Accelerant Holdings (ARX) Insider Trading

Over the last 3 months, ARX insiders made 0 open-market buys and 23 sales, a net sale of -$20.0M (SEC Form 4). Over the last 6 months, 37 institutions increased and 23 reduced their position (13F).

Insider Activity

Sentiment
0/100
Buys (3m)
0
Sells (3m)
23
Net (3m)
-$20.0M
Insider trades by month Buys Sells
Nov
Dec
Mar
Jun
Jul
Aug
Context3-month price +24.2%Institutions reducing (13F)
DateInsiderTypeSharesPrice
Aug 25, 2026Meriwether Karen SuedirectorSell542$19.62
Aug 14, 2026Hasley NancydirectorSell20,489$19.56
Aug 12, 2026ONeill Francis Jamesofficer: Co-Founder, Chief U/W OfficerSell63,616$12.07
Aug 12, 2026ONeill Francis Jamesofficer: Co-Founder, Chief U/W OfficerSell89,219$12.41
Aug 11, 2026RADKE JEFFREY Ldirector, 10 percent owner, officer: Co-Founder, CEOSell80,000$12.09
Aug 4, 2026RADKE JEFFREY Ldirector, 10 percent owner, officer: Co-Founder, CEOSell80,000$12.06
Jul 29, 2026ONeill Francis Jamesofficer: Co-Founder, Chief U/W OfficerSell104,647$14.56
Jul 29, 2026ONeill Francis Jamesofficer: Co-Founder, Chief U/W OfficerSell110,467$14.63
Jul 28, 2026RADKE JEFFREY Ldirector, 10 percent owner, officer: Co-Founder, CEOSell15,223$14.45
Jul 28, 2026RADKE JEFFREY Ldirector, 10 percent owner, officer: Co-Founder, CEOSell80,000$14.63
Jul 27, 2026Sternberg Matthew Davidofficer: COO, Risk ExchangeSell17,568$14.64
Jul 27, 2026Sternberg Matthew Davidofficer: COO, Risk ExchangeTax3,910$13.77
Jul 20, 2026RADKE JEFFREY Ldirector, 10 percent owner, officer: Co-Founder, CEOSell14,777$14.30
Jul 20, 2026RADKE JEFFREY Ldirector, 10 percent owner, officer: Co-Founder, CEOSell80,000$13.51
Jul 16, 2026ONeill Francis Jamesofficer: Co-Founder, Chief U/W OfficerSell82,767$12.71
Jul 16, 2026ONeill Francis Jamesofficer: Co-Founder, Chief U/W OfficerSell83,119$12.84
Jul 14, 2026RADKE JEFFREY Ldirector, 10 percent owner, officer: Co-Founder, CEOSell80,000$13.18
Jul 7, 2026RADKE JEFFREY Ldirector, 10 percent owner, officer: Co-Founder, CEOSell80,000$13.33
Jun 30, 2026RADKE JEFFREY Ldirector, 10 percent owner, officer: Co-Founder, CEOSell80,000$12.87
Jun 29, 2026ONeill Francis Jamesofficer: Co-Founder, Chief U/W OfficerSell73,500$13.06
Jun 25, 2026Hasley NancydirectorSell35,000$13.11
Jun 25, 2026RADKE JEFFREY Ldirector, 10 percent owner, officer: Co-Founder, CEOSell80,000$13.11
Jun 24, 2026ONeill Francis Jamesofficer: Co-Founder, Chief U/W OfficerSell76,464$13.11
Jun 24, 2026ONeill Francis Jamesofficer: Co-Founder, Chief U/W OfficerSell70,536$13.21
May 15, 2026Talach David George PauldirectorGrant23,316
May 15, 2026Wainwright SimondirectorGrant23,316
May 15, 2026Sternberg Matthew Davidofficer: COO, Risk ExchangeGrant279,329
May 15, 2026Little Paul ChristopherdirectorGrant11,658
May 15, 2026Hasley NancydirectorGrant11,658
May 15, 2026Meriwether Karen SuedirectorGrant11,658

Source: ARX SEC Form 4 filings, latest Aug 25, 2026. For informational purposes only — not investment advice.

Institutional activity (13F)

How institutions changed their ARX positions over the last 6 months (SEC Form 13F).

Increased
37
New positions
33
Reduced
23
Sold out
106
Largest moves
InstitutionActionSharesFiled
SECURITY BENEFIT LIFE INSURANCE CO /KS/Unchanged5.9MMay 4, 2026
CAPITAL WORLD INVESTORSReduced5.2MMay 13, 2026
KEENAN CAPITAL, LLCIncreased4.0MMay 15, 2026
GILDER GAGNON HOWE & CO LLCIncreased3.7MMay 15, 2026
AMERICAN CENTURY COMPANIES INCIncreased3.2MMay 15, 2026
BARINGS LLCUnchanged3.1MMay 6, 2026
ALLIANCEBERNSTEIN L.P.Reduced2.8MMay 15, 2026
MARSHALL WACE, LLPIncreased2.3MMay 15, 2026
VANGUARD PORTFOLIO MANAGEMENT LLCNew Position2.1MMay 8, 2026
JPMORGAN CHASE & COIncreased2.0MMay 13, 2026
AZORA CAPITAL LPReduced2.0MMay 15, 2026
VANGUARD CAPITAL MANAGEMENT LLCNew Position1.9MMay 15, 2026
CRESSET ASSET MANAGEMENT, LLCNew Position1.8MMay 15, 2026
FMR LLCIncreased1.8MMay 15, 2026
ARROWMARK COLORADO HOLDINGS LLCReduced1.5MMay 15, 2026

Source: SEC Form 13F filings. For informational purposes only — not investment advice.