Alector director granted RSUs and options

DESOUZA ERROL B reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

DESOUZA ERROL B reported acquisition or exercise transactions in this Form 4 filing.

Alector, Inc. director Errol B. DeSouza received equity compensation consisting of restricted stock units and stock options. He was granted 28,700 RSUs representing common stock, bringing his direct common stock holdings to 98,650 shares after the award.

The RSUs vest on the earlier of June 16, 2027 or Alector’s next annual stockholder meeting. DeSouza was also granted options over 9,450 shares of common stock, which vest in 12 equal monthly installments beginning July 17, 2026, and fully vest on the earlier of the one-year anniversary of grant or the next annual meeting, and expire on June 16, 2036.

Insider Trade Summary

Grant/Award: 38,150 shares

Grant/Award 2 txns

Insider DESOUZA ERROL B

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Stock Option (right to buy)	9,450	$0.00	$0.00
Grant/Award	Common Stock	28,700	$0.00	$0.00

Holdings After Transaction: Stock Option (right to buy) — 9,450 contracts (Direct); Common Stock — 98,650 shares (Direct)

Footnotes (2)

1. F1. The reported shares are represented by restricted stock units, or RSUs, which vest on the earlier of (i) June 16, 2027 or (ii) the date of the Issuer's next annual meeting of stockholders.
2. F2. The shares subject to the option vest in 12 equal monthly installments beginning on July 17, 2026, provided that the shares subject to the option will vest in full on the earlier of the one-year anniversary of the date of grant or the date of the Issuer's next annual meeting of stockholders.

Key Figures

RSU grant: 28,700 shares Common shares after grant: 98,650 shares Stock options granted: 9,450 options +4 more

7 metrics

RSU grant 28,700 shares Restricted stock units representing common stock granted to director

Common shares after grant 98,650 shares Direct common stock holdings following RSU award

Stock options granted 9,450 options Options over common stock granted to director

Option exercise price $0.00 per share Conversion or exercise price for the new stock options

Option expiration June 16, 2036 Expiration date of the granted stock options

RSU vesting date June 16, 2027 RSUs vest on this date or earlier if next annual meeting occurs

Option vesting start July 17, 2026 Monthly vesting of options begins on this date

Key Terms

restricted stock units, RSUs, Stock Option (right to buy), annual meeting of stockholders, +1 more

5 terms

restricted stock units financial

"The reported shares are represented by restricted stock units, or RSUs, which vest on the earlier of (i) June 16, 2027 or (ii) the date of the Issuer's next annual meeting of stockholders."

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.

RSUs financial

"The reported shares are represented by restricted stock units, or RSUs, which vest on the earlier of (i) June 16, 2027 or (ii) the date of the Issuer's next annual meeting of stockholders."

RSUs, or restricted stock units, are a form of company shares given to employees as part of their compensation. They are typically awarded with certain restrictions, such as a waiting period before they can be fully owned or sold, similar to earning a gift that becomes fully yours over time. For investors, RSUs can impact a company's stock offerings and reflect how much the company relies on stock-based incentives to attract and retain talent.

Stock Option (right to buy) financial

"Stock Option (right to buy) listed as a derivative security with underlying Common Stock."

annual meeting of stockholders financial

"…or (ii) the date of the Issuer's next annual meeting of stockholders."

vesting financial

"The shares subject to the option vest in 12 equal monthly installments beginning on July 17, 2026…"

Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.

FAQ

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

What did Alector (ALEC) director Errol B. DeSouza receive in this Form 4?

Errol B. DeSouza received equity compensation awards, including 28,700 restricted stock units and stock options over 9,450 shares. These awards increase his direct equity stake in Alector and are structured to vest over time based on continued service.

How many Alector (ALEC) shares does Errol B. DeSouza hold after the awards?

After the grant, Errol B. DeSouza directly holds 98,650 shares of Alector common stock. This figure includes the newly granted 28,700 restricted stock units, which will settle into shares as they vest according to the specified vesting schedule.

When do Errol B. DeSouza’s new Alector (ALEC) RSUs vest?

The 28,700 restricted stock units vest on the earlier of June 16, 2027, or the date of Alector’s next annual meeting of stockholders. This time-based vesting design aligns the director’s compensation with ongoing board service over the coming period.

What are the key terms of the new Alector (ALEC) stock options granted?

The stock options cover 9,450 shares of Alector common stock and were granted at an exercise price of $0.00 per share. They vest in 12 equal monthly installments starting July 17, 2026, and fully vest by the earlier of one year after grant or the next annual meeting.

When do Errol B. DeSouza’s new Alector (ALEC) options expire?

The options granted to Errol B. DeSouza expire on June 16, 2036. If not exercised by that date, they will lapse. The long-dated expiration provides a substantial window for potential future exercise, subject to vesting and other plan conditions.

Is this Alector (ALEC) Form 4 a purchase or a compensation grant?

This Form 4 reflects compensation grants, not open-market purchases. The transactions use code “A” for grant or award, indicating restricted stock units and stock options were awarded to the director as part of his equity-based compensation package.

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

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Accepted by SEC EDGAR 06/17/2026 - 04:05 PM Learn about SEC filing dates

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^*

DESOUZA ERROL B

(Last) (First) (Middle)

C/O ALECTOR, INC.

131 OYSTER POINT BLVD., SUITE 600

(Street)

SOUTH SAN FRANCISCO CALIFORNIA 94080

(City) (State) (Zip)

UNITED STATES

(Country)

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
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/17/2026

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

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

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

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	06/17/2026		A		28,700(1)	A	$0.00	98,650	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
Stock Option (right to buy)	$0	06/17/2026		A		9,450		(2)	06/16/2036	Common Stock	9,450	$0.00	9,450	D

Explanation of Responses:

1. The reported shares are represented by restricted stock units, or RSUs, which vest on the earlier of (i) June 16, 2027 or (ii) the date of the Issuer's next annual meeting of stockholders.

2. The shares subject to the option vest in 12 equal monthly installments beginning on July 17, 2026, provided that the shares subject to the option will vest in full on the earlier of the one-year anniversary of the date of grant or the date of the Issuer's next annual meeting of stockholders.

	/s/ Grace Wong-Sarad, by power of attorney	06/17/2026
	** 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.
* Form 4: SEC 1474 (03-26)