Coherus BioSciences Inc

AMENDMENT NO. 1

TO

COHERUS BIOSCIENCES, INC.

2014 EMPLOYEE STOCK PURCHASE PLAN

This Amendment No. 1 (this “Amendment”) to the 2014 Employee Stock Purchase Plan (the “Plan”) of Coherus BioSciences, Inc., a Delaware corporation (the “Company”) is made pursuant to Section 7.5 of the Plan, effective as of April 23, 2025.

WITNESSETH THAT:

WHEREAS,** **the Company presently maintains the Plan for the benefit of its employees and employees of its Designated Subsidiaries (as defined in the Plan); and

WHEREAS, pursuant to Section 7.5 of the Plan, the Board of Directors of the Company (the “Board”) may, in its sole discretion, amend, suspend, or terminate the Plan at any time; and

WHEREAS, an amendment to increase the number of shares of Common Stock subject to the Plan is not effective without the approval of the Company’s stockholders within twelve (12) months before or after an action by the Board to amend the Plan to increase the number of shares of Common Stock reserved for the Plan; and

WHEREAS, the Board believes it is in the best interests of the Company to amend the Plan as set forth in this Amendment.

NOW THEREFORE, the Plan is hereby amended as follows:

“Common Stock Reserved. Subject to adjustment as provided in Section 5.2 hereof, the maximum number of shares of Common Stock that shall be made available for sale under the Plan shall be 5,020,000 shares of Common Stock may be issued under the Plan. Shares of Common Stock made available for sale under the Plan may be authorized but unissued shares, treasury shares of Common Stock, or reacquired shares reserved for issuance under the Plan.”

Signature [PLEASE SIGN WITHIN BOX] Date Signature (Joint Owners) Date TO VOTE, MARK BLOCKS BELOW IN BLUE OR BLACK INK AS FOLLOWS: KEEP THIS PORTION FOR YOUR RECORDS DETACH AND RETURN THIS PORTION ONLY THIS PROXY CARD IS VALID ONLY WHEN SIGNED AND DATED. V74644-P33439 ! ! ! 01) Jill O'Donnell-Tormey, Ph.D. 02) Michael Ryan 03) Ali J. Satvat For All Withhold All For All Except For Against Abstain For Against Abstain For Against Abstain ! ! ! ! ! ! ! ! ! To withhold authority to vote for any individual nominee(s), mark "For All Except" and write the number(s) of the nominee(s) on the line below. COHERUS BIOSCIENCES, INC. COHERUS BIOSCIENCES, INC. 333 TWIN DOLPHIN DRIVE SUITE 600 REDWOOD CITY, CA 94065 Nominees: Please sign exactly as your name(s) appear(s) hereon. When signing as attorney, executor, administrator, or other fiduciary, please give full title as such. Joint owners should each sign personally. All holders must sign. If a corporation or partnership, please sign in full corporate or partnership name by authorized officer. 1. To elect three Class II directors to hold office until the 2028 Annual Meeting of Stockholders or until their successors are elected. The Board of Directors recommends you vote FOR the following: 2. To ratify the selection, by the Audit Committee of our Board of Directors, of Ernst & Young LLP as our independent registered public accounting firm for the fiscal year ending December 31, 2025. 3. To vote on a non-binding, advisory basis to approve the compensation of the Company's named executive officers (a "Say-on-Pay" vote). 4. To approve the amendment to the Company's 2014 Employee Stock Purchase Plan (the "ESPP Amendment"). NOTE: The proxies may vote in their discretion upon such other business as may properly come before the meeting or any adjournment, continuation or postponement thereof. The Board of Directors recommends you vote FOR the following proposal: The Board of Directors recommends you vote FOR the following proposal: The Board of Directors recommends you vote FOR the following proposal: VOTE BY INTERNET Before The Meeting - Go to www.proxyvote.com or scan the QR Barcode above Use the Internet to transmit your voting instructions and for electronic delivery of information. Vote by 11:59 p.m. Eastern Time on June 10, 2025. Have your proxy card in hand when you access the web site and follow the instructions to obtain your records and to create an electronic voting instruction form. During The Meeting - Go to www.virtualshareholdermeeting.com/CHRS2025 You may attend the meeting via the Internet and vote during the meeting. Have the information that is printed in the box marked by the arrow available and follow the instructions. VOTE BY PHONE - 1-800-690-6903 Use any touch-tone telephone to transmit your voting instructions. Vote by 11:59 p.m. Eastern Time on June 10, 2025. Have your proxy card in hand when you call and then follow the instructions. VOTE BY MAIL Mark, sign and date your proxy card and return it in the postage-paid envelope we have provided or return it to Vote Processing, c/o Broadridge, 51 Mercedes Way, Edgewood, NY 11717. SCAN TO VIEW MATERIALS & VOTEw

V74645-P33439 Important Notice Regarding the Availability of Proxy Materials for the Annual Meeting: The Notice, Proxy Statement and Annual Report are available at www.proxyvote.com COHERUS BIOSCIENCES, INC. Annual Meeting of Stockholders June 11, 2025 1:30 p.m. PDT This proxy is solicited by the Board of Directors The stockholder(s) hereby appoint(s) Dennis M. Lanfear and Bryan McMichael, or either of them, as proxies, each with the power to appoint his substitute, and hereby authorize(s) them to represent and to vote, as designated on the reverse side of this ballot, all of the shares of common stock of Coherus BioSciences, Inc. that the stockholder(s) is/are entitled to vote at the Annual Meeting of Stockholders to be held at 1:30 p.m. PDT on June 11, 2025, via the Internet at www.virtualshareholdermeeting.com/CHRS2025, and any adjournment, continuation or postponement thereof. This proxy, when properly executed, will be voted in the manner directed herein. If no such direction is made, this proxy will be voted in accordance with the Board of Directors' recommendations. Continued and to be signed on reverse side