Alector, Inc. amendment to a previously filed Schedule 13G/A updates beneficial ownership information for Polaris-related entities and specified individuals as of April 30, 2026.
The filing lists holdings across Polaris funds: Polaris Venture Partners VI (498,468 shares, 0.5%), Polaris Venture Partners Founders' Fund VI (267,979 shares, 0.2%), PVP VI (AIV) (3,280,842 shares, 3.0%), and PVP VI (AIV-B) (806,528 shares, 0.7%). Polaris Venture Management Co. VI, L.L.C. reports shared voting/dispositive power over 4,853,817 shares (4.4%), based on 110,362,581 shares outstanding as of February 20, 2026 per the annual report cited.
Named individuals—David Barrett, Brian Chee, Jonathan A. Flint, Terrance G. McGuire, Amir Nashat, and Bryce Youngren—are reported with shared voting and dispositive power attributable to their roles at Polaris. Mr. McGuire's total includes 26,250 restricted stock units, producing a combined figure that the amendment cites as 110,388,831 when calculating his percent figure.
Positive
None.
Negative
None.
Insights
Updated 13G/A shows concentrated Polaris ownership and shared control via the management company.
The amendment clarifies that multiple Polaris funds collectively account for 4,853,817 shares of common stock (reported shared power). This figure is tied to the issuer's disclosed outstanding share count of 110,362,581 as of February 20, 2026.
Implications hinge on voting coordination among the managing members named; subsequent filings could show changes in holdings or voting alignment. Future disclosures may report transactions if any holder crosses reportable thresholds.
The filing attributes sole and shared voting/dispositive power precisely by entity and individual, including per-entity share counts such as 3,280,842 shares for PVP VI (AIV). The amendment notes that percentages use the Form 10-K outstanding share figure.
For accuracy, watch for any future amendments that update the outstanding share base or report open-market transactions; this filing itself reports ownership, not market activity.
Key Figures
Outstanding shares (issuer cited):110,362,581 sharesPolaris shared voting/dispositive power:4,853,817 sharesPVP VI (AIV) holdings:3,280,842 shares+5 more
8 metrics
Outstanding shares (issuer cited)110,362,581 sharesas of <date>February 20, 2026</date> per Form 10-K
"This Amendment No. 7 amends and supplements the initially filed"
A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.
shared dispositive powerregulatory
"Shared Dispositive Power 4,853,817.00"
restricted stock unitsfinancial
"26,250 shares that represent restricted stock units that have been granted"
Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.
beneficial ownershipregulatory
"Amount beneficially owned: See Row 9 of cover page for each Reporting Person"
Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
(Amendment No. 7)
Alector, Inc.
(Name of Issuer)
Common Stock, $0.0001 par value per share
(Title of Class of Securities)
014442107
(CUSIP Number)
03/31/2026
(Date of Event Which Requires Filing of this Statement)
Check the appropriate box to designate the rule pursuant to which this Schedule is filed:
Rule 13d-1(b)
Rule 13d-1(c)
Rule 13d-1(d)
schemaVersion:
SCHEDULE 13G
CUSIP Number(s):
014442107
1
Names of Reporting Persons
Polaris Venture Partners VI, L.P.
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
498,468.00
6
Shared Voting Power
0.00
7
Sole Dispositive Power
498,468.00
8
Shared Dispositive Power
0.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
498,468.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
0.5 %
12
Type of Reporting Person (See Instructions)
PN
Comment for Type of Reporting Person: All shares are held of record by PVP VI (as defined in Item 2(a) of the Original Schedule 13G (as defined below)). PVM VI (as defined in Item 2(a) of the Original Schedule 13G), the general partner of PVP VI, may be deemed to have voting, investment and dispositive power with respect to these securities. David Barrett, Brian Chee, Jonathan A. Flint, Terrance G. McGuire, Amir Nashat, and Bryce Youngren are the managing members of PVM VI and may each be deemed to share voting, investment and dispositive power with respect to these securities.
The percentage in Row 11 is based on 110,362,581 shares of the Issuer's common stock ("Common Stock") outstanding as of February 20, 2026, as set forth in the Issuer's annual report on Form 10-K for the year ended December 31, 2026, filed with the United States Securities and Exchange Commission (the "Commission") on February 25, 2026 (the "Form 10-K").
SCHEDULE 13G
CUSIP Number(s):
014442107
1
Names of Reporting Persons
Polaris Venture Partners Founders' Fund VI, L.P.
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
267,979.00
6
Shared Voting Power
0.00
7
Sole Dispositive Power
267,979.00
8
Shared Dispositive Power
0.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
267,979.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
0.2 %
12
Type of Reporting Person (See Instructions)
PN
Comment for Type of Reporting Person: All shares are held of record by PVPFF VI (as defined in Item 2(a) of the Original Schedule 13G). PVM VI, the general partner of PVPFF VI, may be deemed to have voting, investment and dispositive power with respect to these securities. David Barrett, Brian Chee, Jonathan A. Flint, Terrance G. McGuire, Amir Nashat, and Bryce Youngren are the managing members of PVM VI and may each be deemed to share voting, investment and dispositive power with respect to these securities.
The percentage in Row 11 is based on 110,362,581 shares of Common Stock outstanding as of February 20, 2026, as set forth in the Form 10-K.
SCHEDULE 13G
CUSIP Number(s):
014442107
1
Names of Reporting Persons
Polaris Venture Partners VI (AIV), L.P.
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
3,280,842.00
6
Shared Voting Power
0.00
7
Sole Dispositive Power
3,280,842.00
8
Shared Dispositive Power
0.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
3,280,842.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
3.0 %
12
Type of Reporting Person (See Instructions)
PN
Comment for Type of Reporting Person: All shares are held of record by PVP VI (AIV) (as defined in Item 2(a) of the Original Schedule 13G). PVM VI, the general partner of PVP VI (AIV), may be deemed to have voting, investment and dispositive power with respect to these securities. David Barrett, Brian Chee, Jonathan A. Flint, Terrance G. McGuire, Amir Nashat, and Bryce Youngren are the managing members of PVM VI and may each be deemed to share voting, investment and dispositive power with respect to these securities.
The percentage in Row 11 is based on 110,362,581 shares of Common Stock outstanding as of February 20, 2026, as set forth in the Form 10-K.
SCHEDULE 13G
CUSIP Number(s):
014442107
1
Names of Reporting Persons
Polaris Venture Partners VI (AIV-B), L.P.
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
806,528.00
6
Shared Voting Power
0.00
7
Sole Dispositive Power
806,528.00
8
Shared Dispositive Power
0.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
806,528.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
0.7 %
12
Type of Reporting Person (See Instructions)
PN
Comment for Type of Reporting Person: All shares are held of record by PVP VI (AIV-B) (as defined in Item 2(a) of the Original Schedule 13G). PVM VI, the general partner of PVP VI (AIV-B), may be deemed to have voting, investment and dispositive power with respect to these securities. David Barrett, Brian Chee, Jonathan A. Flint, Terrance G. McGuire, Amir Nashat, and Bryce Youngren are the managing members of PVM VI and may each be deemed to share voting, investment and dispositive power with respect to these securities.
The percentage in Row 11 is based on 110,362,581 shares of Common Stock outstanding as of February 20, 2026, as set forth in the Form 10-K.
SCHEDULE 13G
CUSIP Number(s):
014442107
1
Names of Reporting Persons
Polaris Venture Management Co VI, L.L.C.
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
4,853,817.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
4,853,817.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
4,853,817.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
4.4 %
12
Type of Reporting Person (See Instructions)
OO
Comment for Type of Reporting Person: The shares reported in Rows 6 and 8 consist of (i) 498,468 shares held of record by PVP VI, (ii) 267,979 shares held of record by PVPFF VI, (iii) 3,280,842 shares held of record by PVP VI (AIV) and (iv) 806,528 shares held of record by PVP VI (AIV-B). PVM VI, the general partner of each of PVP VI, PVPFF VI, PVP VI (AIV) and PVP VI (AIV-B), may be deemed to have voting, investment and dispositive power with respect to these securities. David Barrett, Brian Chee, Jonathan A. Flint, Terrance G. McGuire, Amir Nashat, and Bryce Youngren are the managing members of PVM VI and may each be deemed to share voting, investment and dispositive power with respect to these securities.
The percentage in Row 11 is based on 110,362,581 shares of Common Stock outstanding as of February 20, 2026, as set forth in the Form 10-K.
SCHEDULE 13G
CUSIP Number(s):
014442107
1
Names of Reporting Persons
David Barrett
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
UNITED STATES
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
4,853,817.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
4,853,817.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
4,853,817.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
4.4 %
12
Type of Reporting Person (See Instructions)
IN
Comment for Type of Reporting Person: The shares reported in Rows 6 and 8 consist of (i) 498,468 shares held of record by PVP VI, (ii) 267,979 shares held of record by PVPFF VI, (iii) 3,280,842 shares held of record by PVP VI (AIV) and (iv) 806,528 shares held of record by PVP VI (AIV-B). PVM VI, the general partner of each of PVP VI, PVPFF VI, PVP VI (AIV) and PVP VI (AIV-B), may be deemed to have voting, investment and dispositive power with respect to these securities. David Barrett, Brian Chee, Jonathan A. Flint, Terrance G. McGuire, Amir Nashat, and Bryce Youngren are the managing members of PVM VI and may each be deemed to share voting, investment and dispositive power with respect to these securities.
The percentage in Row 11 is based on 110,362,581 shares of Common Stock outstanding as of February 20, 2026, as set forth in the Form 10-K.
SCHEDULE 13G
CUSIP Number(s):
014442107
1
Names of Reporting Persons
Brian Chee
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
UNITED STATES
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
4,853,817.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
4,853,817.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
4,853,817.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
4.4 %
12
Type of Reporting Person (See Instructions)
IN
Comment for Type of Reporting Person: The shares reported in Rows 6 and 8 consist of (i) 498,468 shares held of record by PVP VI, (ii) 267,979 shares held of record by PVPFF VI, (iii) 3,280,842 shares held of record by PVP VI (AIV) and (iv) 806,528 shares held of record by PVP VI (AIV-B). PVM VI, the general partner of each of PVP VI, PVPFF VI, PVP VI (AIV) and PVP VI (AIV-B), may be deemed to have voting, investment and dispositive power with respect to these securities. David Barrett, Brian Chee, Jonathan A. Flint, Terrance G. McGuire, Amir Nashat, and Bryce Youngren are the managing members of PVM VI and may each be deemed to share voting, investment and dispositive power with respect to these securities.
The percentage in Row 11 is based on 110,362,581 shares of Common Stock outstanding as of February 20, 2026, as set forth in the Form 10-K.
SCHEDULE 13G
CUSIP Number(s):
014442107
1
Names of Reporting Persons
Jonathan A. Flint
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
UNITED STATES
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
39,124.00
6
Shared Voting Power
4,853,817.00
7
Sole Dispositive Power
39,124.00
8
Shared Dispositive Power
4,853,817.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
4,892,941.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
4.4 %
12
Type of Reporting Person (See Instructions)
IN
Comment for Type of Reporting Person: The shares reported in Rows 5 and 7 are held directly by Jonathan A. Flint.
The shares reported in Rows 6 and 8 consist of (i) 498,468 shares held of record by PVP VI, (ii) 267,979 shares held of record by PVPFF VI, (iii) 3,280,842 shares held of record by PVP VI (AIV) and (iv) 806,528 shares held of record by PVP VI (AIV-B). PVM VI, the general partner of each of PVP VI, PVPFF VI, PVP VI (AIV) and PVP VI (AIV-B), may be deemed to have voting, investment and dispositive power with respect to these securities. David Barrett, Brian Chee, Jonathan A. Flint, Terrance G. McGuire, Amir Nashat, and Bryce Youngren are the managing members of PVM VI and may each be deemed to share voting, investment and dispositive power with respect to these securities.
The percentage in Row 11 is based on 110,362,581 shares of Common Stock outstanding as of February 20, 2026, as set forth in the Form 10-K.
SCHEDULE 13G
CUSIP Number(s):
014442107
1
Names of Reporting Persons
Terrance G. McGuire
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
UNITED STATES
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
319,682.00
6
Shared Voting Power
4,853,817.00
7
Sole Dispositive Power
319,682.00
8
Shared Dispositive Power
4,853,817.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
5,173,499.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
4.7 %
12
Type of Reporting Person (See Instructions)
IN
Comment for Type of Reporting Person: The shares reported in Rows 5 and 7 consist of (i) 96,435 shares held directly by Terrance G. McGuire, (ii) 196,997 shares held by McGuire Family Trust, and (iii) 26,250 shares consist of restricted stock units that have been granted to Terrance G. McGuire in his capacity as a former director of the Issuer. Terrance G. McGuire is the donor of the McGuire Family Trust and may be deemed to share voting, investment and dispositive power with respect to the shares held by the McGuire Family Trust.
The shares reported in Rows 6 and 8 consist of (i) 498,468 shares held of record by PVP VI, (ii) 267,979 shares held of record by PVPFF VI (iii) 3,280,842 shares held of record by PVP VI (AIV) and (iv) 806,528 shares held of record by PVP VI (AIV-B). PVM VI, the general partner of each of PVP VI, PVPFF VI, PVP VI (AIV) and PVP VI (AIV-B), may be deemed to have voting, investment and dispositive power with respect to these securities. David Barrett, Brian Chee, Jonathan A. Flint, Terrance G. McGuire, Amir Nashat, and Bryce Youngren are the managing members of PVM VI and may each be deemed to share voting, investment and dispositive power with respect to these securities.
The percentage in Row 11 is based on 110,388,831 shares of Common Stock, calculated as follows: (i) 26,250 shares that represent restricted stock units that have been granted to Mr. McGuire in his capacity as a former director of the Issuer plus (ii) 110,362,581 shares of Common Stock outstanding as of February 20, 2026, as set forth in the Form 10-K.
SCHEDULE 13G
CUSIP Number(s):
014442107
1
Names of Reporting Persons
Amir Nashat
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
UNITED STATES
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
131,332.00
6
Shared Voting Power
4,853,817.00
7
Sole Dispositive Power
131,332.00
8
Shared Dispositive Power
4,853,817.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
4,985,149.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
4.5 %
12
Type of Reporting Person (See Instructions)
IN
Comment for Type of Reporting Person: The shares reported in Rows 5 and 7 are held directly by Amir Nashat.
The shares reported in Rows 6 and 8 consist of (i) 498,468 shares held of record by PVP VI, (ii) 267,979 shares held of record by PVPFF VI, (iii) 3,280,842 shares held of record by PVP VI (AIV) and (iv) 806,528 shares held of record by PVP VI (AIV-B). PVM VI, the general partner of each of PVP VI, PVPFF VI, PVP VI (AIV) and PVP VI (AIV-B), may be deemed to have voting, investment and dispositive power with respect to these securities. David Barrett, Brian Chee, Jonathan A. Flint, Terrance G. McGuire, Amir Nashat, and Bryce Youngren are the managing members of PVM VI and may each be deemed to share voting, investment and dispositive power with respect to these securities.
The percentage in Row 11 is based on 110,362,581 shares of Common Stock outstanding as of February 20, 2026, as set forth in the Form 10-K.
SCHEDULE 13G
CUSIP Number(s):
014442107
1
Names of Reporting Persons
Bryce Youngren
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
UNITED STATES
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
11,864.00
6
Shared Voting Power
4,853,817.00
7
Sole Dispositive Power
11,864.00
8
Shared Dispositive Power
4,853,817.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
4,865,681.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
4.4 %
12
Type of Reporting Person (See Instructions)
IN
Comment for Type of Reporting Person:
The shares reported in Rows 5 and 7 are held directly by Bryce Youngren.
The shares reported in Rows 6 and 8 consist of (i) 498,468 shares held of record by PVP VI, (ii) 267,979 shares held of record by PVPFF VI, (iii) 3,280,842 shares held of record by PVP VI (AIV) and (iv) 806,528 shares held of record by PVP VI (AIV-B). PVM VI, the general partner of each of PVP VI, PVPFF VI, PVP VI (AIV) and PVP VI (AIV-B), may be deemed to have voting, investment and dispositive power with respect to these securities. David Barrett, Brian Chee, Jonathan A. Flint, Terrance G. McGuire, Amir Nashat, and Bryce Youngren are the managing members of PVM VI and may each be deemed to share voting, investment and dispositive power with respect to these securities.
The percentage in Row 11 is based on 110,362,581 shares of Common Stock outstanding as of February 20, 2026, as set forth in the Form 10-K.
SCHEDULE 13G
Item 1.
(a)
Name of issuer:
Alector, Inc.
(b)
Address of issuer's principal executive offices:
131 OYSTER POINT BLVD., SUITE 600, SOUTH SAN FRANCISCO, CA, 94080
Item 2.
(a)
Name of person filing:
This Amendment No. 7 (this "Amendment") amends and supplements the Schedule 13G initially filed with the Commission on February 12, 2020, as amended by Amendment No. 1 filed with the Commission on February 12, 2021, Amendment No. 2 filed with the Commission on February 11, 2022, Amendment No. 3 filed with the Commission on February 7, 2023, Amendment No. 4 filed with the Commission on February 9, 2024, Amendment No. 5 filed with the Commission on November 12, 2024, and Amendment No. 6 filed with the Commission on November 13, 2025 (collectively, the "Original Schedule 13G"). Only those items that are hereby reported are amended; all other items reported in the Original Schedule 13G remain unchanged. Information given in response to each item shall be deemed incorporated by reference in all other items, as applicable. Capitalized terms not defined in this Amendment have the meanings ascribed to them in the Original Schedule 13G.
The following information in Item 4 with respect to the ownership of the Issuer's Common Stock by the Reporting Persons filing this Amendment No. 7 is provided as of April 30, 2026. Each of the Reporting Persons disclaims beneficial ownership of the shares of Common Stock reported in this Amendment No. 7, except for the shares, if any, such Reporting Person holds of record and to the extent of such Reporting Person's pecuniary interest therein.
(b)
Address or principal business office or, if none, residence:
(c)
Citizenship:
(d)
Title of class of securities:
Common Stock, $0.0001 par value per share
(e)
CUSIP No.:
014442107
Item 4.
Ownership
(a)
Amount beneficially owned:
See Row 9 of cover page for each Reporting Person and the corresponding footnotes.
(b)
Percent of class:
See Row 11 of cover page for each Reporting Person and the corresponding footnotes.
(c)
Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:
See Row 5 of cover page for each Reporting Person and the corresponding footnotes.
(ii) Shared power to vote or to direct the vote:
See Row 6 of cover page for each Reporting Person and the corresponding footnotes.
(iii) Sole power to dispose or to direct the disposition of:
See Row 7 of cover page for each Reporting Person and the corresponding footnotes.
(iv) Shared power to dispose or to direct the disposition of:
See Row 8 of cover page for each Reporting Person and the corresponding footnotes.
Item 5.
Ownership of 5 Percent or Less of a Class.
Ownership of 5 percent or less of a class
Item 10.
Certifications:
Not Applicable
SIGNATURE
After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.
Polaris Venture Partners VI, L.P.
Signature:
/s/ Lauren Crockett
Name/Title:
Lauren Crockett/ Authorized Signatory of Polaris Venture Management Co. VI, L.L.C., general partner of Polaris Venture Partners VI, L.P.
Date:
05/14/2026
Polaris Venture Partners Founders' Fund VI, L.P.
Signature:
/s/ Lauren Crockett
Name/Title:
Lauren Crockett/ Authorized Signatory of Polaris Venture Management Co. VI, L.L.C., GP of Polaris Venture Partners Founders' Fund VI, L.P.
Date:
05/14/2026
Polaris Venture Partners VI (AIV), L.P.
Signature:
/s/ Lauren Crockett
Name/Title:
Lauren Crockett/ Authorized Signatory of Polaris Venture Management Co. VI, L.L.C., general partner of Polaris Venture Partners VI (AIV), L.P.
Date:
05/14/2026
Polaris Venture Partners VI (AIV-B), L.P.
Signature:
/s/ Lauren Crockett
Name/Title:
Lauren Crockett/ Authorized Signatory of Polaris Venture Management Co. VI, L.L.C., general partner of Polaris Venture Partners VI (AIV-B), L.P.
Date:
05/14/2026
Polaris Venture Management Co VI, L.L.C.
Signature:
/s/ Lauren Crockett
Name/Title:
Lauren Crockett/ Authorized Signatory*
Date:
05/14/2026
David Barrett
Signature:
/s/ Lauren Crockett
Name/Title:
Lauren Crockett/ Attorney-In-Fact
Date:
05/14/2026
Brian Chee
Signature:
/s/ Lauren Crockett
Name/Title:
Lauren Crockett/ Attorney-In-Fact
Date:
05/14/2026
Jonathan A. Flint
Signature:
/s/ Lauren Crockett
Name/Title:
Lauren Crockett/ Attorney-In-Fact
Date:
05/14/2026
Terrance G. McGuire
Signature:
/s/ Lauren Crockett
Name/Title:
Lauren Crockett/ Attorney-In-Fact
Date:
05/14/2026
Amir Nashat
Signature:
/s/ Lauren Crockett
Name/Title:
Lauren Crockett/ Attorney-In-Fact
Date:
05/14/2026
Bryce Youngren
Signature:
/s/ Lauren Crockett
Name/Title:
Lauren Crockett/ Attorney-In-Fact
Date:
05/14/2026
Comments accompanying signature:
This Schedule 13G was executed pursuant to a Power of Attorney. Note that copies of the applicable Power of Attorney are already on file with the appropriate agencies.
What does Alector's Schedule 13G/A Amendment No. 7 disclose for ALEC?
It updates beneficial ownership figures for Polaris entities and named individuals as of April 30, 2026. The filing lists entity and individual share counts and bases percentage calculations on 110,362,581 shares outstanding as of February 20, 2026.
How many shares does Polaris Venture Management Co. VI, L.L.C. report influence over for ALEC?
Polaris Venture Management Co. VI, L.L.C. reports shared voting and dispositive power over 4,853,817 shares, equal to 4.4% based on the disclosed outstanding share count of 110,362,581.
What holdings are reported for PVP VI (AIV) in the amendment for ALEC?
The amendment reports that PVP VI (AIV) holds 3,280,842 shares, representing 3.0% of the common stock using the issuer's stated outstanding share figure of 110,362,581.
Why does Terrance G. McGuire have a different outstanding-share basis in his footnote?
Mr. McGuire's footnote adds 26,250 restricted stock units to the issuer's stated outstanding shares, yielding a cited basis of 110,388,831 when calculating his percentage; this adjustment is disclosed within his row.
Do these filings indicate Polaris or named individuals sold or bought ALEC shares?
No. The amendment reports beneficial ownership levels and voting/dispositive power; it does not report purchases or sales. It amends prior Schedule 13G/A disclosure as of April 30, 2026.
