Form 4 for ALEC Alector, Inc.

Accepted 2026-09-04 17:45:06 ET · period of report 2026-09-02 · accession 0001193125-26-383858 · SEC index · Original document

Summary rows

Aggregated the way they appear in lists: one row per insider, transaction code and security table.

X	Filed	Traded	Ticker	Insider	Title	Type	Price	Qty	Owned	ΔOwn	Value
M	2026-09-04 17:45	2026-09-02+	ALEC	Wong-Sarad Grace	Principal Accounting Off	S - Sale	$2.61	-9,446	106.0K	-8%	-$24.7K

Purchase Sale Sale after option exercise All abbreviations

#	Table	Security	Date	Code	A/D	Shares	Price	Owned after	Own	Exercise / expiry	Underlying	Footnotes
1	Common	Common Stock	2026-09-02	S	D	656	$2.75	114,805	D	—	—	(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	Common	Common Stock	2026-09-03	S	D	5,165	$2.67	109,640	D	—	—	(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. (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.
3	Common	Common Stock	2026-09-04	S	D	3,625	$2.51	106,015	D	—	—	(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. (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.