X0306 4 2019-09-19 0 0001274737 EXAGEN INC. XGN 0001144359 TULLIS DICKERSON CAPITAL FOCUS III, L.P. 11770 US HIGHWAY ONE, SUITE 503 PALM BEACH GARDENS FL 33408 0 0 1 0 0001606950 Tullis Growth Fund, L.P. 11770 US HIGHWAY ONE, SUITE 503 PALM BEACH GARDENS FL 33408 0 0 1 0 0001746842 TULLIS GROWTH FUND II, L.P. 11770 US HIGHWAY ONE, SUITE 503 PALM BEACH GARDENS FL 33408 0 0 1 0 0001144364 TULLIS DICKERSON PARTNERS III, L.L.C. 11770 US HIGHWAY ONE, SUITE 503 PALM BEACH GARDENS FL 33408 0 0 1 0 Common Stock 2019-09-19 4 X 0 11498 14.3235 A 11597 I See footnote Common Stock 2019-09-19 4 F 0 8865 18.58 D 2732 I See footnote Common Stock 2019-09-23 4 C 0 1786853 0.00 A 1789585 I See footnote Warrants 14.3235 2019-09-19 4 X 0 11498 14.3235 D Common Stock 11498 0 I See footnotes Series A-3 Redeemable Convertible Preferred Stock 2019-09-23 4 C 0 468321 D Common Stock 2550 0 I See footnotes Series C Redeemable Convertible Preferred Stock 2019-09-23 4 C 0 5446902 D Common Stock 95069 0 I See footnotes Series E Redeemable Convertible Preferred Stock 2019-09-23 4 C 0 53251030 D Common Stock 929432 0 I See footnotes Series F Redeemable Convertible Preferred Stock 2019-09-23 4 C 0 81166266 D Common Stock 441998 0 I See footnotes Series H Redeemable Convertible Preferred Stock 2019-09-23 4 C 0 58359932 D Common Stock 317804 0 I See footnotes The shares reported on this form are held of record by Tullis-Dickerson Capital Focus III, L.P. ("Tullis"), Tullis Growth Fund, L.P. ("Tullis Growth") and Tullis Growth Fund II, L.P. ("Tullis Growth II"). Tullis-Dickerson Partners III, LLC ("Tullis Partners") is the general partner of Tullis and may be deemed to beneficially own the securities held by Tullis. Tullis Growth Partners, LLC and Tullis Growth Partners II, LLC are the general partners of Tullis Growth and Tullis Growth II, respectively, and may be deemed to beneficially own the securities held by Tullis Growth and Tullis Growth II. James L.L. Tullis is a Principal of each of the foregoing entities and may be deemed to possess voting and investment control over, and may be deemed to have an indirect beneficial ownership with respect to, the shares held by Tullis, Tullis Growth and Tullis Growth II. Represents securities held of record by Tullis. The warrants are currently exercisable and will terminate upon closing of the Issuer's initial public offering. Represents warrants that previously entitled the holders to purchase Series E Redeemable Convertible Preferred Stock, which, pursuant to their terms, were settled in shares of the Issuer's Common Stock. Includes warrants held by Tullis and Tullis Growth, respectively, to purchase 43 shares of the Issuer's Common Stock and warrants to purchase 11,455 shares of the Issuer's Common Stock. The Series A-3 Redeemable Convertible Preferred Stock (the "Series A-3") is convertible into the Issuer's Common Stock on a 183.635-for-one basis at the holder's election and has no expiration date. The Series A-3 automatically converted into Common Stock upon the closing of the Issuer's initial public offering. The Series C Redeemable Convertible Preferred Stock (the "Series C") is convertible into the Issuer's Common Stock on a 57.294-for-one basis at the holder's election and has no expiration date. The Series C automatically converted into Common Stock upon the closing of the Issuer's initial public offering. The Series E Redeemable Convertible Preferred Stock (the "Series E") is convertible into the Issuer's Common Stock on a 57.294-for-one basis at the holder's election and has no expiration date. The Series E automatically converted into Common Stock upon the closing of the Issuer's initial public offering. Includes 656,282 and 273,150 shares of common stock underlying the Series E shares held by Tullis and Tullis Growth, respectively. The Series F Redeemable Convertible Preferred Stock ("Series F") is convertible into the Issuer's Common Stock on a 183.635-for-one basis at the holder's election and has no expiration date. The Series F automatically converted into Common Stock upon the closing of the Issuer's initial public offering. Includes 242,226 and 199,771 shares of common stock underlying the Series F shares held by Tullis and Tullis Growth, respectively. The Series H Redeemable Convertible Preferred Stock ("Series H") is convertible into the Issuer's Common Stock on a 183.635-for-one basis at the holder's election and has no expiration date. The Series H automatically converted into Common Stock upon the closing of the Issuer's initial public offering. Includes 106,897 shares, 105,453 shares and 105,453 shares of common stock underlying the Series H shares held by Tullis, Tullis Growth and Tullis Growth II, respectively. Tullis Growth Fund II, L.P., By: Tullis-Growth Partners II, L.L.C., its general partner, /s/ James L. L. Tullis, Name: James L.L. Tullis, Title: Manager 2019-09-23 Tullis Growth Fund, L.P., By: Tullis-Growth Partners, L.L.C., its general partner, /s/ James L. L. Tullis, Name: James L.L. Tullis, Title: Manager 2019-09-23 Tullis-Dickerson Capital Focus III, L.P., By: Tullis-Dickerson Partners, L.L.C., its general partner, /s/ James L. L. Tullis, Name: James L.L. Tullis, Title: Manager 2019-09-23 Tullis-Dickerson Partners III, L.L.C., /s/ James L. L. Tullis, Name: James L.L. Tullis, Title: Manager 2019-09-23