Company · Ownership research

Alector, Inc. ALEC

CIK 0001653087

Form 4 transactions dated Sep 1, 2023 to Sep 27, 2026, as reported to the SEC.

Insider trading Initial holdings Institutional holders

Insider filings on file run through 2026-09-04.

Insider purchases & sales

Purchased: $0.00
Sold: $9.31M

Sep 1, 2023 – Sep 4, 2026
Available records · partial months are marked ·

202510 of 18 preview events

Date	Insider	Activity	Trade value (USD)	% of prior holding
2025-12-05	Wong-Sarad Grace Principal Accounting Officer	Sale10b5-1 footnote	$5.75K 4,753 shares sold	3.72% sold Direct holding	▾
2025-12-03	Berkley Neil Lindsay Chief Bus Ofcr & Interim CFO	Sale	$41.72K 37,261 shares sold	9.05% sold Direct holding	▾
2025-12-03	Wong-Sarad Grace Principal Accounting Officer	Sale	$9.02K 8,056 shares sold	5.93% sold Direct holding	▾
2025-12-03	Kenkare-Mitra Sara President and Head of R&D	Sale	$46.67K 41,687 shares sold	7.67% sold Direct holding	▾
2025-12-03	Rosenthal Arnon Chief Executive Officer · Director	Sale	$116.83K 104,347 shares sold	4.13% sold Direct holding	▾
2025-09-02	Wong-Sarad Grace Principal Accounting Officer	Sale	$14.76K 5,910 shares sold	5.40% sold Direct holding	▾
2025-09-02	Berkley Neil Lindsay Principal Financial Officer	Sale	$39.55K 15,842 shares sold	4.37% sold Direct holding	▾
2025-09-02	Kenkare-Mitra Sara President and Head of R&D	Sale	$59.02K 23,638 shares sold	4.17% sold Direct holding	▾
2025-09-02	Rosenthal Arnon Chief Executive Officer · Director	Sale	$128.74K 51,562 shares sold	2.15% sold Direct holding	▾
2025-08-26	Hammond Paula Director	Sale10b5-1 footnote	$33.00K 14,000 shares sold	15.75% sold Direct holding	▾

Showing 18 / 18 record groups in 2025. The complete set is available through the API.

Alector, Inc. · ALEC

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The initial HTML of this page carries its exact data as script#research-data (JSON): values, units, scope, preview limits and SEC sources. Read it directly, no script or API key needed; script#research-access says what needs an account. For the year shown, this page lists 18 of 18 purchase / sale groups and 26 of 26 other groups; the totals and the monthly series cover the whole window.

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{"ticker":"ALEC","transaction_code":["P","S"],"transaction_form_type":"4","page_size":20}

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Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.

Non-cancelled, non-derivative purchase (P) and sale (S) rows dated inside the public window, as reported. Includes open-market and private transactions. Data after the latest filing is not asserted complete and is not zero-filled. A grouped event shares filing, transaction date, security, code, direction, ownership bucket and source. Derivative groups also match underlying security, exercise price, exercise/expiration dates and footnote references. Reported rows are retained; P/S price lots can be grouped. Post-transaction balances are never summed.