Bradley L. Radoff - 26 Feb 2026 SCHEDULE 13D/A Report for Seer, Inc. Class A Common Stock, par value $0.00001 per share (SEER)

Filing manager: Bradley L. Radoff
Reporting owner: Radoff Bradley Louis
Security: Seer, Inc. Class A Common Stock, par value $0.00001 per share
Beneficially owned shares: 2,610,232 shares
Large-stake signal: Form
SCHEDULE 13D/A
Active or control-oriented beneficial ownership filing.
Ownership
4.6%
Beneficial ownership of this reported class.
Shares
2,610,232 shares
Shares beneficially owned as disclosed.
Event date
26 Feb 2026
Date tied to the ownership event or amendment.
Accepted by SEC
02 Mar 2026
EDGAR acceptance date.
How to read this large-stake filing
Schedule 13D/G filings focus on beneficial ownership stakes, not a full portfolio.
Compare this filing with the holder history and issuer page before treating the percentage as a current position.
Use amendments to understand whether the disclosed stake increased, decreased, or changed reporting status.
Class ownership: 4.6%
Symbol: SEER
Shares outstanding: 56,744,174 shares
SEC form: SCHEDULE 13D/A
Accepted by SEC: 02 Mar 2026, 17:19:01 UTC
Event date: 26 Feb 2026
Prior SEC filing: 20 Feb 2026
Next SEC filing: 13 Apr 2026
Source filing: View source filing

Key filing fact

Bradley L. Radoff disclosed 4.6% ownership in Seer, Inc. Class A Common Stock, par value $0.00001 per share (SEER) on 26 Feb 2026.

Key facts

Bradley L. Radoff filed SCHEDULE 13D/A for Seer, Inc. Class A Common Stock, par value $0.00001 per share (SEER).
Disclosed ownership: 4.6%.
Date of event: 26 Feb 2026.

This page turns one Schedule 13D/G filing into a quick large-stake read before the raw reporting-person rows.
Use the linked SEC filing as the source of truth for ownership percentages, shares, and reporting-party details.

Backed by Schedule 13D/13G

Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.

Reporting persons

Names, ownership percentages, voting power, signatures, titles, and CIKs as disclosed in this Schedule 13D/G filing.

Name	Ownership	Shares owned	Sole voting power	Shared voting power	Signature	Title	CIK
Radoff Family Foundation	0.9%	500,000	0	500,000	/s/ Bradley L. Radoff	Bradley L. Radoff, Director	0001496916
Radoff Bradley Louis	4.6%	2,610,232	2,110,232	500,000	/s/ Bradley L. Radoff	Bradley L. Radoff	0001380585
JEC II Associates, LLC	2.1%	1,167,296	0	1,167,296	/s/ Michael Torok	Michael Torok, Manager	0001477326
The MOS Trust	0.4%	215,000	0	215,000	/s/ Michael Torok	Michael Torok, Manager of MOS PTC, LLC, its Trustee
MOS PTC, LLC	0.4%	215,000	0	215,000	/s/ Michael Torok	Michael Torok, Manager
Torok Michael	3%	1,667,296	285,000	1,382,296	/s/ Michael Torok	Michael Torok	0001967237

CIK / CUSIP context first

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