Polaris Venture Partners VI, L.P. - 30 Sep 2025 SCHEDULE 13G/A Report for Alector, Inc. Common Stock, $0.0001 par value per share (ALEC)

Filing Manager
Polaris Venture Partners VI, L.P.
Reporting Manager
Terrance G. McGuire
Security
Alector, Inc. Common Stock, $0.0001 par value per share
Symbol
ALEC
Shares outstanding
109,157,708 shares
Disclosed Ownership
7,095,251 shares
Ownership
6.5%
Form type
SCHEDULE 13G/A
Filing time
13 Nov 2025, 16:41:55 UTC
Date of event
30 Sep 2025
SEC
View on sec.gov

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Quoteable Key Fact

"Polaris Venture Partners VI, L.P. disclosed 6.5% ownership in Alector, Inc. Common Stock, $0.0001 par value per share (ALEC) on 30 Sep 2025."

Quick Takeaways

  • Polaris Venture Partners VI, L.P. filed SCHEDULE 13G/A for Alector, Inc. Common Stock, $0.0001 par value per share (ALEC).
  • Disclosed ownership: 6.5%.
  • Date of event: 30 Sep 2025.

What Changed

  • No earlier schedule filing is available for direct comparison.
  • Current filing was accepted on 13 Nov 2025, 16:41.

Why This Matters

  • This page explains what this Schedule 13D/13G filing tells you before manager-level rows.
  • You can verify ownership claims directly against the original SEC filing.

Official SEC Source

Backed by Schedule 13D/13G

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

See Original Filing

Reporting Managers (11)

Name Ownership Shares Owned sole voting power shared voting power Signature Title CIK
Polaris Venture Partners VI, L.P. 0.5% 498,468 498,468 0 /s/ Lauren Crockett Lauren Crockett/ Authorized Signatory of Polaris Venture Management Co. VI, L.L.C., general partner of Polaris Venture Partners VI, L.P.
Polaris Venture Partners Founders' Fund VI, L.P. 0.3% 378,403 378,403 0 /s/ Lauren Crockett Lauren Crockett/ Authorized Signatory of Polaris Venture Management Co. VI, L.L.C., GP of Polaris Venture Partners Founders' Fund VI, L.P.
Polaris Venture Partners VI (AIV), L.P. 4.4% 4,797,563 4,797,563 0 /s/ Lauren Crockett Lauren Crockett/ Authorized Signatory of Polaris Venture Management Co. VI, L.L.C., general partner of Polaris Venture Partners VI (AIV), L.P.
Polaris Venture Partners VI (AIV-B), L.P. 1.1% 1,179,383 1,179,383 0 /s/ Lauren Crockett Lauren Crockett/ Authorized Signatory of Polaris Venture Management Co. VI, L.L.C., general partner of Polaris Venture Partners VI (AIV-B), L.P.
Polaris Venture Management Co VI, L.L.C. 6.3% 6,853,817 0 6,853,817 /s/ Lauren Crockett Lauren Crockett/ Authorized Signatory*
David Barrett 6.3% 6,880,071 26,254 6,853,817 /s/ Lauren Crockett Lauren Crockett/ Attorney-In-Fact
Brian Chee 6.3% 6,880,084 26,267 6,853,817 /s/ Lauren Crockett Lauren Crockett/ Attorney-In-Fact
Jonathan A. Flint 6.3% 6,892,942 39,125 6,853,817 /s/ Lauren Crockett Lauren Crockett/ Attorney-In-Fact
Terrance G. McGuire 6.5% 7,095,251 241,434 6,853,817 /s/ Lauren Crockett Lauren Crockett/ Attorney-In-Fact
Amir Nashat 6.4% 6,932,617 78,800 6,853,817 /s/ Lauren Crockett Lauren Crockett/ Attorney-In-Fact
Bryce Youngren 6.4% 6,945,149 91,332 6,853,817 /s/ Lauren Crockett Lauren Crockett/ Attorney-In-Fact

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