[Form 4] Alector, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Alector, Inc. (ALEC) director and Principal Financial Officer Neil Lindsay reported a sale of 15,842 shares of common stock on 09/02/2025. The sale was executed at a weighted-average price of $2.4968 per share, with individual trade prices ranging from $2.30 to $2.59. According to the filing, the shares were sold to satisfy tax obligations arising from the vesting of restricted stock units. After the reported transactions, the reporting person beneficially owned 346,570 shares directly. The Form 4 was signed by Grace Wong-Sarad by power of attorney on 09/04/2025.

Positive

• Reporting person retained a significant ownership stake after the sale: 346,570 shares directly beneficially owned.
• Sale was identified as tax-related, implying a routine administrative transaction tied to RSU vesting rather than an opportunistic exit.

Negative

• Insider sold 15,842 shares on 09/02/2025 at a weighted-average price of $2.4968, which slightly reduces insider ownership.
• Multiple sale prices reported ($2.30 to $2.59), indicating the sale occurred in several transactions rather than a single block.

Insights

Securities Analyst

TL;DR: Routine insider sale to cover tax on vested RSUs; not demonstrably dispositive about business prospects.

The Form 4 shows a non-derivative disposition of 15,842 shares at a weighted-average price of $2.4968 to satisfy tax obligations tied to RSU vesting. The seller remains a material holder with 346,570 shares beneficially owned, indicating ongoing exposure to company equity. This transaction is described as a tax-related, rather than opportunistic, sale; therefore it should be interpreted as routine compensation-related liquidity rather than a signal of material change in insider sentiment.

Corporate Governance Expert

TL;DR: Disposition appears administrative (tax withholding) and was executed by POA; governance risk is low based on this filing.

The disclosure explicitly states the sale satisfied tax obligations from RSU vesting, which is a common and accepted practice. The filing was executed through power of attorney, consistent with administrative handling of compensatory equity events. No derivative transactions, loans, or unusual transfer mechanisms are reported. From a governance standpoint, there are no red flags in this Form 4 alone, though monitoring future filings is prudent.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
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hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Berkley Neil Lindsay

(Last) (First) (Middle)

C/O ALECTOR, INC.

131 OYSTER POINT BLVD, SUITE 600

(Street)

SOUTH SAN FRANCISCO CA 94080

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Alector, Inc. [ ALEC ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Principal Financial Officer

3. Date of Earliest Transaction (Month/Day/Year)
09/02/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	09/02/2025		S(1)		15,842	D	$2.4968(2)	346,570	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. The reported shares were sold to satisfy the reporting person's tax obligations in connection with the vesting of restricted stock units, or RSUs.

2. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $2.30 to $2.59. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff, the issuer, or any security holder of the issuer upon request.

	Grace Wong-Sarad, by power of attorney	09/04/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What did Neil Lindsay (ALEC) report on Form 4 dated 09/02/2025?

The filing reports a sale of 15,842 shares of Alector common stock to satisfy tax obligations from RSU vesting.

At what price were the ALEC shares sold in this Form 4?

The weighted-average sale price was $2.4968 per share, with individual trade prices ranging from $2.30 to $2.59.

How many ALEC shares does the reporting person own after the transaction?

The reporting person beneficially owned 346,570 shares following the reported transactions.

Was the sale reported as part of a compensation event or a planned sale?

Yes. The sale was disclosed as satisfying the reporting person's tax obligations in connection with the vesting of restricted stock units.

Who signed the Form 4 on behalf of the reporting person?

The Form 4 was signed by Grace Wong-Sarad by power of attorney on 09/04/2025.