ALEC Form 144: Insider sale of 37,261 shares

Alector, Inc. reported insider transaction activity via Form 144 relating to Common Stock.

Rhea-AI Filing Summary

Alector, Inc. reported insider transaction activity via Form 144 relating to Common Stock. The filing lists 37,261 shares sold by Neil Berkley on 12/03/2025. It also records 45,520 restricted stock units vesting on 02/27/2026 and shows 110,374,418 shares (labelled) with a date of 03/02/2026.

Insights

Insider Transactions Compliance

Form 144 lists an individual sale and an RSU vesting event; timing and amounts are explicit.

The filing records a reported sale of 37,261 shares by Neil Berkley on 12/03/2025, which is a historical disposition requiring notification under resale rules. The excerpt also shows 45,520 restricted stock units vesting on 02/27/2026.

Cash‑flow treatment and plan mechanics are not shown in the excerpt; subsequent filings or broker confirmations would state whether shares were sold into the market or withheld for taxes. Review future SEC submissions for disposition details and any broker-dealer execution information.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does Alector's (ALEC) Form 144 report?

It reports an insider sale and RSU vesting. The filing lists a 37,261 share sale by Neil Berkley on 12/03/2025 and 45,520 RSUs vesting on 02/27/2026.

How many shares did Neil Berkley sell according to ALEC Form 144?

The filing shows 37,261 shares sold. That disposition is dated 12/03/2025 and is recorded in the "Securities Sold During The Past 3 Months" section of the excerpt.

Does the Form 144 show RSUs vesting for ALEC insiders?

Yes — 45,520 RSUs are listed as vesting. The excerpt records those restricted stock units with a vesting date of 02/27/2026 under "Securities To Be Sold."

What outstanding share figure appears in the excerpt for ALEC?

The excerpt includes a figure of 110,374,418 shares. That number is shown alongside a date of 03/02/2026 in the filing information section.

Who is the broker-dealer named in the ALEC Form 144 excerpt?

Morgan Stanley Smith Barney LLC is listed. The broker-dealer address appears as "1 New York Plaza 8th Floor New York NY 10004" in the securities information section of the excerpt.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 02/27/2026 - 06:10 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0002075298
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	Alector, Inc.
SEC File Number	001-38792
Address of Issuer	131 Oyster Point Blvd. Suite 600 South San Francisco CALIFORNIA 94080
Phone	(415)-231-5660
Name of Person for Whose Account the Securities are To Be Sold	Neil L. Berkley
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common Stock	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	23161	56281.23	110374418	03/02/2026	Nasdaq

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common Stock	02/27/2026	Vesting of Restricted Stock Units	Issuer			45520	02/27/2026	(1)

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Neil Berkley C/O Alector, Inc. 131 Oyster Point Blvd., Suite 600 South San Francisco CA 94080	Common Stock	12/03/2025	37261	41717.42

144: Remarks and Signature

Remarks	(1) The securities to be sold were received upon the settlement of vested restricted stock units, or RSUs. The reported shares will be sold to satisfy the reporting person's tax obligations in connection with the vesting of RSUs.
Date of Notice	02/27/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Grace Wong-Sarad, by power of attorney
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)