Alector, Inc. - ALEC

Ownership (Schedule 13D / 13G) · latest 50 filings · Back to all files

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Filed	Form	Reporting person	Percent	Shares	SEC
Sep 18, 2026	SCHEDULE 13G	BIOTECHNOLOGY VALUE FUND L P	4.4%	4,900,143	View
Sep 18, 2026	SCHEDULE 13G	BVF I GP LLC	4.4%	4,900,143	View
Sep 18, 2026	SCHEDULE 13G	BIOTECHNOLOGY VALUE FUND II LP	3.3%	3,671,016	View
Sep 18, 2026	SCHEDULE 13G	BVF II GP LLC	3.3%	3,671,016	View
Sep 18, 2026	SCHEDULE 13G	Biotechnology Value Trading Fund OS LP	0.6%	619,317	View
Sep 18, 2026	SCHEDULE 13G	BVF Partners OS Ltd.	0.6%	619,317	View
Sep 18, 2026	SCHEDULE 13G	BVF GP HOLDINGS LLC	7.7%	8,571,159	View
Sep 18, 2026	SCHEDULE 13G	BVF PARTNERS L P/IL	8.4%	9,374,267	View
Sep 18, 2026	SCHEDULE 13G	BVF INC/IL	8.4%	9,374,267	View
Sep 18, 2026	SCHEDULE 13G	LAMPERT MARK N	8.4%	9,374,267	View
May 14, 2026	SCHEDULE 13G/A	Polaris Venture Partners VI, L.P.	0.5%	498,468	View
May 14, 2026	SCHEDULE 13G/A	Polaris Venture Partners Founders' Fund VI, L.P.	0.2%	267,979	View
May 14, 2026	SCHEDULE 13G/A	Polaris Venture Partners VI (AIV), L.P.	3.0%	3,280,842	View
May 14, 2026	SCHEDULE 13G/A	Polaris Venture Partners VI (AIV-B), L.P.	0.7%	806,528	View
May 14, 2026	SCHEDULE 13G/A	Polaris Venture Management Co VI, L.L.C.	4.4%	4,853,817	View
May 14, 2026	SCHEDULE 13G/A	David Barrett	4.4%	4,853,817	View
May 14, 2026	SCHEDULE 13G/A	Brian Chee	4.4%	4,853,817	View
May 14, 2026	SCHEDULE 13G/A	Jonathan A. Flint	4.4%	4,892,941	View
May 14, 2026	SCHEDULE 13G/A	Terrance G. McGuire	4.7%	5,173,499	View
May 14, 2026	SCHEDULE 13G/A	Amir Nashat	4.5%	4,985,149	View
May 14, 2026	SCHEDULE 13G/A	Bryce Youngren	4.4%	4,865,681	View
Apr 27, 2026	SCHEDULE 13G	BlackRock, Inc.	5.2%	5,784,214	View
Mar 26, 2026	SCHEDULE 13G/A	The Vanguard Group	0.0%	0	View

Percent = "% of class represented by amount beneficially owned" for this reporting person in the filed 13D/13G. Shares = reported beneficial ownership amount for the same row (not portfolio shares from 13F). Amendments (/A) can repeat the same holder over time, so rows should not be summed. Extraction is best-effort from filing text and can be missing or noisy; verify exact figures via the SEC link in each row.