Terrance McGuire - 09 Dec 2025 Form 4 Insider Report for Seer, Inc. (SEER)

Role: Director
Signature: /s/ David Horn, by power of attorney
Issuer symbol: SEER
Transactions as of: 09 Dec 2025
Net transactions value: $0
Form type: 4
Filing time: 11 Dec 2025, 20:40:15 UTC
Previous filing: 09 Jul 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
MCGUIRE TERRANCE	Director	C/O SEER, INC., 3800 BRIDGE PARKWAY, REDWOOD CITY	/s/ David Horn, by power of attorney	11 Dec 2025	0001117003

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	SEER	Class A Common Stock	Conversion of derivative security		+4,088	+1.9%		215,070	09 Dec 2025	See footnote	F1, F2
holding	SEER	Class A Common Stock						112,066	09 Dec 2025	Direct
holding	SEER	Class A Common Stock						78,947	09 Dec 2025	See footnote	F3

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	SEER	Class B Common Stock	Conversion of derivative security	$0	-4,088	-100%	$0.000000	0	09 Dec 2025	Class A Common Stock	4,088		See footnote	F1, F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Pursuant to the Issuer's amended and restated certificate of incorporation, as amended, each share of the Issuer's Class B Common Stock automatically converted into one share of Class A Common Stock at the close of business on the first day following the fifth anniversary of the closing of the Issuer's initial public offering.
F2	The reported shares are held of record by Strong Bridge, LLC for which the Reporting Person serves as an operating manager.
F3	The reported shares are held of record by Polaris Founders Capital Fund I, L.P. ("PFCF I"). Polaris Founders Capital Management Co. I, L.L.C. ("PFCM"), is the general partner of PFCF I. The Reporting Person and Jonathan A. Flint ("Flint") are the managing members of PFCM. Each of the Reporting Person and Flint in their respective capacities with respect to PFCM may be deemed to have shared voting and dispositive power with respect to the shares held by PFCF I. Each of PFCM, Flint, and the Reporting Person disclaims beneficial ownership of securities held by PFCF I, and this report shall not be deemed an admission that the Reporting Person, Flint, or PFCM is the beneficial owner of these securities for purposes of Section 16 or for any other purpose, except to the extent of their respective pecuniary interests therein.