Alector files Form 144 to sell 132,805 RSU shares

Alector, Inc. filed a Form 144 notifying the proposed sale of 132,805 shares of Common Stock tied to the vesting of restricted stock units on 06/01/2026.

Rhea-AI Filing Summary

Alector, Inc. filed a Form 144 notifying the proposed sale of 132,805 shares of Common Stock tied to the vesting of restricted stock units on 06/01/2026. The notice also records prior dispositions of 81,864 shares on 03/02/2026 producing $173,825.38 in proceeds. The transactions are reported in connection with brokerage arrangements through Morgan Stanley Smith Barney and list Nasdaq as the market.

Insights

Securities Counsel

Form 144 filed for RSU-related sale; prior sales disclosed.

The filing states a proposed sale of 132,805 shares associated with the vesting of restricted stock units on 06/01/2026. It also discloses prior sales of 81,864 shares on 03/02/2026 generating $173,825.38.

These notices are routine regulatory filings to report anticipated and recent dispositions. Cash‑flow treatment and any broker distribution method are not detailed in the excerpt; subsequent filings or broker confirmations may show execution specifics.

Key Figures

Proposed shares to be sold: 132,805 shares Shares sold in past 3 months: 81,864 shares Proceeds from prior sales: $173,825.38 +2 more

5 metrics

Proposed shares to be sold 132,805 shares Securities To Be Sold; Vesting of Restricted Stock Units; 06/01/2026

Shares sold in past 3 months 81,864 shares Securities Sold During The Past 3 Months; 03/02/2026

Proceeds from prior sales $173,825.38 Proceeds tied to 03/02/2026 dispositions

Vesting / sale date 06/01/2026 Vesting of Restricted Stock Units; proposed sale date

Prior sale date 03/02/2026 Date of securities sold during the past 3 months

Key Terms

Restricted Stock Units, Form 144, Proceeds

3 terms

Restricted Stock Units financial

"Vesting of Restricted Stock Units | Issuer | 132805 | 06/01/2026"

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.

Form 144 regulatory

"144: Securities To Be Sold | Securities Sold During The Past 3 Months"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

Proceeds financial

"03/02/2026 | 81864 | 173825.38"

FAQ

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

What did Alector (ALEC) report on Form 144?

Alector reported a proposed sale of 132,805 shares tied to RSU vesting on 06/01/2026. The filing also lists prior dispositions of 81,864 shares on 03/02/2026 producing $173,825.38.

Does the Form 144 show when the restricted stock units vested?

Yes. The document links the proposed sale to the vesting event on 06/01/2026. The filing explicitly pairs the 132,805 shares with that vesting date in the excerpt.

How many shares were sold in the prior three months?

The filing records sales of 81,864 shares on 03/02/2026. The excerpt also lists proceeds from those sales as $173,825.38 in the same row.

Which broker and market are referenced in the filing?

The notice lists Morgan Stanley Smith Barney LLC as the broker and identifies Nasdaq as the market. Those exact names appear in the securities information section of the excerpt.

Does the Form 144 state cash‑flow recipients or use of proceeds?

The excerpt does not state who receives the proceeds or how they will be used. The filing rows show proceeds figures but do not attach a payee or use‑of‑proceeds statement.

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

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Accepted by SEC EDGAR 06/01/2026 - 07:00 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	0001757770
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	Arnon Rosenthal
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
Relationship to Issuer	Director

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	67572	139874.04	111026437	06/02/2026	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	06/01/2026	Vesting of Restricted Stock Units	Issuer			132805	06/01/2026	(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
Arnon Rosenthal C/O Alector, Inc. 131 Oyster Point Blvd., Suite 600 South San Francisco CA 94080	Common Stock	03/02/2026	81864	173825.38

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	06/01/2026
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)