Alector files Form 144 for 132,804 RSU shares

Alector, Inc. report of proposed resale and recent dispositions of common stock.

Rhea-AI Filing Summary

Alector, Inc. report of proposed resale and recent dispositions of common stock. The filing lists 132,804 shares tied to the vesting of restricted stock units dated 02/27/2026 that are identified under “Securities To Be Sold.” It also reports 104,347 shares sold on 12/03/2025 as securities sold during the past three months. The entries name a broker and show Nasdaq as the market.

Insights

Equity Compensation Specialist

Filing documents RSU vesting and prior dispositions of common stock.

The record lists 132,804 shares associated with vesting of restricted stock units on 02/27/2026, indicating shares becoming eligible for sale under Form 144 procedures. It separately lists 104,347 shares sold on 12/03/2025.

Timing and sale mechanics are not detailed here; subsequent trading or settlement details would appear in follow‑on filings or broker reports.

Securities Compliance Analyst

Brokerage and market details are provided without proceeds or pricing information.

The excerpt names a broker (Morgan Stanley Smith Barney LLC) and cites Nasdaq as the market, but it does not state sale prices or net proceeds. The action appears procedural under resale rules for shares tied to RSU vesting.

Careful tracking of any later Form 4/Form 5 or trade confirmations is needed to confirm final dispositions.

FAQ

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

What does Alector's Form 144 show about recent insider sales?

It reports 104,347 shares sold on 12/03/2025. The filing lists prior dispositions in the past three months, indicating registered sales occurred through a broker.

How many shares are listed as available to sell after RSU vesting for ALEC?

The filing lists 132,804 shares tied to the vesting of restricted stock units dated 02/27/2026. These are registered under the securities-to-be-sold section.

Which broker and market are named in the ALEC Form 144?

The filing names Morgan Stanley Smith Barney LLC as the broker and identifies Nasdaq as the market for the reported securities.

Does the Form 144 disclose sale prices or proceeds for ALEC transactions?

No; the excerpt lists share counts and dates but does not state sale prices or aggregate proceeds. Pricing and net proceeds are not included in this excerpt.

Are the RSU‑related shares already sold according to the filing?

The entry lists 132,804 shares under “Securities To Be Sold” due to vesting of restricted stock units on 02/27/2026, indicating eligibility for sale but not confirming completed sale transactions.

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	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	67571	164197.53	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			132804	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
Arnon Rosenthal C/O Alector, Inc. 131 Oyster Point Blvd., Suite 600 South San Francisco CA 94080	Common Stock	12/03/2025	104347	116826.90

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)