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 2026-10-10T12:08:28.848Z

Separate the three disclosure sources

Step 1 of 3

Recent Form 4 activity

Accelerant Holdings: source evidence dated 2026-10-10T12:08:28.848Z.

Available
2026-08-26
Trade date
2026-08-21
Reporting owners
Meriwether Karen Sue
Code
S
Shares
542
Reported value
Not reported
What you should see

The displayed owner or issuer and source fields identify the receipt to verify; keep reporting and availability dates separate.

Step 2 of 3

Is this an insider transaction, 13F holding, or Congressional event?

Each source has different dates and units. Raw ticker-matched receipts, including amendments, are not deduplicated current ownership totals.

SEC 0001628280-26-058964
What you should see

Follow the source receipt or manager/member profile. Avoid combining transaction value and 13F position value into an ownership percentage.

Step 3 of 3

Read ARX fundamentals

Follow the source receipt or manager/member profile. Avoid combining transaction value and 13F position value into an ownership percentage.

Read ARX fundamentals
What you should see

Keep reporting dates and units beside the answer, and inspect its original citations.

Recent Form 4 activity

See the complete recent form 4 activity
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
2026-08-052026-08-03RADKE JEFFREY LS80,000Not reported
2026-07-302026-07-28ONeill Francis JamesS104,647Not reported
2026-07-302026-07-27ONeill Francis JamesS110,467Not reported
2026-07-292026-07-27RADKE JEFFREY LS15,223Not reported
2026-07-292026-07-27RADKE JEFFREY LS80,000Not reported
2026-07-282026-07-27Sternberg Matthew DavidS17,568Not reported
2026-07-212026-07-20RADKE JEFFREY LS80,000Not reported
2026-07-212026-07-17RADKE JEFFREY LS14,777Not reported
2026-07-172026-07-15ONeill Francis JamesS82,767Not reported
2026-07-172026-07-14ONeill Francis JamesS83,119Not reported
2026-07-152026-07-13RADKE JEFFREY LS80,000Not reported

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

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.

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.

No records are available for this view.

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.

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