Amendments to Bylaws (Form 8-K)

Item 5.03. Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year.

On April 2, 2025, the board of directors of FibroGen, Inc. (the "Company") amended and restated the Company's amended and restated bylaws (as amended and restated, the "Amended and Restated Bylaws"), effective immediately. The Amended and Restated Bylaws modified the provisions for determining the presence of a quorum at all meetings of stockholders, to provide that the presence, in person, by remote communication, if applicable, or by proxy, of the holders of at least one-third of the outstanding shares of stock entitled to vote shall constitute a quorum for the transaction of business, and to provide that where a separate vote by a class or classes or series is required, except where otherwise provided by statute, by applicable exchange rules, or by the Company's Certificate of Incorporation or the Amended and Restated Bylaws, the holders of at least one-third of the voting power, rather than a majority of such class or classes or series, present in person, by remote communication, if applicable, or represented by proxy duly authorized, shall constitute a quorum entitled to take action with respect to that vote on that matter. Prior to the amendment and restatement, the presence, in person, by remote communication, if applicable, or by proxy duly authorized, of the holders of a majority of the outstanding shares of stock entitled to vote, constituted a quorum for the transaction of business.

The foregoing brief description of the Amended and Restated Bylaws is qualified in its entirety by the full text of the Amended and Restated Bylaws, filed as Exhibit 3.1 hereto and incorporated herein by reference.