[Form 3] Alector, Inc. Initial Statement of Beneficial Ownership

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Berkley Neil Lindsay

Role Principal Financial Officer

Type	Security	Shares	Price	Value
holding	Employee Stock Option (right to buy)	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Employee Stock Option (right to buy) — 12,975 shares (Direct); Common Stock — 362,412 shares (Direct)

Footnotes (1)

1. Of the reported shares, 295,639 are represented by restricted stock units, or RSUs, which vest as follows: (i) 133,334 RSUs vest in eight equal quarterly installments beginning on September 1, 2025; (ii) 123,405 RSUs vest in nine equal quarterly installments beginning on September 1, 2025; and (iii) 38,900 RSUs vest as to three-fourths (3/4ths) on December 1, 2025 and as to the remainder on March 1, 2026. One-half (1/2) of the total shares subject to the option vest on November 1, 2025, and one-twelfth (1/12th) of the total shares shall vest monthly beginning on December 1, 2025.

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SEC Form 3

FORM 3

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

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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:			3235-0104
Estimated average burden
hours per response:			0.5

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. Date of Event Requiring Statement (Month/Day/Year)
06/20/2025

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

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

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

5. 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 Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	362,412(1)	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Employee Stock Option (right to buy)	(2)	05/15/2035	Common Stock	12,975	$1.105	D

Explanation of Responses:

1. Of the reported shares, 295,639 are represented by restricted stock units, or RSUs, which vest as follows: (i) 133,334 RSUs vest in eight equal quarterly installments beginning on September 1, 2025; (ii) 123,405 RSUs vest in nine equal quarterly installments beginning on September 1, 2025; and (iii) 38,900 RSUs vest as to three-fourths (3/4ths) on December 1, 2025 and as to the remainder on March 1, 2026.

2. One-half (1/2) of the total shares subject to the option vest on November 1, 2025, and one-twelfth (1/12th) of the total shares shall vest monthly beginning on December 1, 2025.

	/s/ Grace Wong-Sarad, by power of attorney	06/30/2025
	** 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 5 (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.