Rosenthal Arnon - Insider Non-Derivative Transactions at Alector, Inc. (ALEC) - (SEC)

Updated on January 3, 2026.

According to recent SEC insider information filed on Dec 3, 2025, Rosenthal Arnon's relationship to Alector, Inc. (ALEC) is Director,Officer (Chief Executive Officer), and currently has 2,420,040 shares of Common Stock.

The chart below shows the number of shares owned, and the table shows the recent insider transactions.

You can see similar information for other ALEC insiders.

Related Topics: SEC Topic List.

Data Source: SEC.

Rosenthal Arnon - Insider Non-Derivative Transactions of ALEC Common Stock

Rosenthal Arnon - Insider Non-Derivative Transactions at ALEC

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Date	Transaction	No. of Shares	Price Per Share	Shares Owned After Transactions
Dec 4, 2025	Sell -- (Common Stock)	104347	1.12	2420040
Nov 11, 2025	Acquisition -- (Common Stock)	174167	0	2524387
Sep 3, 2025	Sell -- (Common Stock)	51562	2.5	2350220
Jul 2, 2025	Acquisition -- (Common Stock)	137125	0	2551782
Jun 3, 2025	Sell -- (Common Stock)	52087	1.34	2414657
Mar 4, 2025	Sell -- (Common Stock)	40330	1.47	2466744
Dec 3, 2024	Sell -- (Common Stock)	52172	2.52	2507074
Oct 2, 2024	Acquisition -- (Common Stock)	610500	0	2559246
Sep 4, 2024	Sell -- (Common Stock)	26499	4.88	1948746
Jun 4, 2024	Sell -- (Common Stock)	25135	4.8	1975245
Mar 5, 2024	Sell -- (Common Stock)	18837	6.92	2000380
Dec 5, 2023	Sell -- (Common Stock)	23831	5.56	2019217
Oct 2, 2023	Acquisition -- (Common Stock)	397600	0	2043048
Sep 6, 2023	Sell -- (Common Stock)	5647	5.19	1645448
Jun 3, 2023	Sell -- (Common Stock)	5255	6.9	1651095
Mar 18, 2023	Sell -- (Common Stock)	15186	6.22	1656350
Mar 4, 2023	Acquisition -- (Common Stock)	42990	0	1671536
Mar 3, 2023	Sell -- (Common Stock)	5849	8.32	1628546