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

Reporting relationship: Director
Issuer ticker: SEER
Reported as of: 09 Dec 2025
Net transaction value: $0
SEC form: 4
Accepted by SEC: 11 Dec 2025, 20:40:15 UTC
Prior SEC filing: 09 Jul 2025
Next SEC filing: 21 May 2026
Source filing: View source filing
Reporting owner signature: /s/ David Horn, by power of attorney

Key filing fact

Terrance McGuire filed Form 4 for Seer, Inc. (SEER) on 11 Dec 2025.

Key facts

This page summarizes Terrance McGuire's Form 4 filing for Seer, Inc. (SEER).
2 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 11 Dec 2025, 20:40.

Change

Previous filing in this sequence was filed on 09 Jul 2025.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001117003 Primary reporting owner

MCGUIRE TERRANCE

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

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

SEER transaction

Class A Common Stock

Conversion of derivative security

Transaction value
Shares: +4,088
Change %: +1.9%
Price
Shares after: 215,070
Date: 09 Dec 2025
Ownership: See footnote
Footnotes: F1, F2

SEER holding

Class A Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 112,066
Date: 09 Dec 2025
Ownership: Direct

SEER holding

Class A Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 78,947
Date: 09 Dec 2025
Ownership: See footnote
Footnotes: F3

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

SEER transaction Derivative

Class B Common Stock

Conversion of derivative security

Transaction value: $0
Shares: -4,088
Change %: -100%
Price: $0.000000
Shares after: 0
Date: 09 Dec 2025
Ownership: See footnote
Underlying class: Class A Common Stock
Underlying amount: 4,088
Exercise price
Footnotes: F1, F2

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 3 footnotes

Footnote 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.

Footnote F2

The reported shares are held of record by Strong Bridge, LLC for which the Reporting Person serves as an operating manager.

Footnote 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.