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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): November 7, 2024

SERES THERAPEUTICS, INC.

(Exact name of Registrant as Specified in Its Charter)

Delaware |  | 001-37465 |  | 27-4326290
(State or other jurisdiction of incorporation) |  | (Commission File Number) |  | (IRS Employer Identification No.)

101 Cambridgepark Drive Cambridge, MA |  | 02140
(Address of principal executive offices) |  | (Zip Code)

Registrant’s telephone number, including area code: (617) 945-9626

Not Applicable

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ | Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ | Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ | Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ | Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

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

Title of each class |  | Trading Symbol(s) |  | Name of each exchange on which registered
Common stock, par value $0.001 per share |  | MCRB |  | The Nasdaq Stock Market LLC
|  |  |  | (Nasdaq Global Select Market)

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

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. ☐

Item 2.02. Results of Operations and Financial Condition.

On November 13, 2024, Seres Therapeutics, Inc. (the “Company”) announced its financial results for the quarter ended September 30, 2024 and provided operational updates. The full text of the press release issued in connection with the announcement is furnished as Exhibit 99.1 to this Current Report on Form 8-K (the “Current Report”).

Item 3.01. Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing.

On November 7, 2024, the Company received a letter from the Listing Qualifications Department of The Nasdaq Stock Market LLC (“Nasdaq”) notifying the Company that, for the last 30 consecutive business days, the bid price for the Company’s common stock, par value $0.001 per share (the “Common Stock”), had closed below the $1.00 per share minimum bid price requirement for continued inclusion on The Nasdaq Global Select Market pursuant to Nasdaq Listing Rule 5450(a)(1) (the “Bid Price Requirement”).

The letter has no immediate effect on the listing of the Common Stock on The Nasdaq Global Select Market, and the Common Stock will continue to trade on The Nasdaq Global Select Market under the symbol “MCRB,” subject to the Company’s compliance with the other continued listing requirements of The Nasdaq Global Select Market. In accordance with Nasdaq Listing Rule 5810(c)(3)(A), the Company has been provided an initial compliance period of 180 calendar days from receipt of the letter, or until May 6, 2025, to regain compliance with the Bid Price Requirement. To regain compliance, the closing bid price for the Common Stock must be at least $1.00 per share for a minimum of 10 consecutive business days prior to May 6, 2025. There can be no assurance that the Company will be able to regain compliance or that Nasdaq will extend the compliance period.

If the Company does not regain compliance with the Bid Price Requirement by May 6, 2025, the Company may be eligible for an additional 180 calendar day compliance period. To qualify, the Company must submit an application to transfer the listing of the Common Stock to The Nasdaq Capital Market, which requires the Company to meet the continued listing requirement for the market value of publicly held shares and all other initial listing standards for The Nasdaq Capital Market, other than the Bid Price Requirement. The Company would also need to pay an application fee to Nasdaq and to provide written notice of its intention to cure the deficiency during the additional compliance period. As part of its review process, Nasdaq will make a determination of whether it believes the Company will be able to cure this deficiency.

If the Company does not regain compliance within the applicable compliance period(s), the Company expects that Nasdaq will provide written notification to the Company that the Common Stock will be subject to delisting. At that time, the Company may appeal the delisting determination to a Nasdaq Listing Qualifications Panel.

The Company intends to monitor the closing bid price of the Common Stock and may, if appropriate, consider taking actions to regain compliance with the Bid Price Requirement, including, subject to approval of the Company’s Board of Directors and its stockholders, implementing a reverse stock split.

There can be no assurance that the Company will be able to regain compliance with the Bid Price Requirement or will otherwise be in compliance with other applicable Nasdaq listing rules within the applicable compliance period(s), that the Company will be able to successfully implement a reverse stock split, or, if the Company receives a delisting determination and decides to appeal the delisting determination, that such appeal would be successful.

Item 7.01. Regulation FD Disclosure.

On November 13, 2024, the Company posted an updated corporate presentation in the “Investors and News” portion of its website at www.serestherapeutics.com. A copy of the slide presentation is attached as Exhibit 99.2 to this Current Report and incorporated herein by reference.

The information in Items 2.02 and 7.01 of this Current Report, including Exhibits 99.1 and 99.2 attached hereto, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act, except as expressly set forth by specific reference in such filing.

Forward-Looking Statements Disclaimer

This Current Report contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. All statements contained in this Current Report on Form 8-K that do not relate to matters of historical fact should be considered forward-looking statements, including statements regarding the Company’s intent or ability to transfer the listing of its common stock to The Nasdaq Capital Market, regain compliance with any applicable Nasdaq listing requirements, implement a reverse stock split, or the timing of any of the foregoing. These forward-looking statements are based on the Company’s management’s current expectations. These statements are neither promises nor guarantees, but involve known and unknown risks, uncertainties and other important factors that may cause the Company’s actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by the forward-looking statements, including, but not limited to the factors discussed under the caption “Risk Factors” in our Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission (SEC), on August 13, 2024, and our other reports filed with the SEC could cause actual results to differ materially from those indicated by the forward-looking statements made in this Current Report. Any such forward-looking statements represent management’s estimates as of the date of this Current Report. While we may elect to update such forward-looking statements at some point in the future, we disclaim any obligation to do so, even if subsequent events cause our views to change. These forward-looking statements should not be relied upon as representing our views as of any date subsequent to the date of this Current Report.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits

The following Exhibits 99.1 and 99.2 relate to Items 2.02 and 7.01, respectively, and shall be deemed to be furnished, and not filed:

Exhibit No. |  | Description
99.1 |  | Seres Therapeutics, Inc. Press Release issued November 13, 2024
99.2 |  | Seres Therapeutics, Inc. Corporate Presentation as of November 2024
104 |  | Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURES

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

|  |  |  | SERES THERAPEUTICS, INC.
Date: November 13, 2024 |  |  |  | By: |  | /s/ Thomas J. DesRosier
|  |  |  | Name: |  | Thomas J. DesRosier
|  |  |  | Title: |  | Chief Legal Officer and Executive Vice President