Comparable stake leader
ACP Accelerant Holdings, L.P.
SEC ownership of Accelerant Holdings
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001997350.
Disclosed value leader
ACP Accelerant Holdings, L.P.
Comparable rows
50/50
Latest evidence
13 Aug 2026
- Public ticker
- ARX on NYSE
- Parsed ownership sources
-
13D/G, 3/4/5, and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
ACP Accelerant Holdings, L.P.
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
ACP Accelerant Holdings, L.P.
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
13 Aug 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001997350
- Issuer location
- Grand Cayman, Cayman Islands
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of Accelerant Holdings (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
ACP Accelerant Holdings, ...
Disclosed value leader
ACP Accelerant Holdings, ...
Comparable rows
50/50
Latest evidence
13 Aug 2026
13D/G
3/4/5
13F
Lead comparable stake: 44%
13D/G row: ACP Accelerant Holdings, L.P.
Showing 1-8 of 50 holder rows.
Quick read
ACP Accelerant Holdings, L.P. leads the comparable SEC ownership view at 44%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens ACP Accelerant Holdings, L.P.'s linked filing trail.
Comparable ownership
Top 5
ACP Accelerant Holdings, L.P.
44%
Jeffrey L. Radke
30%
Lee-Smith Christopher
17%
Francis James O'Neill
7%
Capital World Investors
5.1%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| ACP Accelerant Holdings, L.P. |
13D/G
ACP Insurance Management, LLC
|
44%
|
$1,353,750,273
90,916,741 shares
|
$0 | 30 Sep 2025 |
| Jeffrey L. Radke |
13D/G
3/4/5
RADKE JEFFREY L · Co-Founder, CEO, Director, 10%+ Owner
|
30%
|
$547,219,606
36,750,813 shares
|
$0 | 30 Sep 2025 |
| Lee-Smith Christopher |
13D/G
3/4/5
Co-Founder, Head of Distrib., Director
|
17%
|
$303,561,537
20,386,940 shares
|
$0 | 30 Sep 2025 |
| Francis James O'Neill |
13D/G
3/4/5
ONeill Francis James · Co-Founder, Chief U/W Officer
|
7%
|
$120,307,269
8,079,736 shares
|
$0 | 30 Sep 2025 |
| Capital World Investors |
13D/G
13F
Company
|
5.1%
|
$85,665,892
5,753,250 shares
|
$0 | 30 Sep 2025 |
| Nancy Hasley |
3/4/5
Director
|
0.9%
|
$32,263,826
1,854,865 shares
|
-$859,787 | 13 Aug 2026 |
| Jay Michael Green |
3/4/5
Chief Financial Officer
|
0.57%
|
$15,007,216
1,175,589 shares
|
-$638,285 | 23 Mar 2026 |
| Matthew David Sternberg |
3/4/5
COO, Risk Exchange
|
0.29%
|
$8,732,854
596,482 shares
|
-$182,510 | 23 Jul 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$19,678,162.
Buys
$1,886,836
Insiders: 6
Sells
$21,564,999
Insiders: 5
Net
-$19,678,162
Shares: -1,480,340
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 140,552
Shares: 1,620,892
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 1,570,892 | $0 | $20,926,714 | -$20,926,714 |
| 3-6 | 0 | 50,000 | $0 | $638,285 | -$638,285 |
| 6-9 | 542 | 0 | $7,951 | $0 | +$7,951 |
| 9-12 | 140,010 | 0 | $1,878,885 | $0 | +$1,878,885 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-17 of 17 reporting-owner rows connected to Accelerant Holdings. Open a relationship link for the CIK-to-CIK filing trail.
Rows
17
Largest Forms 3/4/5 holder
Jeffrey L. Radke
Net 12M change
-$19,678,162
Latest report
13 Aug 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Jeffrey L. Radke | Co-Founder, CEO, Director, 10%+ Owner | $340,390,498 | -$7,813,422 | -2.2% | Mixed | 10 Aug 2026 |
| Lee-Smith Christopher | Co-Founder, Head of Distrib., Director | $190,466,886 | +$197,240 | +0.1% | Mixed | 18 Mar 2026 |
| Francis James O'Neill | Co-Founder, Chief U/W Officer | $80,996,592 | -$10,490,123 | -11% | Mixed | 10 Aug 2026 |
| Nancy Hasley | Director | $32,263,826 | -$859,787 | -2.6% | Mixed | 13 Aug 2026 |
| Jay Michael Green | Chief Financial Officer | $15,007,216 | -$638,285 | -4.1% | Filing P/S | 23 Mar 2026 |
| Matthew David Sternberg | COO, Risk Exchange | $8,732,854 | -$182,510 | -2% | Filing P/S | 23 Jul 2026 |
| Linda Huber | Chief Financial Officer | $3,505,570 | Mixed | 31 Mar 2026 | ||
| Clifford R. Jenks | General Counsel | $1,402,225 | Mixed | 31 Mar 2026 | ||
| Simon Wainwright | Director | $311,501 | Mixed | 13 May 2026 | ||
| David George Paul Talach | Director | $311,501 | Mixed | 13 May 2026 | ||
| Karen Sue Meriwether | Director | $286,037 | +$7,951 | +2.9% | Mixed | 13 May 2026 |
| Paul Christopher Little | Director | $278,796 | Mixed | 13 May 2026 | ||
| Samuel Gaynor | Director | $100,773 | +$100,774 | +100% | Filing P/S | 19 Nov 2025 |
| Keoni Andrew Schwartz | Director, 10%+ Owner | $0 | Mixed | 25 Jul 2025 | ||
| Kunal Arora | Director | Mixed | 23 Jul 2025 | |||
| Wendy Liisa Harrington | Director | Mixed | 25 Jul 2025 | |||
| Michael Kenneth Searles | Director | Mixed | 23 Jul 2025 |
Recent insider transactions for Accelerant Holdings
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Nancy Hasley | ARX | Class A Common Shares | Sale | -1.5% | $400,839 | $19.56 | -20,489 | 1,341,834 | 13 Aug 2026 | Direct |
| Francis James O'Neill | ARX | Class A Common Shares | Sale | -1.38% | $1,107,217 | $12.41 | -89,219 | 6,369,290 | 11 Aug 2026 | By Famed Ventures Limited |
| Francis James O'Neill | ARX | Class A Common Shares | Sale | -0.98% | $767,667 | $12.07 | -63,616 | 6,458,509 | 10 Aug 2026 | By Famed Ventures Limited |
| Jeffrey L. Radke | ARX | Class A Common Shares | Sale | -0.29% | $967,096 | $12.09 | -80,000 | 27,591,939 | 10 Aug 2026 | By LLC |
| Jeffrey L. Radke | ARX | Class A Common Shares | Sale | -0.29% | $964,528 | $12.06 | -80,000 | 27,671,939 | 03 Aug 2026 | By LLC |
| Francis James O'Neill | ARX | Class A Common Shares | Sale | -1.58% | $1,523,451 | $14.56 | -104,647 | 6,522,125 | 28 Jul 2026 | By Famed Ventures Limited |
| Francis James O'Neill | ARX | Class A Common Shares | Sale | -1.64% | $1,616,221 | $14.63 | -110,467 | 6,626,772 | 27 Jul 2026 | By Famed Ventures Limited |
| Jeffrey L. Radke | ARX | Class A Common Shares | Sale | -0.34% | $1,390,533 | $14.60 | -95,223 | 27,751,939 | 27 Jul 2026 | By LLC |
| Matthew David Sternberg | ARX | Class A Common Shares | Sale | -2.86% | $257,206 | $14.64 | -17,568 | 596,482 | 27 Jul 2026 | Direct |
| Matthew David Sternberg | ARX | Class A Common Shares | Tax liability | -0.63% | -3,910 | 614,050 | 23 Jul 2026 | Direct | ||
| Jeffrey L. Radke | ARX | Class A Common Shares | Sale | -0.29% | $1,080,544 | $13.51 | -80,000 | 27,847,162 | 20 Jul 2026 | By LLC |
| Jeffrey L. Radke | ARX | Class A Common Shares | Sale | -0.05% | $211,279 | $14.30 | -14,777 | 27,927,162 | 17 Jul 2026 | By LLC |
| Francis James O'Neill | ARX | Class A Common Shares | Sale | -1.21% | $1,052,051 | $12.71 | -82,767 | 6,737,239 | 15 Jul 2026 | By Famed Ventures Limited |
| Francis James O'Neill | ARX | Class A Common Shares | Sale | -1.2% | $1,067,639 | $12.84 | -83,119 | 6,820,006 | 14 Jul 2026 | By Famed Ventures Limited |
| Jeffrey L. Radke | ARX | Class A Common Shares | Sale | -0.29% | $1,054,096 | $13.18 | -80,000 | 27,941,939 | 13 Jul 2026 | By LLC |
| Jeffrey L. Radke | ARX | Class A Common Shares | Sale | -0.28% | $1,066,224 | $13.33 | -80,000 | 28,021,939 | 06 Jul 2026 | By LLC |
| Jeffrey L. Radke | ARX | Class A Common Shares | Sale | -0.28% | $1,029,880 | $12.87 | -80,000 | 28,101,939 | 29 Jun 2026 | By LLC |
| Francis James O'Neill | ARX | Class A Common Shares | Sale | -1.05% | $968,899 | $13.18 | -73,500 | 6,903,125 | 26 Jun 2026 | By Famed Ventures Limited |
| Francis James O'Neill | ARX | Class A Common Shares | Sale | -1.04% | $959,778 | $13.06 | -73,500 | 6,976,625 | 25 Jun 2026 | By Famed Ventures Limited |
| Nancy Hasley | ARX | Class A Common Shares | Sale | -2.5% | $458,948 | $13.11 | -35,000 | 1,362,323 | 23 Jun 2026 | Direct |
| Jeffrey L. Radke | ARX | Class A Common Shares | Sale | -0.28% | $1,048,608 | $13.11 | -80,000 | 28,181,939 | 23 Jun 2026 | By LLC |
| Francis James O'Neill | ARX | Class A Common Shares | Sale | -1.07% | $1,002,428 | $13.11 | -76,464 | 7,050,125 | 23 Jun 2026 | By Famed Ventures Limited |
| Francis James O'Neill | ARX | Class A Common Shares | Sale | -0.98% | $931,583 | $13.21 | -70,536 | 7,126,589 | 22 Jun 2026 | By Famed Ventures Limited |
| Matthew David Sternberg | ARX | Class A Common Shares | Award | 82.5% | 279,329 | 617,960 | 13 May 2026 | Direct | ||
| Simon Wainwright | ARX | Class A Common Shares | Award | 23,316 | 23,316 | 13 May 2026 | Direct | |||
| David George Paul Talach | ARX | Class A Common Shares | Award | 23,316 | 23,316 | 13 May 2026 | Direct | |||
| Karen Sue Meriwether | ARX | Class A Common Shares | Award | 119.5% | 11,658 | 21,410 | 13 May 2026 | Direct | ||
| Nancy Hasley | ARX | Class A Common Shares | Award | 0.84% | 11,658 | 1,397,323 | 13 May 2026 | Direct | ||
| Paul Christopher Little | ARX | Class A Common Shares | Award | 126.6% | 11,658 | 20,868 | 13 May 2026 | Direct | ||
| Jay Michael Green | ARX | Class A Common Shares | Sale | -4.08% | $638,285 | $12.77 | -50,000 | 1,175,589 | 23 Mar 2026 | Direct |
| Jeffrey L. Radke | ARX | Class A Common Shares | Award | 896.5% | 300,171 | 333,652 | 18 Mar 2026 | Direct | ||
| Francis James ONeill | ARX | Class A Common Shares | Award | 1.78% | 128,644 | 7,363,769 | 18 Mar 2026 | Direct | ||
| Christopher Lee-Smith | ARX | Class A Common Shares | Award | 0.73% | 128,644 | 17,784,023 | 18 Mar 2026 | Direct | ||
| Matthew David Sternberg | ARX | Class A Common Shares | Award | 114.4% | 180,667 | 338,631 | 18 Mar 2026 | Direct | ||
| Jay Michael Green | ARX | Class A Common Shares | Tax liability | -2.28% | -28,625 | 1,225,589 | 17 Mar 2026 | Direct | ||
| Jay Michael Green | ARX | Class A Common Shares | Tax liability | -13.8% | -200,637 | 1,254,214 | 02 Feb 2026 | Direct | ||
| Karen Sue Meriwether | ARX | Class A Common Shares | Purchase | 5.88% | $7,951 | $14.67 | 542 | 9,752 | 08 Dec 2025 | Direct |
| Christopher Lee-Smith | ARX | Class A Common Shares | Purchase | 0.08% | $197,240 | $13.42 | 14,700 | 17,655,379 | 19 Nov 2025 | Direct |
| Samuel Gaynor | ARX | Class A Common Shares | Purchase | $100,774 | $13.44 | 7,500 | 7,500 | 19 Nov 2025 | Direct | |
| Francis James ONeill | ARX | Class A Common Shares | Purchase | 0.53% | $506,810 | $13.34 | 38,000 | 7,235,125 | 18 Nov 2025 | Direct |
| Matthew David Sternberg | ARX | Class A Common Shares | Purchase | 3.74% | $74,696 | $13.10 | 5,700 | 157,964 | 17 Nov 2025 | Direct |
| Jeffrey L. Radke | ARX | Class A Common Shares | Purchase | 0.26% | $999,366 | $13.48 | 74,110 | 28,261,939 | 14 Nov 2025 | By LLC |
* marks a reported price that did not pass the local price check.