8 million, or 39.5%, in the first quarter of 2018 compared to the first quarter of 2017 primarily due to incremental net sales from current year and prior year acquisitions and higher net sales in all of the Electronics and Automotive segments’ businesses as well as favorable foreign currency effects of $3.1 million.

Liquidity and Capital Resources

The Company has historically supported its liquidity needs through cash flows from operations. Management expects that the Company’s (i) current level of cash, cash equivalents, and marketable securities, (ii) current and forecasted cash flows from operations, (iii) availability under existing funding arrangements, and (iv) access to capital in the capital markets will provide sufficient funds to support the Company’s operations, capital expenditures, investments, and debt obligations on both a short-term and long-term basis.

Revolving Credit Facility/Term Loan

On March 4, 2016, the Company entered into a new five-year credit agreement with a group of lenders for up to $700.0 million. The new credit agreement consists of an unsecured revolving credit facility of $575.0 million and an unsecured term loan credit facility of up to $125.0 million. In addition, the Company has the ability, from time to time, to increase the size of the revolving credit facility and the term loan facility by up to an additional $150.0 million, in the aggregate, in each case in minimum increments of $25.0 million, subject to certain conditions and the agreement of participating lenders. For the term loan credit facility, the Company is required to make quarterly principal payments of $1.6 million through March 31, 2018 and $3.1 million from June 30, 2018 through December 31, 2020 with the remaining balance due on March 4, 2021.

On October 13, 2017, the Company amended the Credit Agreement to increase the Revolving Credit Facility from $575.0 million to $700.0 million and increase the Term Loan from $125.0 million to $200.0 million and to extend the expiration date from March 4, 2021 to October 13, 2022. The Credit Agreement also includes the option for the Company to increase the size of the Revolving Credit Facility and the Term Loan by up to an additional $300.0 million, in the aggregate, subject to the satisfaction of certain conditions set forth in the Credit Agreement. Term Loans may be made in up to two advances. The first advance of $125.0 million occurred on October 13, 2017 and the second advance of $75.0 million occurred on January 16, 2018. For the Term Loan, the Company is required to make quarterly principal payments of 1.25% of the original term loan ($2.5 million with the second advance on January 16, 2018) through maturity, with the remaining balance due on October 13, 2022.

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Outstanding borrowings under the Credit Agreement bear interest, at the Company’s option, at either LIBOR, fixed for interest periods of one, two, three or six-month periods, plus 1.00% to 2.00%, or at the bank’s Base Rate, as defined, plus 0.00% to 1.00%, based upon the Company’s Consolidated Leverage Ratio, as defined. The Company is also required to pay commitment fees on unused portions of the credit agreement ranging from 0.15% to 0.25%, based on the Consolidated Leverage Ratio, as defined. The credit agreement includes representations, covenants and events of default that are customary for financing transactions of this nature. The effective interest rate on outstanding borrowings under the credit facility was 3.13% at March 31, 2018. As of March 31, 2018, the Company had $0.1 million outstanding in letters of credit and had available $696.9 million of borrowing capacity under the Revolving Credit Facility. At March 31, 2018, the Company was in compliance with all covenants under the Credit Agreement. Further information regarding the Company’s credit agreement is provided in Note 5, Debt, of the Notes to the Condensed Consolidated Financial Statements included in this Quarterly Report.

Senior Notes

On December 8, 2016, the Company entered into a Note Purchase Agreement, pursuant to which the Company issued and sold €212 million aggregate principal amount of senior notes in two series. The funding date for the Euro denominated senior notes occurred on December 8, 2016 for €117 million in aggregate amount of 1.14% Senior Notes, Series A, due December 8, 2023, and €95 million in aggregate amount of 1.83% Senior Notes, Series B due December 8, 2028 (together, the “Euro Senior Notes”). Interest on the Euro Senior Notes is payable semiannually on June 8 and December 8, commencing June 8, 2017.

On December 8, 2016, the Company entered into a Note Purchase Agreement, pursuant to which the Company issued and sold $125 million aggregate principal amount of senior notes in two series. On February 15, 2017, $25 million in aggregate principal amount of 3.03% Senior Notes, Series A, due February 15, 2022, and $100 million in aggregate principal amount of 3.74% Senior Notes, Series B, due February 15, 2027 (together, the “U.S. Senior Notes,” and together with the Euro Senior Notes, the “Senior Notes”) were funded. Interest on the U.S. Senior Notes will be payable semiannually on February 15 and August 15, commencing August 15, 2017. Further information regarding the Company’s Senior Notes is provided in Note 5, Debt, of the Notes to the Condensed Consolidated Financial Statements included in this Quarterly Report.

On November 15, 2017, the Company entered into a Note Purchase Agreement pursuant to which the Company issued and sold $175 million in aggregate principal amount of senior notes in two series. On January 16, 2018, $50 million aggregate principal amount of 3.48% Senior Notes, Series A, due February 15, 2025 (“U.S. Senior Notes, Series A due 2025”) and $125 million in aggregate principal amount of 3.78% Senior Notes, Series B, due February 15, 2030 (“U.S. Senior Notes, Series B due 2030”) (together the “U.S. Senior Notes due 2025 and 2030” and with the Euro Senior Notes and the U.S. Senior Notes 2022 and 2027, the “Senior Notes”) were funded. Interest on the U.S. Senior Notes due 2025 and 2030 will be payable on February 15 and August 15, commencing on August 15, 2018.

Cash Flow Overview

|  | First Quarter |
(in thousands) |  | 2017 |  |  | 2016 |
Net cash provided by operating activities |  | $ | 69,268 |  |  | $ | 22,943 |
Net cash used in investing activities |  |  | (324,377 | ) |  |  | (22,098 | )
Net cash provided by financing activities |  |  | 240,308 |  |  |  | 2,938 |
Effect of exchange rate changes on cash and cash equivalents |  |  | (2,417 | ) |  |  | (928 | )
Increase (decrease) in cash and cash equivalents |  |  | (17,218 | ) |  |  | 2,855 |
Cash and cash equivalents at beginning of period |  |  | 429,676 |  |  |  | 275,124 |
Cash and cash equivalents at end of period |  | $ | 412,458 |  |  | $ | 277,979 |

The following describes the Company’s cash flows for the three months ended March 31, 2018 and April 1, 2017.

Cash Flow from Operating Activities

Operating cash inflows are largely attributable to sales of the Company’s products. Operating cash outflows are largely attributable to recurring expenditures for raw materials, labor, rent, interest, taxes and other operating activities.

Net cash provided by operating activities was $69.3 million for the first three months of 2018, compared to $22.9 million during the three months ended April 1, 2017. The increase in net cash provided by operating activities was primarily driven by higher earnings and favorable working capital management that more than offset higher payments related to acquisition and integration costs.

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Cash Flow from Investing Activities

Net cash used in investing activities was $324.4 million for the three months ended March 31, 2018, compared to $22.1 million during the three months ended April 1, 2017. Net cash used for the acquisition of IXYS was $306.5 million for the three months ended March 31, 2018 as compared to net cash used for the acquisition of a majority stake in Monolith of $14.2 million for the three months ended April 1, 2017. Capital expenditures were $17.9 million, representing an increase of $5.5 million compared to 2017.

Cash Flow from Financing Activities

Net cash provided by financing activities was $240.3 million for the three months ended 2018 compared to $2.9 million for the three months ended 2017. The Company had $300.0 million of proceeds from the credit facility, term loan and senior notes payable and $49.5 million of payments on the term loan and credit facility in the first quarter of 2018 as compared to $125.0 million of proceeds from the senior notes payable and $114.1 million of payments on the term loan and credit facility in the first quarter of 2017. Additionally, dividends paid increased $1.7 million from $7.5 million in 2017 to $9.2 million for the three months ended March 31, 2018.

Share Repurchase Program

The Company’s Board of Directors authorized the repurchase of up to 1,000,000 shares of the Company’s common stock under a program for the period May 1, 2017 to April 30, 2018 (“Share Repurchase Program”). The Company did not repurchase any shares of its common stock during fiscal 2017 or the first quarter of 2018. The Share Repurchase Program expired on April 30, 2018 with no shares repurchased. In April 2018, the Company’s Board of Directors authorized a new program to repurchase up to 1,000,000 shares of the Company’s common stock for the period May 1, 2018 to April 30, 2019.

Off-Balance Sheet Arrangements

As of March 31, 2018, the Company did not have any off-balance sheet arrangements, as defined under SEC rules. Specifically, the Company was not liable for guarantees of indebtedness owed by third parties, the Company was not directly liable for the debt of any unconsolidated entity and the Company did not have any retained or contingent interest in assets. The Company does not participate in transactions that generate relationships with unconsolidated entities or financial partnerships, such as entities often referred to as structured finance or special purpose entities.

Critical Accounting Policies and Estimates

The Company’s Condensed Consolidated Financial Statements are prepared in accordance with U.S. GAAP. In connection with the preparation of the Condensed Consolidated Financial Statements, the Company uses estimates and makes judgments and assumptions about future events that affect the reported amounts of assets, liabilities, revenue, expenses, and the related disclosures. The assumptions, estimates, and judgments are based on historical experience, current trends, and other factors the Company believes are relevant at the time it prepares the Condensed Consolidated Financial Statements.

The significant accounting policies and critical accounting estimates are consistent with those discussed in Note 1, Summary of Significant Accounting Policies and Other Information, to the consolidated financial statements and the MD&A section of the Company’s Annual Report on Form 10-K for the year ended December 30, 2017. During the three months ended March 31, 2018, there were no significant changes in the application of critical accounting policies.

Recent Accounting Pronouncements

In February 2016, the FASB issued ASU No. 2016-02, "Leases" (Topic 842). This ASU requires lessees to recognize, on the balance sheet, assets and liabilities for the rights and obligations created by leases of greater than twelve months. The accounting by lessors will remain largely unchanged. The ASU is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018, with early adoption permitted. Adoption will require a modified retrospective transition. The Company will adopt the standard in the first quarter of 2019. The Company is currently evaluating the impact of ASU 2016-02.

In January 2018, the FASB released guidance on the accounting for tax on the global intangible low-taxed income ("GILTI") provisions in the Tax Act. The GILTI provisions impose a tax on foreign income in excess of a deemed return on tangible assets of foreign corporations. The guidance indicates that either accounting for deferred taxes related to GILTI inclusions or treating any taxes on GILTI inclusions as period cost are both acceptable methods subject to an accounting policy election. The Company has not yet completed its assessment and therefore has not yet elected an accounting policy.

In February 2018, the FASB issued ASU No. 2018-02 “Income Statement—Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income,” which permits the reclassification of tax effects stranded in accumulated other comprehensive income to retained earnings as a result of the Tax Act. The standard also requires entities to disclose whether or not they elected to reclassify the tax effects related to the Tax Act as well as their policy for releasing income tax effects from accumulated other comprehensive income. The standard allows the option of applying either a retrospective adoption, meaning the standard is applied to all periods in which the effect of the Tax Act is recognized, or applying the amendments in the period of adoption, meaning an adjustment is made to shareholder’s equity as of the beginning of the reporting period. ASU 2018-02 will be effective in the first quarter of 2019; however early adoption is permitted for interim and annual periods, including the reporting period in which the Tax Act was enacted. The Company is currently evaluating the impact of ASU 2018-02 on the Consolidated Financial Statements.

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ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK.

See Item 7A, Quantitative and Qualitative Disclosures about Market Risk, of our Annual Report on Form 10-K for the year ended December 30, 2017. During the three months ended March 31, 2018, there have been no material changes in our exposure to market risk.

ITEM 4. CONTROLS AND PROCEDURES

(a) Evaluation of Disclosure Controls and Procedures

Disclosure controls and procedures (as defined in Rules 13a-15(b) and 15d-15(e) under the Exchange Act) are designed to ensure that information required to be disclosed in reports filed or submitted under the Exchange Act is recorded, processed, summarized, and reported within the time periods specified in the SEC rules and forms, and that such information is accumulated and communicated to management, including our Chief Executive Officer and Chief Financial Officer, to allow timely decisions regarding required disclosures.

In connection with the preparation of this report, management, under the supervision and with the participation of the Chief Executive Officer and Chief Financial Officer, conducted an evaluation of the effectiveness of the design and operation of our disclosure controls and procedures as of March 31, 2018. Based on that evaluation, our Chief Executive Officer and Chief Financial Officer have concluded that, as of the quarter ended March 31, 2018, our disclosure controls and procedures were effective.

(b) Changes in Internal Control over Financial Reporting

The Company acquired IXYS Corporation on January 17, 2018. IXYS Corporation operated with a different internal control environment than that of Littelfuse, Inc. The Company’s evaluation of IXYS’ internal controls over financial reporting and integration of IXYS into the Company’s internal control structure is ongoing. Otherwise, there were no changes in our internal control over financial reporting identified in connection with the evaluation required by Rules 13a-15(f) and 15d-15(f) under the Exchange Act that occurred during the quarter ended March 31, 2018 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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PART II – OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

None.

ITEM 1A. RISK FACTORS

During the three months ended March 31, 2018, there have been no material changes from the risk factors disclosed in our Annual Report on Form 10-K for our year ended December 30, 2017.

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

Recent Sales of Unregistered Securities

None.

Purchases of Equity Securities

None.

ITEM 3. DEFAULTS UPON SENIOR SECURITIES

None.

ITEM 4. MINE SAFETY DISCLOSURES

None.

ITEM 5. OTHER INFORMAITON

None.

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ITEM 6. EXHIBITS

| Exhibit | Description
| 10.1* | Joinder Agreement, dated as of March 14, 2018, by and between Clare Capital, Inc., Clare Components, Inc., Clare Electronics, Inc., Clare Instruments, Inc., Clare Services, Inc., Clare Technologies, Inc., Directed Energy, Inc., IXYS Buckeye, LLC, IXYS Integrated Circuits Division AV Inc., IXYS Integrated Circuits Divisions Inc., IXYS Long Beach, Inc., IXYS USA, Inc., Microwave Technology, Inc., Pele Technology, Inc., Reaction Technology Incorporation, Zilog, Inc., and Bank of America, N.A., as agent.
| 10.2* | U.S. Subsidiary Guarantor Supplement, dated as of March 14, 2018, made by Clare Capital, Inc., Clare Components, Inc., Clare Electronics, Inc., Clare Instruments, Inc., Clare Services, Inc., Clare Technologies, Inc., Directed Energy, Inc., IXYS Buckeye, LLC, IXYS Integrated Circuits Division AV Inc., IXYS Integrated Circuits Divisions Inc., IXYS Long Beach, Inc., IXYS USA, Inc., Microwave Technology, Inc., Pele Technology, Inc., Reaction Technology Incorporation and Zilog, Inc. in favor of the note purchasers and the other holders.
| 10.3* | Cross Border Subsidiary Guarantor Supplement, dated as of March 14, 2018, made by Clare Capital, Inc., Clare Components, Inc., Clare Electronics, Inc., Clare Instruments, Inc., Clare Services, Inc., Clare Technologies, Inc., Directed Energy, Inc., IXYS Buckeye, LLC, IXYS Integrated Circuits Division AV Inc., IXYS Integrated Circuits Divisions Inc., IXYS Long Beach, Inc., IXYS USA, Inc., Microwave Technology, Inc., Pele Technology, Inc., Reaction Technology Incorporation and Zilog, Inc. in favor of the note purchasers and the other holders.
| 10.4* | Note Purchase Agreement Subsidiary Guarantor Supplement, dated as of March 14, 2018, made by Clare Capital, Inc., Clare Components, Inc., Clare Electronics, Inc., Clare Instruments, Inc., Clare Services, Inc., Clare Technologies, Inc., Directed Energy, Inc., IXYS Buckeye, LLC, IXYS Integrated Circuits Division AV Inc., IXYS Integrated Circuits Divisions Inc., IXYS Long Beach, Inc., IXYS USA, Inc., Microwave Technology, Inc., Pele Technology, Inc., Reaction Technology Incorporation and Zilog, Inc. in favor of the note purchasers and the other holders.
| 31.1* | Certification of David W. Heinzmann, Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
| 31.2* | Certification of Meenal A. Sethna, Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
| 32.1** | Certification Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
| 101.INS* | XBRL Instance Document
| 101.SCH* | XBRL Taxonomy Extension Schema Document
| 101.CAL* | XBRL Taxonomy Extension Calculation Linkbase Document
| 101.DEF* | XBRL Taxonomy Definition Linkbase Document
| 101.LAB* | XBRL Taxonomy Extension Label Linkbase Document
| 101.PRE* | XBRL Taxonomy Extension Presentation Linkbase Document
| + | Certain schedules and exhibits omitted pursuant to Item 601(b)(2) of Regulation S-K promulgated by the SEC. The registrant agrees to furnish supplementally a copy of any omitted schedule or exhibit to the SEC upon request.
| * | Filed herewith.
| ** | Furnished herewith.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this Quarterly Report on Form 10-Q for the quarter ended March 31, 2018, to be signed on its behalf by the undersigned thereunto duly authorized.

| Littelfuse, Inc. |
| By: | /s/ Meenal A. Sethna |
|  | Meenal A. Sethna |
| Executive Vice President and Chief Financial Officer
Date: May 2, 2018 |  |  |
| By: | /s/ Jeffrey G. Gorski |
|  | Jeffrey G. Gorski |
| Vice President and Chief Accounting Officer

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