Company · Ownership research

Arcellx, Inc. ACLX

CIK 0001786205

Form 4 transactions dated Nov 1, 2023 to Nov 7, 2026, as reported to the SEC.

Insider trading Initial holdings Institutional holders

This page lists 30 of 34 rows; the complete set is available through the API.

Insider filings on file run through Apr 28, 2026.

Some amendments were merged by Akkru's inferred matching; tick "Confirmed merges only" to exclude these rows.

Insider purchases & sales

Purchased: $0.00
Sold: $130.82M

Nov 1, 2023 – Apr 28, 2026
Available records · partial months are marked ·

202510 of 30 preview events · 34 available in 2025

Date	Insider	Activity	Trade value (USD)	% of prior holding
Nov 17, 2025	Heery Christopher CHIEF MEDICAL OFFICER	Sale10b5-1 footnote	$30.60K 340 shares sold	54.49% sold Direct holding	▾
Oct 15, 2025	Gilson Michelle CHIEF FINANCIAL OFFICER	Sale10b5-1 footnote	$488.32K 5,364 shares sold	38.79% sold Direct holding	▾
Oct 6, 2025	Gilson Michelle CHIEF FINANCIAL OFFICER	Sale10b5-1 footnote	$91.73K 1,064 shares sold	7.14% sold Direct holding	▾
Oct 3, 2025	Gilson Michelle CHIEF FINANCIAL OFFICER	Sale10b5-1 footnote	$419.87K 4,882 shares sold	24.69% sold Direct holding	▾
Sep 30, 2025	Heery Christopher CHIEF MEDICAL OFFICER	Sale10b5-1 footnote	$1.71M 21,034 shares sold	97.12% sold Direct holding	▾
Sep 29, 2025	Heery Christopher CHIEF MEDICAL OFFICER	Sale10b5-1 footnote	$5.85K 73 shares sold	0.34% sold Direct holding	▾
Sep 26, 2025	Heery Christopher CHIEF MEDICAL OFFICER	Sale10b5-1 footnote	$993.16K 12,396 shares sold	36.32% sold Direct holding	▾
Sep 19, 2025	Heery Christopher CHIEF MEDICAL OFFICER	Sale10b5-1 footnote	$24.00K 300 shares sold	0.87% sold Direct holding	▾
Sep 18, 2025	Heery Christopher CHIEF MEDICAL OFFICER	Sale10b5-1 footnote	$267.47K 3,343 shares sold	8.85% sold Direct holding	▾
Jun 10, 2025	Patel Kavita Director	Sale10b5-1 footnote	$101.04K 1,500 shares sold	100.00% sold Direct holding	▾

Showing 30 / 34 record groups in 2025. The complete set is available through the API.

Arcellx, Inc. · ACLX

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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 30 of 34 purchase / sale groups and 30 of 56 other groups; the totals and the monthly series cover the whole window.

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{"action":"list","ticker":"ACLX","transaction_code":["P","S"],"transaction_form_type":"4","page_size":20}

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Sources, coverage & how to read this data

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. Share totals are on today's split-adjusted basis. 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.