Company · Ownership research

Accelerant Holdings ARX

CIK 0001997350

Form 4 transactions dated Oct 1, 2023 to Oct 16, 2026, as reported to the SEC.

Insider trading Initial holdings Institutional holders

Insider filings on file run through Aug 25, 2026.

Insider purchases & sales

Purchased: $1.90M
Sold: $265.09M

Oct 1, 2023 – Aug 25, 2026
Available records · partial months are marked ·

202610 of 24 preview events

Date	Insider	Activity	Trade value (USD)	% of prior holding
Aug 21, 2026	Meriwether Karen Sue Director	Sale	$10.63K 542 shares sold	2.53% sold Direct holding	▾
Aug 13, 2026	Hasley Nancy Director	Sale10b5-1 footnote	$400.84K 20,489 shares sold	1.50% sold Direct holding	▾
Aug 11, 2026	ONeill Francis James Co-Founder, Chief U/W Officer	Sale10b5-1 footnote	$1.11M 89,219 shares sold	1.38% sold Indirect holding	▾
Aug 10, 2026	ONeill Francis James Co-Founder, Chief U/W Officer	Sale10b5-1 footnote	$767.67K 63,616 shares sold	0.98% sold Indirect holding	▾
Aug 10, 2026	RADKE JEFFREY L Co-Founder, CEO · Director · 10% owner	Sale10b5-1 footnote	$967.10K 80,000 shares sold	0.29% sold LLC holding	▾
Aug 3, 2026	RADKE JEFFREY L Co-Founder, CEO · Director · 10% owner	Sale10b5-1 footnote	$964.53K 80,000 shares sold	0.29% sold LLC holding	▾
Jul 28, 2026	ONeill Francis James Co-Founder, Chief U/W Officer	Sale10b5-1 footnote	$1.52M 104,647 shares sold	1.58% sold Indirect holding	▾
Jul 27, 2026	ONeill Francis James Co-Founder, Chief U/W Officer	Sale10b5-1 footnote	$1.62M 110,467 shares sold	1.64% sold Indirect holding	▾
Jul 27, 2026	RADKE JEFFREY L Co-Founder, CEO · Director · 10% owner	Sale10b5-1 footnote	$1.39M 95,223 shares sold	0.34% sold LLC holding	▾
Jul 27, 2026	Sternberg Matthew David COO, Risk Exchange	Sale10b5-1 footnote	$257.21K 17,568 shares sold	2.86% sold Direct holding	▾

Showing 24 / 24 record groups in 2026. The complete set is available through the API.

Accelerant Holdings · ARX

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{"ticker":"ARX","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. 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.