[144] Alector, Inc. SEC Filing

Rhea-AI Filing Summary

Alector, Inc. insider sale notice: The filing reports that 50,242 shares of Alector common stock will be offered for sale via Morgan Stanley Smith Barney, with an aggregate market value of $118,068.70 and an approximate sale date of 09/02/2025. The shares were acquired on 08/29/2025 upon vesting of restricted stock units totaling 98,939 shares; payment was recorded on the same date. The company has 101,212,329 shares outstanding, so the planned sale represents about 0.05% of outstanding shares. The filer also reported a prior sale on 06/02/2025 of 52,087 shares for $69,713.24. The notice includes the required representation that the seller is not aware of undisclosed material adverse information.

Positive

• Timely disclosure of proposed sale under Rule 144, including broker details and acquisition method
• Use of a registered broker (Morgan Stanley Smith Barney) for execution, indicating standard market procedure

Negative

• Insider selling activity with a recent prior sale (52,087 shares on 06/02/2025) which may warrant monitoring for trends
• Form does not state whether the sales are part of a 10b5-1 trading plan (no plan adoption date provided)

Insights

Securities Analyst

TL;DR: Routine post-vesting insider sale disclosed; small relative size and prior recent sale suggest limited market impact.

The filing documents a scheduled sale of 50,242 shares following vesting of 98,939 restricted stock units on 08/29/2025. At an aggregate value of $118,068.70 against 101.2 million shares outstanding, the transaction is immaterial to market capitalization. The use of a major broker for execution and formal Rule 144 notice indicate compliance with resale requirements. Recent disposition of 52,087 shares on 06/02/2025 is disclosed, which is relevant for monitoring insider selling patterns but does not by itself indicate material corporate change.

Corporate Governance Expert

TL;DR: Proper procedural disclosure under Rule 144; governance implication is routine but should be tracked for insider activity trends.

The signer attests no undisclosed material adverse information is known and the form lists broker execution details and acquisition method (RSU vesting). This is consistent with compliant insider reporting. While multiple recent sales are disclosed, each transaction is small relative to total shares outstanding. Governance focus should be on whether these sales follow a documented trading plan, though the form does not indicate a 10b5-1 plan adoption date.

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

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	50242	118068.70	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			98939	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
Arnon Rosenthal C/O Alector, Inc. 131 Oyster Point Blvd., Suite 600 South San Francisco CA 94080	Common Stock	06/02/2025	52087	69713.24

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 Alector (ALEC) Form 144 report?

The form reports a proposed sale of 50,242 shares of Alector common stock valued at $118,068.70, with an approximate sale date of 09/02/2025.

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

The shares were acquired on 08/29/2025 through vesting of restricted stock units; the total number of RSU shares vested was 98,939.

Did the filer sell any Alector shares recently?

Yes. The filer sold 52,087 shares on 06/02/2025 for gross proceeds of $69,713.24.

What proportion of Alector's shares does the proposed sale represent?

The proposed sale of 50,242 shares represents about 0.05% of the reported 101,212,329 shares outstanding.

Does the Form 144 indicate the seller has undisclosed material information?

No. The filer attests by signature that they do not know of any material adverse information about the issuer that has not been publicly disclosed.