Baker Bros. Advisors Lp - Feb 12, 2025 SCHEDULE 13D Report for Sera Prognostics, Inc. Class A Common Stock, $0.0001 par value per share (SERA)

Filing Manager: BAKER BROS. ADVISORS LP
Reporting Manager: Baker Bros. Advisors LP
Security: Sera Prognostics, Inc. Class A Common Stock, $0.0001 par value per share
Symbol: SERA
Shares outstanding: 34.2M shares
Disclosed Ownership: 5.5M shares
Ownership: 16.1%
Form type: SCHEDULE 13D
Date filed: 2/14/2025, 04:33 PM
Date of event: Feb 12, 2025
SEC: View on sec.gov

Reporting Managers (4)

Name	Ownership	Shares Owned	sole voting power	Signature	Title	CIK
Baker Bros. Advisors LP	16.1%	5.5M	5.5M	/s/ Scott L. Lessing	By: Baker Bros. Advisors (GP) LLC, its general partner Scott L. Lessing/ President	0001263508
Baker Bros. Advisors (GP) LLC	16.1%	5.5M	5.5M	/s/ Scott L. Lessing	Scott L. Lessing/ President	0001580575
Julian C. Baker	16.1%	5.5M	5.5M	/s/ Julian C. Baker	Julian C. Baker	0001087939
Felix J. Baker	16.1%	5.5M	5.5M	/s/ Felix J. Baker	Felix J. Baker	0001087940