Alector director receives new stock and option awards

Altmeyer Mark reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Altmeyer Mark reported acquisition or exercise transactions in this Form 4 filing.

Alector, Inc. director Mark Altmeyer reported equity awards consisting of restricted stock units and stock options. He received 28,700 RSUs representing shares of common stock, which vest on the earlier of June 17, 2027 or the company’s next annual stockholder meeting. He was also granted options for 9,450 shares of common stock, vesting in 12 equal monthly installments beginning July 17, 2026, or in full on the earlier of one year from grant or the next annual meeting. Following these awards, he directly holds 98,650 shares of common stock and 9,450 stock options.

Insider Trade Summary

Grant/Award: 38,150 shares

Grant/Award 2 txns

Insider Altmeyer Mark

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 17, 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 Option grant: 9,450 options Shares held after awards: 98,650 shares +4 more

7 metrics

RSU grant 28,700 shares Restricted stock units vesting by June 17, 2027 or next annual meeting

Option grant 9,450 options Stock options on common stock granted as of June 17, 2026

Shares held after awards 98,650 shares Common stock directly owned following the RSU grant

Options held after awards 9,450 options Total stock options following the new grant

RSU vesting date June 17, 2027 Latest vesting date, or earlier at next annual meeting

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

Option expiration June 16, 2036 Expiration date for the stock options

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 June 17, 2027 or the next annual meeting."

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 June 17, 2027 or the next annual meeting."

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

"RSUs and options vest on the earlier of specified dates or the Issuer's next annual meeting of stockholders."

vesting financial

"The RSUs and options vest over time, including monthly installments and full vesting tied to future dates or meetings."

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 insider transactions did Alector (ALEC) director Mark Altmeyer report?

Mark Altmeyer reported receiving equity awards in Alector common stock. He acquired 28,700 restricted stock units and stock options for 9,450 shares, both granted at no cash cost as compensation-related awards rather than open-market purchases.

How many Alector (ALEC) shares does Mark Altmeyer hold after this Form 4?

After these awards, Mark Altmeyer directly holds 98,650 shares of Alector common stock. In addition, he holds stock options covering 9,450 underlying shares, providing potential future ownership if the options are exercised under their terms.

When do Mark Altmeyer’s new Alector (ALEC) RSUs vest?

The 28,700 restricted stock units vest on the earlier of June 17, 2027 or the date of Alector’s next annual meeting of stockholders. Vesting means the RSUs convert into common shares that the director can own outright, subject to plan terms.

What are the vesting terms for Mark Altmeyer’s Alector (ALEC) stock options?

The options on 9,450 Alector shares vest in 12 equal monthly installments beginning July 17, 2026. They will vest in full sooner if reached by the one-year anniversary of grant or the date of Alector’s next annual stockholder meeting.

Are Mark Altmeyer’s Alector (ALEC) transactions open-market buys or equity awards?

These transactions are classified as awards, not open-market purchases. The Form 4 uses transaction code “A” for grant or award, and the reported price per share is zero, indicating compensation-related equity grants rather than cash share purchases.

What type of securities did Alector (ALEC) grant to director Mark Altmeyer?

Alector granted two types of securities: 28,700 restricted stock units representing common shares, and options to purchase 9,450 shares of common stock. Both are equity-based compensation instruments designed to align the director’s interests with shareholders.

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^*

Altmeyer Mark

(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 17, 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)