Alector accounting chief sells 9,446 shares

Alector’s principal accounting officer reported 9,446 ALEC shares sold under a pre-set Rule 10b5-1 trading plan over three days in early September 2026.

Rhea-AI Filing Summary

Alector, Inc. (ALEC) reported that Principal Accounting Officer Grace Wong-Sarad sold a total of 9,446 shares of common stock in three open-market transactions on September 2–4, 2026. All reported sales were effected under a Rule 10b5-1 Trading Plan adopted on September 5, 2025, with one sale on September 3 disclosed as satisfying tax obligations related to vesting RSUs.

Insider Trade Summary

Net Seller: 9,446 shares

Net Sell 3 txns

Insider Wong-Sarad Grace

Role Principal Accounting Officer

Sold 9,446 shs ($25K)

Type	Security	Shares	Price	Value
Sale	Common Stock F1, F4	3,625	$2.5088	$9K
Sale	Common Stock F2, F3	5,165	$2.6655	$14K
Sale	Common Stock F1	656	$2.75	$2K

Holdings After Transaction: Common Stock — 106,015 shares (Direct)

Footnotes (4)

1. F1. The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 Trading Plan adopted by the reporting person on September 5, 2025.
2. F2. The reported shares were sold to satisfy the reporting person's tax obligations in connection with the vesting of restricted stock units, or RSUs.
3. F3. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $2.49 to $2.75. 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.
4. F4. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $2.495 to $2.52. 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.

Key Figures

Total shares sold: 9,446 shares Shares sold on September 2, 2026: 656 shares Shares sold on September 3, 2026: 5,165 shares +4 more

7 metrics

Total shares sold 9,446 shares Common stock sold by Grace Wong-Sarad on September 2–4, 2026

Shares sold on September 2, 2026 656 shares Open-market sale of Alector common stock

Shares sold on September 3, 2026 5,165 shares Open-market sale to satisfy tax obligations related to RSU vesting

Shares sold on September 4, 2026 3,625 shares Open-market sale under Rule 10b5-1 plan

Weighted average price September 2 $2.75 per share Sale of 656 Alector common shares

Weighted average price September 3 $2.6655 per share Sale of 5,165 Alector common shares; trades ranged $2.49–$2.75

Weighted average price September 4 $2.5088 per share Sale of 3,625 Alector common shares; trades ranged $2.495–$2.52

Key Terms

Rule 10b5-1 Trading Plan, restricted stock units, weighted average price

3 terms

Rule 10b5-1 Trading Plan regulatory

"sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 Trading Plan"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

restricted stock units financial

"sold to satisfy the reporting person's tax obligations in connection with the vesting of restricted stock units"

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.

weighted average price financial

"The price reported in Column 4 is a weighted average price"

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

FAQ

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

What insider transactions did Alector (ALEC) disclose in this Form 4?

The filing reports that Principal Accounting Officer Grace Wong-Sarad sold 9,446 shares of Alector common stock in three open-market transactions on September 2, 3, and 4, 2026.

At what prices were the ALEC shares sold in the reported transactions?

The reported weighted average prices were $2.75 on September 2, $2.6655 on September 3, and $2.5088 on September 4. Footnotes state the September 3 sales occurred between $2.49 and $2.75 and the September 4 sales between $2.495 and $2.52.

How many ALEC shares did the Alector officer sell on each date?

Grace Wong-Sarad sold 656 shares on September 2, 5,165 shares on September 3, and 3,625 shares on September 4, 2026, for a total of 9,446 shares of Alector common stock.

Were the Alector (ALEC) insider sales made under a Rule 10b5-1 trading plan?

Yes. A footnote states that the sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 Trading Plan adopted by the reporting person on September 5, 2025.

Why were some of the ALEC shares sold by the Alector officer?

A footnote explains that the shares sold on September 3, 2026 were sold to satisfy tax obligations arising from the vesting of restricted stock units (RSUs) held by the reporting person.

Does the Form 4 state how many ALEC shares the insider holds after these sales?

No. The non-derivative transaction rows report the sales but do not state the total shares held following the transactions, so the post-transaction ownership position is not provided here.

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

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Available on EDGAR 09/04/2026 - 05:45 PM EDT Accepted by SEC EDGAR 09/04/2026 - 05:45 PM EDT 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^*

Wong-Sarad Grace

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/02/2026

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	09/02/2026		S(1)		656	D	$2.75	114,805	D
Common Stock	09/03/2026		S(2)		5,165	D	$2.6655(3)	109,640	D
Common Stock	09/04/2026		S		3,625(1)	D	$2.5088(4)	106,015	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 sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 Trading Plan adopted by the reporting person on September 5, 2025.

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

3. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $2.49 to $2.75. 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.

4. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $2.495 to $2.52. 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.

	/s/Grace Wong-Sarad	09/04/2026
	** 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)