ARX · Accelerant Holdings · Shareholders & Ownership

$19.77 +0.01 (+0.05%) At close · Oct 23

Russell 2000 member Rebalance outlook locked

Market Cap

$4.29B

217.19M

Volume · Oct 23 1.7M Avg daily vol (3M) 3.59M

Every disclosed holder of ARX in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.

How the holder list picks a filing →

Who Owns ARX

13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positions

No chart: the summed disclosures exceed shares outstanding, so they are not parts of one whole.

Holder group	Holders	Shares	% Out	Summed
Institutional (13F)	124	69,084,388	31.81%	Yes
Insiders (Forms 3, 4, 5)	0	0	0.00%	No
13D/G-only blocks	5	162,103,331	74.64%	Yes
Remaining	—	13,999,167	-6.45%	Negative
Registered funds (N-PORT, not summed)	25	6,861,776	3.16%	No

Shares outstanding: 217,188,552, the issuer's latest cover-page count restated onto today's split basis.

Insiders are listed but not summed: the issuer has more than one class of common stock and Forms 3, 4 and 5 report one issuer-wide balance across them.

Remaining is negative: the summed disclosures exceed shares outstanding, as when filings are dated at different times or holders that do not disclose their links count the same shares. It is flagged, not clipped.

13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.

Holders of ARX

One row per holder Every filing By ultimate parent

All 13F Funds Insiders 13D/G Non-US

#	Holder	Shares	% Out	Change	As of	Notes
1	ACP Insurance Management, LLC 13G CIK 2078270 · Unknown · Sep 30, 2025 Rule 13d-1(d), exempt investor	90,916,741	41.86%	—	Sep 30, 2025	Rule 13d-1(d), exempt investor
2	RADKE JEFFREY L Insider CIK 1241965 · Aug 10, 2026 Director, Co-Founder, CEO, 10% Owner, issuer-wide, not summed	28,175,542	12.97%	-80,000	Aug 10, 2026	Director, Co-Founder, CEO, 10% Owner, issuer-wide, not summed
2.1	RADKE JEFFREY L 13G CIK 1241965 · Unknown · Sep 30, 2025 Rule 13d-1(d), exempt investor	36,750,813	16.92%	—	Sep 30, 2025	Rule 13d-1(d), exempt investor
3	Lee-Smith Christopher Insider CIK 2008627 · Mar 18, 2026 Director, Co-Founder, Head of Distrib., issuer-wide, not summed	17,784,023	8.19%	+128,644	Mar 18, 2026	Director, Co-Founder, Head of Distrib., issuer-wide, not summed
3.1	Lee-Smith Christopher 13G CIK 2008627 · Unknown · Sep 30, 2025 Rule 13d-1(d), exempt investor	20,386,940	9.39%	—	Sep 30, 2025	Rule 13d-1(d), exempt investor
4	ONeill Francis James Insider CIK 2008632 · Aug 11, 2026 Co-Founder, Chief U/W Officer, issuer-wide, not summed	6,535,934	3.01%	-152,835	Aug 11, 2026	Co-Founder, Chief U/W Officer, issuer-wide, not summed
4.1	ONeill Francis James 13G CIK 2008632 · Unknown · Sep 30, 2025 Rule 13d-1(d), exempt investor	8,079,736	3.72%	—	Sep 30, 2025	Rule 13d-1(d), exempt investor
5	GLAZER CAPITAL, LLC 13G CIK 1076809 · Registered investment adviser · Sep 23, 2026 Rule 13d-1(c), passive investor	5,969,101	2.75%	—	Sep 23, 2026	Rule 13d-1(c), passive investor
6	SECURITY BENEFIT LIFE INSURANCE CO /KS/ 13F CIK 869772 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	5,866,257	2.70%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
7	FMR LLC 13F CIK 315066 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	5,628,679	2.59%	+3,816,472	Jun 30, 2026	carried, not yet filed for the newest quarter
8	Capital World Investors 13F CIK 1422849 · Investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	4,626,664	2.13%	-526,077	Jun 30, 2026	carried, not yet filed for the newest quarter
9	Deer Park Road Corp 13F CIK 1702490 · Holding company · Sep 30, 2026	4,594,265	2.12%	+4,594,265	Sep 30, 2026
10	Keenan Capital, LLC 13F CIK 1647363 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	3,992,923	1.84%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
11	AMERICAN CENTURY COMPANIES INC 13F CIK 748054 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	3,877,619	1.79%	+689,114	Jun 30, 2026	carried, not yet filed for the newest quarter
11.1	Small Cap Value Fund Fund S000005781 · Registered fund · Jun 30, 2026 American Century Capital Portfolios, Inc., not summed	2,105,000	0.97%	+285,000	Jun 30, 2026	American Century Capital Portfolios, Inc., not summed
12	GILDER GAGNON HOWE & CO LLC 13F CIK 902464 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	3,732,024	1.72%	-11,340	Jun 30, 2026	carried, not yet filed for the newest quarter
13	BlackRock, Inc. 13F CIK 2012383 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	3,496,273	1.61%	+3,330,709	Jun 30, 2026	carried, not yet filed for the newest quarter
13.1	iShares MSCI World Small-Cap ETF Fund S000091430 · Registered fund · Aug 31, 2026 iShares Trust, not summed	2,408	0.00%	0	Aug 31, 2026	iShares Trust, not summed
14	BARINGS LLC 13F CIK 9015 · Registered investment adviser · Sep 30, 2026	3,128,867	1.44%	0	Sep 30, 2026
15	Azora Capital LP 13F CIK 1700272 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	3,049,846	1.40%	+1,069,635	Jun 30, 2026	carried, not yet filed for the newest quarter
16	VANGUARD PORTFOLIO MANAGEMENT LLC 13F CIK 2100121 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	2,418,330	1.11%	+304,765	Jun 30, 2026	carried, not yet filed for the newest quarter
17	JPMORGAN CHASE & CO 13F CIK 19617 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	2,176,807	1.00%	+156,439	Jun 30, 2026	carried, not yet filed for the newest quarter
18	GOLDMAN SACHS GROUP INC 13F CIK 886982 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	2,013,582	0.93%	+1,971,913	Jun 30, 2026	carried, not yet filed for the newest quarter
19	Hasley Nancy Insider CIK 2012400 · Aug 13, 2026 Director, General Counsel, issuer-wide, not summed	1,854,865	0.85%	-20,489	Aug 13, 2026	Director, General Counsel, issuer-wide, not summed
20	Cresset Asset Management, LLC 13F CIK 1761013 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,839,620	0.85%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
21	CITADEL ADVISORS LLC 13F CIK 1423053 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,747,985	0.80%	+603,779	Jun 30, 2026	carried, not yet filed for the newest quarter
22	VANGUARD CAPITAL MANAGEMENT LLC 13F CIK 2100119 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,657,197	0.76%	-281,741	Jun 30, 2026	carried, not yet filed for the newest quarter
23	VANGUARD TOTAL STOCK MARKET INDEX FUND Fund S000002848 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	1,601,340	0.74%	-279,400	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
24	ALLIANCEBERNSTEIN L.P. 13F CIK 1109448 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,447,153	0.67%	-1,353,035	Jun 30, 2026	carried, not yet filed for the newest quarter
25	Owls Nest Partners IA, LLC 13F CIK 1845806 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,251,884	0.58%	+1,042,177	Jun 30, 2026	carried, not yet filed for the newest quarter
26	Green Jay Michael Insider CIK 2008767 · Mar 23, 2026 Chief Financial Officer, issuer-wide, not summed	1,175,589	0.54%	-50,000	Mar 23, 2026	Chief Financial Officer, issuer-wide, not summed
27	VANGUARD SMALL-CAP INDEX FUND Fund S000002845 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	1,163,270	0.54%	-152,760	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
28	MARSHALL WACE, LLP 13F CIK 1318757 · Exempt reporting adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,109,675	0.51%	-1,164,477	Jun 30, 2026	carried, not yet filed for the newest quarter
29	JANE STREET GROUP, LLC 13F CIK 1595888 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	952,066	0.44%	+91,369	Jun 30, 2026	carried, not yet filed for the newest quarter
30	STATE STREET CORP 13F CIK 93751 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	900,775	0.41%	+863,469	Jun 30, 2026	carried, not yet filed for the newest quarter
31	GEODE CAPITAL MANAGEMENT, LLC 13F CIK 1214717 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	809,620	0.37%	+809,620	Jun 30, 2026	carried, not yet filed for the newest quarter
32	VANGUARD SMALL-CAP VALUE INDEX FUND Fund S000002847 · Registered fund · Jun 30, 2026 VANGUARD INDEX FUNDS, not summed	737,420	0.34%	+316,869	Jun 30, 2026	VANGUARD INDEX FUNDS, not summed
33	G2 Investment Partners Management LLC 13F CIK 1593404 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	640,000	0.29%	+267,189	Jun 30, 2026	carried, not yet filed for the newest quarter
34	BANK OF AMERICA CORP /DE/ 13F CIK 70858 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	603,858	0.28%	+423,672	Jun 30, 2026	carried, not yet filed for the newest quarter
35	Sternberg Matthew David Insider CIK 2008628 · Jul 27, 2026 COO, Risk Exchange, issuer-wide, not summed	596,482	0.27%	-21,478	Jul 27, 2026	COO, Risk Exchange, issuer-wide, not summed
36	UBS Group AG 13F CIK 1610520 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	554,448	0.26%	-131,199	Jun 30, 2026	carried, not yet filed for the newest quarter
37	Walleye Capital LLC 13F CIK 1758720 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	541,257	0.25%	+541,257	Jun 30, 2026	carried, not yet filed for the newest quarter
38	Bridge Builder Small/Mid Cap Value Fund Fund S000048337 · Registered fund · Jun 30, 2026 Bridge Builder Trust, not summed	517,569	0.24%	+136,166	Jun 30, 2026	Bridge Builder Trust, not summed
39	Lighthouse Investment Partners, LLC 13F CIK 1600344 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	488,152	0.22%	+402,746	Jun 30, 2026	carried, not yet filed for the newest quarter
40	ArrowMark Colorado Holdings LLC 13F CIK 1483859 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	477,208	0.22%	-1,071,016	Jun 30, 2026	carried, not yet filed for the newest quarter
41	PANAGORA ASSET MANAGEMENT INC 13F CIK 883677 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	408,931	0.19%	+408,931	Jun 30, 2026	carried, not yet filed for the newest quarter
42	BNP PARIBAS ARBITRAGE, SA 13F CIK 1166588 · Non-US institution · Jun 30, 2026 carried, not yet filed for the newest quarter	372,813	0.17%	+67,569	Jun 30, 2026	carried, not yet filed for the newest quarter
43	NORTHERN TRUST CORP 13F CIK 73124 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	369,625	0.17%	+353,206	Jun 30, 2026	carried, not yet filed for the newest quarter
43.1	Small Cap Index Fund Fund S000001245 · Registered fund · Jun 30, 2026 Northern Funds, not summed	30,959	0.01%	—	Jun 30, 2026	Northern Funds, not summed
44	XTX Topco Ltd 13F CIK 1828301 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	322,417	0.15%	+84,748	Jun 30, 2026	carried, not yet filed for the newest quarter
45	SmallCap Growth Fund I Fund S000007175 · Registered fund · Jul 31, 2026 Principal Funds, Inc, not summed	305,787	0.14%	+93,912	Jul 31, 2026	Principal Funds, Inc, not summed
46	Holocene Advisors, LP 13F CIK 1700574 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	300,000	0.14%	+300,000	Jun 30, 2026	carried, not yet filed for the newest quarter
47	RENAISSANCE TECHNOLOGIES LLC 13F CIK 1037389 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	296,100	0.14%	+19,500	Jun 30, 2026	carried, not yet filed for the newest quarter
48	MORGAN STANLEY 13F CIK 895421 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	279,971	0.13%	-7,204	Jun 30, 2026	carried, not yet filed for the newest quarter
49	Qube Research & Technologies Ltd 13F CIK 1729829 · Exempt reporting adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	239,317	0.11%	-691,625	Jun 30, 2026	carried, not yet filed for the newest quarter
50	Huber Linda Insider CIK 1327278 · Mar 31, 2026 Chief Financial Officer, issuer-wide, not summed	214,408	0.10%	—	Mar 31, 2026	Chief Financial Officer, issuer-wide, not summed

Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.

Showing 1–50 of 156 holders

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Key facts CIK 1997350 CUSIP G00894108 13F (30d) 13 filings 13 filers Visit website Investor relations