Alector (NASDAQ: ALEC) insider transactions

In the twelve months to 10 November 2026, executives and directors of Alector reported 21 open-market sales of 553,017 shares ($1.0m) and 0 open-market purchases, by 4 people, according to the Form 4 filings they submitted to the SEC.

Latest transactions

The 20 most recent transactions in Alector shares reported on Form 4
Date	Insider	Role	Transaction	Shares	Price	Held after	Filing
14 October 2026	Wong-Sarad Grace	Principal Accounting Officer	Grant or award	+55,555	—	161,570	Form 4
14 October 2026	Berkley Neil Lindsay	CFO & Chief Business Officer	Grant or award	+44,567	—	395,216	Form 4
14 October 2026	Rosenthal Arnon	Chief Executive Officer	Grant or award	+217,500	—	2,512,100	Form 4
4 September 2026	Wong-Sarad Grace	Principal Accounting Officer	Open-market sale	−3,625	$2.51	106,015	Form 4
3 September 2026	Berkley Neil Lindsay	CFO & Chief Business Officer	Open-market sale	−29,251	$2.66	350,649	Form 4
3 September 2026	Rosenthal Arnon	Chief Executive Officer	Open-market sale	−72,606	$2.66	2,294,600	Form 4
3 September 2026	Wong-Sarad Grace	Principal Accounting Officer	Open-market sale	−5,165	$2.67	109,640	Form 4
2 September 2026	Wong-Sarad Grace	Principal Accounting Officer	Open-market sale	−656	$2.75	114,805	Form 4
19 August 2026	Rosenthal Arnon	Chief Executive Officer	Gift	−1,050,000	—	922,875	Form 4
19 August 2026	Rosenthal Arnon	Chief Executive Officer	Gift	+350,000	—	1,002,500	Form 4
19 August 2026	Rosenthal Arnon	Chief Executive Officer	Gift	+350,000	—	1,002,500	Form 4
19 August 2026	Rosenthal Arnon	Chief Executive Officer	Gift	+350,000	—	1,002,500	Form 4
9 July 2026	Wong-Sarad Grace	Principal Accounting Officer	Grant or award	+20,000	—	115,461	Form 4
17 June 2026	Lavigne Louis J JR	Director	Grant or award	+28,700	—	128,109	Form 4
17 June 2026	Desouza Errol B	Director	Grant or award	+28,700	—	98,650	Form 4
17 June 2026	Altmeyer Mark	Director	Grant or award	+28,700	—	98,650	Form 4
17 June 2026	Scheller Richard H	Director	Grant or award	+28,700	—	134,899	Form 4
17 June 2026	Hammond Paula	Director	Grant or award	+28,700	—	103,609	Form 4
17 June 2026	Garofalo Elizabeth A.	Director	Grant or award	+28,700	—	118,650	Form 4
17 June 2026	Yaffe Kristine	Director	Grant or award	+28,700	—	124,109	Form 4

Names appear as in the filing, surname first. A dash in the price column means the filing reports none, as in grants and gifts.

How to read the table

Only open-market purchases and sales are trades the insider chose to make at the market price, and they are the ones counted in the summary above. Grants, option exercises and shares withheld for tax come from pay plans. A sale marked as a 10b5-1 plan was scheduled in advance under a written plan.

Where each row comes from

From the Form 4 that each executive, director or large shareholder must file with the SEC within two business days of a transaction, read up to 10 November 2026. Each row links to its filing on EDGAR. Only transactions in shares are listed, not derivatives, and amended filings are left out. The accounts of the company are on the Alector page; the method, in data sources.

Information prepared from the Form 4 filings submitted to the SEC, for information purposes only. It is not financial advice or a recommendation to buy or sell. Updated on 12 November 2026.