X0202 SCHEDULE 13G/A 0001628280-22-002560 0001586852 XXXXXXXX LIVE 5 Class A Common Stock 03/31/2026 0001726445 Seer, Inc. 81578P106 c/o Seer, Inc. 3800 Bridge Parkway, Suite 102 Redwood City CA 94065 Rule 13d-1(d) Omid Farokhzad X1 4801594.00 2117138.00 4801594.00 2117138.00 6918732.00 N 12.0 IN Seer, Inc. c/o Seer, Inc., 3800 Bridge Parkway, Suite 102, Redwood City, CA 94065 Omid Farokhzad c/o Seer, Inc. 3800 Bridge Parkway, Suite 102 Redwood City, CA 94065 United States 6,918,732 The amount set forth above includes (i) 2,286,586 shares of Class A common stock held of record by Omid Farokhzad (the "Reporting Person"); (ii) 2,515,008 shares of Class A common stock subject to options exercisable within 60 days of March 31, 2026; and (iii) 2,117,138 shares of Class A common stock held of record by SAF-BND Trust for which the Reporting Person's spouse serves as trustee. The Reporting Person disclaims beneficial ownership of the shares held by the SAF-BND Trust. 12.0 The percentage set forth above is based on the quotient obtained by dividing the aggregate amount beneficially owned by the Reporting Person as set forth in (a) above by the sum of (i) 54,981,551 shares of Class A common stock outstanding as of May 8, 2026, as reported in the Issuer's Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2026, filed with the Securities and Exchange Commission on May 13, 2026 (the "Form 10-Q") and (ii) 2,515,008 shares of Class A common stock subject to options exercisable within 60 days of March 31, 2026. 4,801,594 2,117,138 4,801,594 2,117,138 Y Y Y Y Y Y Omid Farokhzad /s/ Omid Farokhzad 05/15/2026