Cyclerion Therapeutics Inc

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington D.C. 20549

FORM 10-K

For the fiscal year ended December 31,2023

OR

Commission file number: 001-38787

CYCLERION THERAPEUTICS, INC.

(Exact name of registrant as specified in its charter)

(857)327-8778

Registrant’s telephone number, including area code

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

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

None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes ☐No ☒

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes ☐No ☒

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 ☒ No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☒ No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, 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:

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 has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report.☐

If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect

the correction of an error to previously issued financial statements.☐

Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of

the registrant’s executive officers during the relevant recovery period pursuant to §240.10D-1(b).☐

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

The aggregate market value of the common stock held by non-affiliates of the registrant, as of June 30, 2023, the last business day of the registrant’s most recently completed second fiscal quarter, was approximately $7.1 million, computed using the closing price on that day of $4.12.

As of February 29, 2024, there were 2,710,096 shares of common stock outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant’s definitive Proxy Statement, to be filed pursuant to Regulation 14A under the Securities Exchange Act of 1934, for its 2024 Annual Meeting of Stockholders are incorporated by reference in Part III of this Form 10-K.

TABLE OF CONTENTS

CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

This Annual Report on Form 10-K, or this Annual Report, contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, or the Exchange Act, that involve substantial risks and uncertainties. The forward-looking statements are contained principally in Part I, Item 1. “Business,” Part I, Item 1A. “Risk Factors,” and Part II, Item 7. “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” but are also contained elsewhere in this Annual Report. In some cases, you can identify forward-looking statements by the words “may,” “might,” “will,” “would,” “could,” “should,” “believes,” “estimates,” “projects,” “potential,” “expects,” “plans,” “seeks,” “intends,” “evaluates,” “pursues,” “anticipates,” “continues,” “designs,” “impacts,” “affects,” “forecasts,” “target,” “outlook,” “initiative,” “objective,” “designed,” “priorities,” “goal” or the negative of those words or other similar expressions may identify forward-looking statements that represent our current judgment about possible future events, but the absence of these words does not necessarily mean that a statement is not forward-looking.

Forward-looking statements are based on our current expectations and assumptions regarding our business, the economy and other future conditions. Because forward-looking statements relate to the future, by their nature, they are subject to inherent uncertainties, risks and changes in circumstances that are difficult to predict. As a result, our actual results may differ materially from those contemplated by the forward-looking statements. Important factors that could cause actual results to differ materially from those in the forward-looking statements include regional, national or global political, economic, business, competitive, market and regulatory conditions and the following:

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our plans with respect to the development, manufacture or sale of our current product candidates and potential future product candidates we may acquire or license and associated timing thereof, including the design and results of pre-clinical and clinical studies;

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there is substantial doubt regarding our ability to continue as a going concern;

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the timing, investment and associated activities involved in developing, obtaining regulatory approval for, launching and commercializing our current and potential future product candidates;

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the risks in our investment in Tisento tied to Tisento developing, obtaining regulatory approval for, launching and commercializing their product candidates;

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the uncertainty as to any liquidity or monetizable value of our equity interest in Tisento, which faces all the risks of an early-stage pharmaceutical development company;

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our relationships with third parties, collaborators and our employees;

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our ability to execute our strategic priorities;

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our ability to finance our operations and business initiatives;

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maintaining our Nasdaq listing;

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our ability to enter into collaboration or license agreements of our current product candidates and potential future product candidates;

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our ability to access capital, capabilities, and transactions necessary to advance the development of our current product candidates and potential future product candidates;

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whether any development, regulatory, and commercialization milestones or royalty payments provided for in the agreement with Akebia will be achieved;

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the impact on our business of workforce and expense reduction initiatives;

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the safety profile and related adverse events of our current and potential future product candidates;

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the efficacy and perceived therapeutic benefits of our current and potential future product candidates, their potential indications and their market potential;

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U.S. and non-U.S. regulatory requirements, including any post-approval development and regulatory requirements, and the ability of our current and potential future product candidates to meet such requirements;

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Our ability to obtain reimbursement from the U.S. government and third-party payors for our current and potential future product candidates if and when commercialized;

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our ability to attract and retain employees needed to execute our business plans and strategies and our ability to manage the impact of any loss of key employees;

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our ability to obtain and maintain intellectual property protection for our current and potential future product candidates and the strength thereof;

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the risk that third parties may allege we infringe their intellectual property rights;

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our future financial performance, revenues, expense levels, payments, cash flows, profitability, tax obligations, capital raising and liquidity sources, real estate needs and concentration of voting control, as well as the timing and drivers thereof, and internal control over financial reporting;

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the coronavirus (“COVID-19”) pandemic may continue to disrupt our business, including our development activities;

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trends and challenges in the markets for our potential products;

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a determination that we constitute an investment company under the Investment Company Act of 1940, as amended, and if we are required to register thereunder, would have a material adverse effect on us;

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our ability to compete with other companies that are or may be developing or selling products that are competitive with any current or potential future product candidates; and

•

the impact of government regulation in the life sciences industry, particularly with respect to healthcare reform.

You should refer to “Item 1A. Risk Factors” in this Annual Report on Form 10-K for a discussion of important factors that may cause our actual results to differ materially from those expressed or implied by our forward-looking statements. As a result of these factors, we cannot assure you that the forward-looking statements in this Annual Report will prove to be accurate. Furthermore, if our forward-looking statements prove to be inaccurate, the inaccuracy may be material. In light of the significant uncertainties in these forward-looking statements, you should not regard these statements as a representation or warranty by us or any other person that we will achieve our objectives and plans in any specified time frame, or at all. The forward-looking statements in this Annual Report represent our views as of the date of this Annual Report. We anticipate that subsequent events and developments may cause our views to change. However, while we may elect to update these forward-looking statements at some point in the future, we undertake no obligation to publicly update any forward-looking statements, whether as a result of new information, future developments or otherwise, except as required by law. You should, therefore, not rely on these forward-looking statements as representing our views as of any date following the date of this Annual Report.

You should read this report and the documents that we reference in this report, completely and with the understanding that our actual future results may be materially different from what we expect. We qualify all of our forward-looking statements by these cautionary statements.

Unless the context requires otherwise, references in this report to “Cyclerion,” the “Company,” “we,” “us,” and “our” refer to Cyclerion Therapeutics, Inc. and, where appropriate, our consolidated subsidiaries.