X0202 SCHEDULE 13G/A 0002042077-26-000013 0002042077 XXXXXXXX LIVE 1 Common Stock, $0.001 Par Value Per Share 03/31/2026 0001274737 EXAGEN INC. 30068X103 1261 LIBERTY WAY VISTA CA 92081 Rule 13d-1(c) Chernett Jorey DE 2413901.00 0.00 2413901.00 0.00 2413901.00 N 9.9 IN EXAGEN INC. 1261 LIBERTY WAY, VISTA, CA, 92081 Jorey Chernett (the "Reporting Person") The principal business address of the Reporting Person is 6222 Indianwood Trail, Bloomfield Hills, MI 48301. US Y As of the close of business on May 19, 2026, the Reporting Person beneficially owned 2,413,901 shares of Common stock, par value $0.001 per share, of the Issuer (the "Shares"). The aggregate percentage of Shares owned by the Reporting Person is based upon 24,159,839 Shares outstanding as of May 6, 2026, as disclosed in the Issuer's Quarterly Report on Form 10-Q, filed with the U.S. Securities and Exchange Commission (the "SEC") on May 11, 2026. As of the close of business on May 19, 2026, the Reporting Person may be deemed to beneficially own 9.9% of the outstanding Shares. (c) Number of shares as to which the person has: See Cover Pages Items 5-9. See Cover Pages Items 5-9. See Cover Pages Items 5-9. See Cover Pages Items 5-9. Y Y Y Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11. Chernett Jorey /s/ Jorey Chernett 05/20/2026