X0306 4 2022-07-18 1 0001534969 SERA PROGNOSTICS, INC. SERA 0001873840 Blue Ox Healthcare Partners, LLC C/O SERA PROGNOSTICS, INC. 2749 EAST PARLEYS WAY, SUITE 200 SALT LAKE CITY UT 84109 0 0 1 0 0001785138 Blue Ox Healthcare Partners SP, LLC C/O SERA PROGNOSTICS, INC. 2749 EAST PARLEYS WAY, SUITE 200 SALT LAKE CITY UT 84109 0 0 1 0 0001804589 BXHCP SP II, LLC C/O SERA PROGNOSTICS, INC. 2749 EAST PARLEYS WAY, SUITE 200 SALT LAKE CITY UT 84109 0 0 1 0 0001862000 BXHCP SP III, LLC C/O SERA PROGNOSTICS, INC. 2749 EAST PARLEYS WAY, SUITE 200 SALT LAKE CITY UT 84109 0 0 1 0 Class A Common Stock 2022-07-18 4 J 0 1383094 0 D 132501 I By Blue Ox Healthcare Partners SP, LLC Class A Common Stock 2022-07-18 4 J 0 997627 0 D 77420 I By BXHCP SP II, LLC Class A Common Stock 2022-07-18 4 J 0 1157764 0 D 46744 I By BXHCP SP III, LLC Shares have been distributed pro rata for no consideration to certain members of each of Blue Ox Healthcare Partners SP, LLC, BXHCP SP II, LLC, and BXHCP SP III, LLC in accordance with the required distribution of marketable securities stipulation in the respective Limited Liability Company Agreements. Blue Ox Healthcare Partners, LLC is the manager of each of Blue Ox Healthcare Partners SP, LLC, BXHCP SP II, LLC, and BXHCP SP III, LLC, and may be deemed to have voting, investment and dispositive power with respect to the shares held by Blue Ox Healthcare Partners SP, LLC, BXHCP SP II, LLC, and BXHCP SP III, LLC. Charles D. Kennedy MD, Oded Levy, and John A. Neczesny, managing partners of Blue Ox Healthcare Partners, LLC, each may be deemed to share voting, investment and dispositive power with respect to these shares. Blue Ox Healthcare Partners, LLC /s/ John A. Neczesny, Secretary 2022-07-19 Blue Ox Healthcare Partners SP, LLC /s/ John A. Neczesny, Secretary 2022-07-19 BXHCP SP II, LLC /s/ John A. Neczesny, Secretary 2022-07-19 BXHCP SP III, LLC /s/ John A. Neczesny, Secretary 2022-07-19