Initial Registration Statement for Employee Benefit Plan (Form S-8)

As filed with the Securities and Exchange Commission on June 9, 2026

Registration No. 333-

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM S-8

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933

Gyre Therapeutics, Inc.

(Exact name of registrant as specified in its charter)

Gyre Therapeutics, Inc.

12730 High Bluff Drive, Suite 250

San Diego, California 92130

(Address, including zip code, of registrant's principal executive offices)

Cullgen Inc. 2018 Equity Incentive Plan

(Full title of the plan)

Ying Luo, Ph.D.

President and Chief Executive Officer

Gyre Therapeutics, Inc.

12730 High Bluff Drive, Suite 250

San Diego, California 92130

(858) 284-0115

(Name, address and telephone number (including area code) of agent for service)

Copy to:

Sean Feller

Gibson, Dunn & Crutcher LLP

2000 Avenue of the Stars, Suite 1200N

Los Angeles, CA 90067-4700

(310) 552-8500

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.

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 7(a)(2)(B) of the Securities Act. ☐

EXPLANATORY NOTE

On May 4, 2026, pursuant to that certain Agreement and Plan of Merger and Reorganization dated as of March 2, 2026 between Gyre Therapeutics, Inc., a Delaware corporation (the "Registrant"), Cullgen Inc., a Delaware corporation ("Cullgen"), and Helix Merger Sub Corp., a Delaware corporation and wholly-owned subsidiary of the Registrant ("Merger Sub"), Merger Sub merged with and into Cullgen, with Cullgen continuing as the surviving corporation and a wholly owned subsidiary of the Registrant (the "Merger"). In connection with the Merger, the Cullgen Inc. 2018 Equity Incentive Plan (the "Cullgen Plan"), as well as certain equity awards that were granted and outstanding under the Cullgen Plan, were assumed by the Registrant (such awards, the "Assumed Awards") and converted into equity awards in respect of shares of the Registrant's common stock, par value $0.001 per share ("Common Stock").

This Registration Statement on Form S-8 (this "Registration Statement") is being filed by the Registrant for the purpose of registering an additional 4,156,800 shares of Common Stock issuable pursuant to Assumed Awards under the Cullgen Plan.

PART I

INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS

The documents containing the information specified in Part I of Form S-8 will be delivered to employees as specified by Rule 428(b)(1) of the Securities Act. In accordance with the instructions of Part I of Form S-8, such documents are not being filed with the Securities and Exchange Commission (the "Commission") either as part of this Registration Statement or as prospectuses or prospectus supplements pursuant to Rule 424 of the Securities Act. Such documents and the documents incorporated by reference in this Registration Statement pursuant to Item 3 of Part II of Form S-8, taken together, constitute a prospectus that meets the requirements of Section 10(a) of the Securities Act.

PART II

INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

The following documents filed by the Registrant with the Commission are incorporated by reference herein and shall be deemed to be a part hereof:

In addition, all documents filed by the Registrant pursuant to Sections 13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), after the date hereof, but prior to the filing of a post-effective amendment to this Registration Statement that indicates that all securities offered hereby have been sold or that deregisters all such securities then remaining unsold, shall be deemed to be incorporated by reference in this Registration Statement and to be a part hereof from the date of filing of such documents. Notwithstanding the foregoing, unless specifically stated to the contrary in such filing, none of the information that the Registrant discloses under Items 2.02 or 7.01 of any Current Report on Form 8-K that it may from time to time furnish to the Commission will be incorporated by reference into, or otherwise be included in or deemed to be a part of, this Registration Statement.

For purposes of this Registration Statement, any document or any statement contained in a document incorporated or deemed to be incorporated herein by reference shall be deemed to be modified or superseded to the extent that a subsequently filed document or a statement contained herein or in any other subsequently filed document that also is or is deemed to be incorporated herein by reference modifies or supersedes such document or such statement in such document. Any statement so modified or superseded shall not be deemed, except as so modified or superseded, to constitute a part of this Registration Statement. Subject to the foregoing, all information in this Registration Statement is so qualified in its entirety by the information appearing in the documents incorporated herein by reference.

Not applicable.

Not applicable.

Section 145 of the Delaware General Corporation Law authorizes a court to award, or a corporation's board of directors to grant, indemnity to directors and officers under certain circumstances and subject to certain limitations. The terms of Section 145 of the Delaware General Corporation Law are sufficiently broad to permit indemnification under certain circumstances for liabilities, including reimbursement of expenses incurred, arising under the Securities Act.

As permitted by the Delaware General Corporation Law, the Registrant's restated certificate of incorporation and amended and restated bylaws contain provisions relating to the limitation of liability and indemnification of directors and officers. The restated certificate of incorporation provides that the Registrant's directors will not be personally liable to the Registrant or the Registrant's stockholders for monetary damages for any breach of fiduciary duty as a director, except for liability:

The Registrant's restated certificate of incorporation also provides that if the Delaware General Corporation Law is amended to authorize corporate action further eliminating or limiting the personal liability of directors, then the liability of the Registrant's directors will be eliminated or limited to the fullest extent permitted by the Delaware General Corporation Law as so amended.

The Registrant's amended and restated bylaws provide that the Registrant will indemnify its directors and officers to the fullest extent permitted by Delaware law, as it now exists or may in the future be amended (but, in the case of any amendment, only to the extent such amendment permits broader indemnification rights than such law permitted the Registrant prior to such amendment), against all expenses reasonably incurred in connection with their service for or on the Registrant's behalf. The Registrant's amended and restated bylaws provide that it shall advance the expenses incurred by a director or officer in advance of the final disposition of an action or proceeding; provided, however, that if the Delaware General Corporation Law so requires, an advancement of expenses incurred by an indemnitee in his or her capacity as a director or officer (and not in any other capacity in which service was or is rendered by such indemnitee, including without limitation, service to an employee benefit plan) will be made only upon delivery to the Registrant of an undertaking, by or on behalf of such indemnitee, to repay all amounts so advanced if it is ultimately determined that such indemnitee is not entitled to be indemnified by the Registrant under its amended and restated bylaws or otherwise. The Registrant's amended and restated bylaws permit it to secure insurance on behalf of any director, officer, employee, or agent or individual serving at the request of the Registrant as a director, officer, employee or agent of another corporation, partnership, joint venture, trust, employee benefit plan or other enterprise against any liability asserted against such person and incurred by such person in any such capacity, or arising out of such person's status as such, whether or not the Registrant would have the power or the obligation to indemnify such person against such liability under the provisions of the Registrant's amended and restated bylaws.

The Registrant has entered into indemnification agreements with each of its directors and with each of its executive officers. Pursuant to the indemnification agreements, the Registrant has agreed to indemnify and hold harmless these directors and officers to the fullest extent permitted by the Delaware General Corporation Law. The agreements generally cover expenses that a director or officer incurs or amounts that a director or officer becomes obligated to pay because of any proceeding to which he or she is made or threatened to be made a party or participant by reason of his or her service as a current or former director, officer, employee or agent of the Registrant. The agreements also provide for the advancement of expenses to the directors and officers subject to specified conditions. There are certain exceptions to the Registrant's obligation to indemnify the directors and officers, including any intentional malfeasance or act where the director or officer did not in good faith believe he or she was acting in the Registrant's best interests, with respect to "short-swing" profit claims under Section 16(b) of the Exchange Act and, with certain exceptions, with respect to proceedings that he or she initiates.

The Registrant maintains insurance policies that indemnify its directors and officers against various liabilities arising under the Securities Act and the Exchange Act that might be incurred by any director or officer in his or her capacity as such.

Not applicable.

*Filed herewith.

(i)

To include any prospectus required by Section 10(a)(3) of the Securities Act;

provided, however, that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply if the information required to be included in a post-effective amendment by those paragraphs is contained in periodic reports filed with or furnished to the Commission by the Registrant pursuant to Section 13 or Section 15(d) of the Exchange Act that are incorporated by reference in this Registration Statement.

SIGNATURES

Pursuant to the requirements of the Securities Act, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of San Diego, State of California, on June 9, 2026.

POWER OF ATTORNEY

Pursuant to the requirements of the Securities Act, this Registration Statement has been signed by the following persons in the capacities indicated on June 9, 2026.