What does CUSIP 014442107 represent in this 13F holders report?

CUSIP 014442107 is the security identifier for ALEC - Alector, Inc. - Common Stock, $0.0001 par value per share used to aggregate holder disclosures.

How many institutions held ALEC - Alector, Inc. - Common Stock, $0.0001 par value per share in Q1 2025?

139 institutional investors reported ALEC - Alector, Inc. - Common Stock, $0.0001 par value per share for Q1 2025. Use the holders table for investor-level position and value details.

Alector, Inc. - Common Stock, $0.0001 par value per share (ALEC)

CUSIP: 014442107

Q1 2025 13F Holders as of 31 Mar 2025

Security type / class: Equity / Common Stock, $0.0001 par value per share
Total 13F shares: 72,505,139
Total 13F value: $89,184,395
Share change: -781,492
Put/Call ratio: 41%
SEC-reported price per share: $1.23
Number of holders: 139
Value change: -$1,704,057
Number of buys: 63
Number of sells: 60
Shares outstanding: 147,058,824

Security key

014442107

Report period

Q1 2025

Institutions

139

Top holders

ALEC full security history Ownership snapshot Full 13F holder table Newer quarter: Q3 2026 Alector, Inc. SEC filings Alector, Inc. company facts

Broader feeds

Latest 13F filings Latest 13D/G filings Investors directory

Reporting periods

Holder history for CUSIP 014442107

Newer quarter: Q3 2026

Recent filing periods:

Q3 2026

Ownership snapshot

Top reported holders of ALEC - Alector, Inc. - Common Stock, $0.0001 par value per share (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.

Comparable stake leader

Polaris Venture Managemen...

Disclosed value leader

Polaris Venture Managemen...

Comparable rows

0/15

Latest evidence

31 Dec 2024

3/4/5 13F Highest disclosed value: $68,200,238 15 rows are not safely comparable across share classes. Showing 1-6 of 15 holder rows.

Quick read

Polaris Venture Management Co. VI, L.L.C. has the largest disclosed position value at $68.2M.

0 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.

Open SEC evidence Opens Polaris Venture Management Co. VI, L.L.C.'s linked filing trail.

Disclosed position value Top 5

Polaris Venture Management Co. VI... $68.2M

Terrance McGuire $60.65M

RA CAPITAL MANAGEMENT, L.P. $18.32M

BlackRock, Inc. $17.27M

Tillman U. Gerngross $14.7M

Value bars compare disclosed positions; verify each figure against the linked filing evidence.

Detailed SEC evidence table Showing 1-6 of 15 holder rows

Holder	Evidence	Ownership %	Position	12M Net Δ	As of
Polaris Venture Management Co. VI, L.L.C.	3/4/5 10%+ Owner 3/4/5	— denominator unverified	$68,200,238 9,853,817 shares	—	29 May 2024
Terrance McGuire	3/4/5 Director, 10%+ Owner 3/4/5	— denominator unverified	$60,653,001 10,908,813 shares	—	11 Sep 2023
RA CAPITAL MANAGEMENT, L.P.	13F Company 13F	— denominator unverified	$18,323,981 9,695,228 shares	—	31 Dec 2024
BlackRock, Inc.	13F Company 13F	— denominator unverified	$17,268,452 9,136,747 shares	—	31 Dec 2024
Tillman U. Gerngross	3/4/5 Director 3/4/5	— mixed-class rows	$14,702,414 2,656,679 shares mixed-class rows	—	14 Jun 2023
VANGUARD GROUP INC	13F Company 13F	— denominator unverified	$10,614,955 5,616,379 shares	—	31 Dec 2024

How to read this table

Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

13F holder rows

Institutional holders as of Q1 2025

Investor-level positions for this CUSIP, loaded as an interactive table.

Institutions

139

72,505,139

Rows available

139

Investor	Option	Weight %	Change %	SEC-reported value	* Price	Shares	Share Change	Activity	Report Period

^* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.

Compare Q1 2025 vs Q1 2025 Across Filers

Q1 2025 holders

139

Q1 2025 holders

139

Holder diff

Investor	Q1 2025 Shares	Q1 2025 Shares	Share Diff	Share Chg %	Q1 2025 value	Q1 2025 value	Value change	Value Chg %

Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).

Quarterly Holders Trend

Quarterly Value Trend

Quarterly Shares Trend