SCHEDULE 13G Filed 2026-10-26 Event — SEC 0001346824-26-000247 →

RA CAPITAL MANAGEMENT, L.P. → Alector, Inc. ALEC

Stake: — Shares: — Class: Common Stock, $0.0001 par value per share

Composite Decision Signal · PASS (LOW BASE-RATE EDGE) Conviction Score: 17/100 · Filer 90d Win Rate: 0% · Hist. 90d Edge: +0.0%

Filer track record (20 filings): 0% 90d win rate, +0.0% 90d edge
Material 8-K governance/transaction event (Item 5.02 / 1.01 / 2.01) within ±30d
Held by 1 tracked 13F institutional manager
Short interest building (+66.8% vs prior settlement)

Item 4 — Purpose of Transaction

Not extracted from this filing — typically because it's an amendment (13D/A) and Item 4 is unchanged from the parent filing. Read the raw SEC filing →

Cross-References

Insider Activity (last 365d)

0 transactions

0 buys · 0 sales · 0 awards/exercises

Issuer Cluster

10 13D/G filings on this issuer

9 other filings besides this one

Filer Track Record

88 filings by this filer

87 other filings in the data moat

Short Interest · settle 2026-10-15

DTC 1.00

10,254,239 shares short · +66.8% vs prior

Institutional Consensus · 2025-12-31

Held by elite portfolio managers

1 holder · $36K

Point72 Asset Mgmt

Other 13D/G Filings on Alector, Inc.

Filed	Form	Filer	Stake	Shares
2026-10-23	SCHEDULE 13G	Deep Track Capital, LP	—	—	view →
2026-09-18	SCHEDULE 13G	BIOTECHNOLOGY VALUE FUND L P	—	—	view →
2020-07-10	SC	ORBIMED ADVISORS LLC	—	—	view →
2020-06-04	SC	ORBIMED ADVISORS LLC	—	—	view →
2020-03-04	SC	ORBIMED ADVISORS LLC	—	—	view →
2020-02-05	SC	ORBIMED ADVISORS LLC	—	—	view →
2020-01-13	SC	ORBIMED ADVISORS LLC	—	—	view →
2019-12-19	SC	ORBIMED ADVISORS LLC	—	—	view →
2019-08-12	SC	ORBIMED ADVISORS LLC	—	—	view →

Other Filings by RA CAPITAL MANAGEMENT, L.P.

Filed	Form	Issuer	Stake	Shares
2026-10-22	SCHEDULE 13G	Frazier Life Sciences Acquisition Corp. II	—	—	view →
2026-09-22	SCHEDULE 13G	BetterLife Pharma Inc.	—	—	view →
2026-09-21	SCHEDULE 13D/A	SIONNA THERAPEUTICS, INC.	14.30%	6,476,193	view →
2026-09-17	SCHEDULE 13D/A	TYRA BIOSCIENCES, INC.	—	14,130,492	view →
2026-09-03	SCHEDULE 13G	JATT III Acquisition Corp	—	—	view →
2026-08-17	SCHEDULE 13G	Latigo Biotherapeutics, Inc.	—	—	view →
2026-08-14	SCHEDULE 13D/A	SEPTERNA, INC.	—	5,525,324	view →
2026-08-11	SCHEDULE 13D/A	Wave Life Sciences, Inc.	—	34,314,406	view →
2026-08-10	SCHEDULE 13D/A	SAB Biotherapeutics, Inc.	—	9,609,852	view →
2026-07-23	SCHEDULE 13D/A	ARTIVA BIOTHERAPEUTICS, INC.	—	18,415,956	view →
2026-07-22	SCHEDULE 13D/A	Freenome, Inc.	—	15,367,270	view →
2026-07-21	SCHEDULE 13D/A	VOR BIOPHARMA INC.	—	12,937,855	view →
2026-07-20	SCHEDULE 13G	Agenus Inc.	—	—	view →
2026-07-07	SCHEDULE 13D/A	Climb Bio, Inc. CLYM	33.00%	23,249,186	view →
2026-07-02	SCHEDULE 13D/A	WEREWOLF THERAPEUTICS, INC. HOWL	4.10%	1,985,541	view →
2026-06-26	SCHEDULE 13D/A	WEREWOLF THERAPEUTICS, INC. HOWL	6.00%	2,915,742	view →
2026-06-24	SCHEDULE 13D/A	SOLID BIOSCIENCES INC. SLDB	—	12,036,126	view →
2026-06-22	SCHEDULE 13D/A	WEREWOLF THERAPEUTICS, INC. HOWL	—	3,654,307	view →
2026-06-18	SCHEDULE 13D	Parabilis Medicines, Inc. PBLS	23.80%	28,933,371	view →
2026-06-15	SCHEDULE 13D/A	WEREWOLF THERAPEUTICS, INC. HOWL	—	5,138,703	view →

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