Alector, Inc. Insider Trading Activity

Accepted by SEC EDGAR 07/01/2025 - 05:00 PM EDT Learn about SEC filing dates

Insider Trade Summary

Grant/Award: 182,825 shares

Grant/Award 2 txns

Insider Rosenthal Arnon

Role Chief Executive Officer

Type	Security	Shares	Price	Value
Grant/Award	Employee Stock Option (right to buy)	45,700	$0.00	$0.00
Grant/Award	Common Stock	137,125	$0.00	$0.00
Holding	Common Stock	--	--	--
Holding	Common Stock	--	--	--
Holding	Common Stock	--	--	--
Holding	Common Stock	--	--	--

Holdings After Transaction: Employee Stock Option (right to buy) — 45,700 options (Direct); Common Stock — 2,551,782 shares (Direct); Common Stock — 3,930,375 shares (Indirect, See footnote)

Footnotes (6)

1. F1. The reported shares are represented by restricted stock units, or RSUs, one half (1/2) of the total shares shall vest on December 1, 2025 and one fourth (1/4th) of the total shares shall vest quarterly thereafter.
2. F2. The reported securities are held directly by The Rosenthal Family Revocable Trust Dated November 4, 1994, as restated on June 9, 1999, for which the Reporting Person serves as trustee.
3. F3. The reported securities are held directly by the Adi Rosenthal 2007 Trust dated March 27, 2007, for which the Reporting Person serves as trustee.
4. F4. The reported securities are held directly by the Noam Rosenthal 2007 Trust dated March 27, 2007, for which the Reporting Person serves as trustee.
5. F5. The reported securities are held directly by the Shani Rosenthal 2007 Trust dated March 27, 2007, for which the Reporting Person serves as trustee.
6. F6. One third (1/3rd) of the total shares subject to the option shall vest on November 1, 2025, and one twelfth (1/12th) of the total shares subject to the option shall vest in equal monthly installments thereafter, provided that the shares subject to the option will vest in full on July 1, 2026.

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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
Estimated average burden
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^*

Rosenthal Arnon

(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)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Executive Officer

3. Date of Earliest Transaction (Month/Day/Year)
07/01/2025

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	07/01/2025		A		137,125(1)	A	$0.00	2,551,782	D
Common Stock								1,972,875	I	See footnote(2)
Common Stock								652,500	I	See footnote(3)
Common Stock								652,500	I	See footnote(4)
Common Stock								652,500	I	See footnote(5)

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
Employee Stock Option (right to buy)	$1.42	07/01/2025		A		45,700		(6)	07/01/2035	Common Stock	45,700	$0	45,700	D

Explanation of Responses:

1. The reported shares are represented by restricted stock units, or RSUs, one half (1/2) of the total shares shall vest on December 1, 2025 and one fourth (1/4th) of the total shares shall vest quarterly thereafter.

2. The reported securities are held directly by The Rosenthal Family Revocable Trust Dated November 4, 1994, as restated on June 9, 1999, for which the Reporting Person serves as trustee.

3. The reported securities are held directly by the Adi Rosenthal 2007 Trust dated March 27, 2007, for which the Reporting Person serves as trustee.

4. The reported securities are held directly by the Noam Rosenthal 2007 Trust dated March 27, 2007, for which the Reporting Person serves as trustee.

5. The reported securities are held directly by the Shani Rosenthal 2007 Trust dated March 27, 2007, for which the Reporting Person serves as trustee.

6. One third (1/3rd) of the total shares subject to the option shall vest on November 1, 2025, and one twelfth (1/12th) of the total shares subject to the option shall vest in equal monthly installments thereafter, provided that the shares subject to the option will vest in full on July 1, 2026.

	/s/ Grace Wong-Sarad, by power of attorney	07/01/2025
	** 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.