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Public ownership evidence

Accelerant Holdings (ARX) Ownership Disclosures

Read ARX insider transactions, institutional 13F filings and Congressional disclosures with report dates, public availability and original receipts.

As of 2026-11-07T14:03:26.246Z

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2026-08-262026-08-21Meriwether Karen SueS542Not reported

First displayed source row from Recent Form 4 activity. The full bounded history and coverage notes remain below.

The displayed observation date is 2026-08-21 and its public availability date is 2026-08-26. Subtracting those calendar dates gives 5 days of disclosure lag. Historical public research can use the record from the availability date, rather than backdating knowledge to the observation date. The calendar-day difference does not assert an intraday publication time.

This row is code S: a sale. A purchase-following rule excludes this sale even if the reported dollar amount is large.

Open the linked original receipts to verify the row, then inspect a second record before drawing a pattern. This public filing observation supplies source evidence, not a completed copy-trading return.

SEC 0001628280-26-058964 ↗SEC 0001628280-26-057158 ↗SEC 0001628280-26-056260 ↗

Recent Form 4 activity

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2026-08-262026-08-21Meriwether Karen SueS542Not reported
2026-08-152026-08-13Hasley NancyS20,489Not reported
2026-08-132026-08-11ONeill Francis JamesS89,219Not reported
2026-08-132026-08-10ONeill Francis JamesS63,616Not reported
2026-08-122026-08-10RADKE JEFFREY LS80,000Not reported

90-day public availability window, up to 50 records.

Recent institutional filing receipts

Inspect all 50 displayed rows: Recent institutional filing receipts

These are raw ticker-matched positions in recent 13F receipts, including amendments. They are not deduplicated current ownership totals. Open the manager profile to inspect its effective filing book.

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CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM2026-06-302026-08-2565,691$769,899None
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM2026-06-302026-08-25769,899$65,691,000None
CANNELL CAPITAL LLC2026-06-302026-08-19171,080$2,005,058None
FORMULA GROWTH LTD2026-06-302026-08-1831,000$363,320None
SummitTX Capital, L.P.2026-06-302026-08-1556,584$663,164None
Graham Capital Management, L.P.2026-06-302026-08-1520,001$234,412None
SEI INVESTMENTS CO2026-06-302026-08-1563,902$748,931None
SEI INVESTMENTS CO2026-06-302026-08-151,239$14,520None
Federation des caisses Desjardins du Quebec2026-06-302026-08-15750$8,790None
Quarry LP2026-06-302026-08-15143$1,676None
XTX Topco Ltd2026-06-302026-08-15322,417$3,778,727None
CHARLES SCHWAB INVESTMENT MANAGEMENT INC2026-06-302026-08-15148,881$1,744,885None
Sixth Street Partners Management Company, L.P.2026-06-302026-08-15148,881$1,744,885None
Qube Research & Technologies Ltd2026-06-302026-08-15239,317$2,804,795None
OSAIC HOLDINGS, INC.2026-06-302026-08-15125$1,465None
OSAIC HOLDINGS, INC.2026-06-302026-08-15129$1,511None
Squarepoint Ops LLC2026-06-302026-08-1540,428$473,816None
MetLife Investment Management, LLC2026-06-302026-08-1536,306$425,506None
Engineers Gate Manager LP2026-06-302026-08-1598,354$1,152,709None
JANE STREET GROUP, LLC2026-06-302026-08-15402,622$4,718,730None
JANE STREET GROUP, LLC2026-06-302026-08-15549,444$6,439,484None
BOOTHBAY FUND MANAGEMENT, LLC2026-06-302026-08-15138,295$1,620,817None
Legal & General Group Plc2026-06-302026-08-1520,539$240,717None
Legal & General Group Plc2026-06-302026-08-1511,352$133,045None
Legal & General Group Plc2026-06-302026-08-155,935$69,558None
SUSQUEHANNA INTERNATIONAL GROUP, LLP2026-06-302026-08-1511,500$134,780Put
SUSQUEHANNA INTERNATIONAL GROUP, LLP2026-06-302026-08-1569,019$808,903None
Keenan Capital, LLC2026-06-302026-08-153,992,923$46,797,058None
MILLENNIUM MANAGEMENT LLC2026-06-302026-08-1517,491$204,995None
JONES FINANCIAL COMPANIES LLLP2026-06-302026-08-1525,329$348,020None
G2 Investment Partners Management LLC2026-06-302026-08-15640,000$7,500,800None
Holocene Advisors, LP2026-06-302026-08-15300,000$3,516,000None
Lighthouse Investment Partners, LLC2026-06-302026-08-15488,152$5,721,141None
Woodline Partners LP2026-06-302026-08-1557,554$674,533None
GILDER GAGNON HOWE & CO LLC2026-06-302026-08-153,732,024$43,739,321None
Cresset Asset Management, LLC2026-06-302026-08-151,839,620$21,560,346None
MANUFACTURERS LIFE INSURANCE COMPANY, THE2026-06-302026-08-1528,594$335,122None
ROYAL BANK OF CANADA2026-06-302026-08-158,348$98,000None
ROYAL BANK OF CANADA2026-06-302026-08-151,866$22,000None
ALLIANCEBERNSTEIN L.P.2026-06-302026-08-151,447,153$19,333,964None
CITADEL ADVISORS LLC2026-06-302026-08-15864,771$10,135,116None
CITADEL ADVISORS LLC2026-06-302026-08-1549,800$583,656Call
CITADEL ADVISORS LLC2026-06-302026-08-15883,214$10,351,268None
Magnetar Financial LLC2026-06-302026-08-1511,936$139,890None
Jupiter Topco LLC2026-06-302026-08-1523,500$275,538None
STATE OF WISCONSIN INVESTMENT BOARD2026-06-302026-08-1552,843$619,320None
NATIXIS ADVISORS, LLC2026-06-302026-08-1525,313$296,000None
Burkehill Global Management, LP2026-06-302026-08-15100,000$1,172,000None
Azora Capital LP2026-06-302026-08-153,049,846$35,744,195None
TIGER GLOBAL MANAGEMENT LLC2026-06-302026-08-1575,000$879,000None

90-day public filing window, up to 50 source positions.

CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM ↗CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM ↗CANNELL CAPITAL LLC ↗FORMULA GROWTH LTD ↗SummitTX Capital, L.P. ↗Graham Capital Management, L.P. ↗SEI INVESTMENTS CO ↗SEI INVESTMENTS CO ↗Federation des caisses Desjardins du Quebec ↗Quarry LP ↗

Recent Congressional disclosures

No matching Congressional transactions were returned in this source preview.

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Bounded public source preview, up to 25 disclosed events.

How to read the disclosure dates

The tables report different things: insider transactions, institutional positions and Congressional transaction ranges. Read each table with its source dates and units. They cannot be added into a combined ownership percentage.

  1. Company insiders

    SEC Form 4 purchases, sales and awards report transactions and their public filing availability.

  2. Institutional managers

    13F reports disclose delayed quarter-end positions. They are not a record of trades between quarters.

  3. Congressional filers

    Periodic transaction reports disclose transaction dates and amount brackets. Public filing dates determine what researchers could know.

Institutional source directory ↗Congressional source directory ↗

Read the transaction codes

Awards use transaction code A, purchases P and sales S. An acquisition from an award is not the same as an open-market purchase. Joint filers may share a transaction. Use original receipts and availability dates to interpret the events.