ALEC insider RSU vesting and proposed 23,019-share sale on Nasdaq

Rhea-AI Filing Summary

Alector, Inc. (ALEC) Form 144 notice shows that 23,019 shares of Common Stock (aggregate market value $54,094.65) are proposed to be sold through Morgan Stanley Smith Barney on 09/02/2025 on Nasdaq. The shares were acquired on 08/29/2025 by vesting of restricted stock units from the issuer, with 45,330 RSU units recorded as acquired that date. The filing also discloses a prior sale by the same person: 23,890 shares sold on 06/02/2025 for $31,974.38. The notice includes the standard representation that the seller is not aware of any undisclosed material adverse information about the issuer.

Positive

• Clear compliance with Rule 144 procedures by identifying broker, sale date, and share quantities
• Disclosure of acquisition details showing shares were acquired via vesting of RSUs on 08/29/2025
• Prior recent sale disclosed (23,890 shares sold on 06/02/2025 for $31,974.38), improving transparency

Negative

• None.

Insights

Securities Analyst

TL;DR: Routine Rule 144 notice for vested RSUs and a small proposed market sale; immaterial to capitalization.

The filing documents a proposed sale of 23,019 shares valued at $54,094.65 and discloses a recent sale of 23,890 shares for $31,974.38. The securities were acquired by vesting of restricted stock units on 08/29/2025. Given the issuer's reported outstanding shares of 101,212,329, the proposed sale represents a de minimis portion of the float and is unlikely to move market valuation. The use of a broker (Morgan Stanley Smith Barney) and the Rule 144 framework indicate the seller is following standard resale procedures.

Corporate Governance Expert

TL;DR: Disclosure aligns with compliance expectations; provides transparency on insider vesting and resale activity.

The form identifies the nature of acquisition as vesting of RSUs and specifies acquisition and payment dates (08/29/2025). It also contains the seller's signed representation about absence of undisclosed material adverse information and references potential trading-plan disclosures. This level of detail meets typical governance and disclosure standards for officer/director/affiliate transfers under Rule 144.

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

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

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

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 Services 200 W Civic Center Dr. 4th Floor Sandy UT 84070	23019	54094.65	101212329	09/02/2025	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	08/29/2025	Vesting of Restricted Stock Units	Issuer			45330	08/29/2025	(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
Sara Kenkare-Mitra C/O Alector, Inc. 131 Oyster Point Blvd., Suite 600 South San Francisco CA 94080	Common Stock	06/02/2025	23890	31974.38

144: Remarks and Signature

Remarks

Date of Notice

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

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What does the Form 144 for Alector (ALEC) disclose about the proposed sale?

The form discloses a proposed sale of 23,019 shares of Common Stock through Morgan Stanley Smith Barney on 09/02/2025 with an aggregate market value of $54,094.65.

How were the shares being sold acquired according to the filing?

The shares were acquired on 08/29/2025 by the vesting of restricted stock units from the issuer; 45,330 units are listed as acquired.

Did the filer disclose any recent sales of the issuer's stock?

Yes. The filing shows Sara Kenkare-Mitra sold 23,890 shares on 06/02/2025 for $31,974.38.

On which exchange and through which broker is the proposed sale to occur?

The proposed sale is to occur on Nasdaq through Morgan Stanley Smith Barney LLC Executive Services.

Does the filing state whether the seller knows of any undisclosed material information?

Yes. By signing the notice the seller represents they do not know any material adverse information