Accelerant (ARX)
Connects specialist underwriters with risk-capital partners through a data-driven insurance exchange.
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13F · 13D/G · Form 4
| Institutions | ≈ 29.74% | 64.59M shares | |
|---|---|---|---|
| 121 holders · as of Jun 30, 2026 · largest filers plus last quarter's tail | |||
| Insiders | 78.29% | 170.05M shares | |
| 15 holders · as of Aug 25, 2026 | |||
| Adds to | 108.03% | ||
217.19M company shares as of Sep 22, 2026 · institutions as of Jun 30, 2026 · holders as of their latest filing
This quarter's institutional total failed a plausibility check; shown: the largest filers plus last quarter's remainder.
These groups come from separate filings that can overlap, so they add to 108.03%; nothing is left for Other.
This company has 2 share classes; every stake here is a share of the whole company.
13F, as of Jun 30, 2026
121 holders · 64.59M shares · 40 new positions · 82 increased · 27 reduced · 28 closed
| Holder | Shares | % of company | Chg q/q | Filed |
|---|---|---|---|---|
| Security Benefit Life Insurance Co /KS/ | 5.87M | 2.70% | 0 | Jul 23, 2026 |
| FMR LLC | 5.63M | 2.59% | +3.82M | Aug 13, 2026 |
| Capital World Investors | 4.63M | 2.13% | −526.1K | Aug 12, 2026 |
| Keenan Capital, LLC | 3.99M | 1.84% | 0 | Aug 14, 2026 |
| American Century Companies Inc | 3.88M | 1.79% | +689.1K | Aug 12, 2026 |
| Gilder Gagnon Howe & Co LLC | 3.73M | 1.72% | −11.3K | Aug 14, 2026 |
| BlackRock, Inc. | 3.50M | 1.61% | +3.33M | Aug 7, 2026 |
| Barings LLC | 3.13M | 1.44% | 0 | Aug 7, 2026 |
13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| ACP Accelerant Holdings, L.P. | 42.90% | 85.98M | 13G | Nov 14, 2025 |
| Radke Jeffrey L | 29.90% | 36.75M | 13G | Nov 14, 2025 |
| Lee-Smith Christopher | 17.40% | 20.39M | 13G | Nov 14, 2025 |
| ONeill Francis James | 7.00% | 8.08M | 13G | Nov 14, 2025 |
Form 4
Latest trades
| Date | Insider | Type | Shares | Avg price | Owned after |
|---|---|---|---|---|---|
| Aug 21, 2026 | Karen Sue Meriwetherdirector | Sale | 542 | $19.62 | 20,868 |
| Aug 13, 2026 | Nancy Hasleydirector | Sale | 20,489 | $19.56 | 1,341,834 |
| Aug 11, 2026 | Francis James ONeillofficer: Co-Founder, Chief U/W Officer | Sale | 89,219 | $12.41 | 6,369,290 |
| Aug 10, 2026 | Francis James ONeillofficer: Co-Founder, Chief U/W Officer | Sale | 63,616 | $12.07 | 6,458,509 |
| Aug 10, 2026 | Jeffrey L. Radkedirector, 10 percent owner, officer: Co-Founder, CEO | Sale | 80,000 | $12.09 | 27,591,939 |
| Aug 3, 2026 | Jeffrey L. Radkedirector, 10 percent owner, officer: Co-Founder, CEO | Sale | 80,000 | $12.06 | 27,671,939 |
| Jul 28, 2026 | Francis James ONeillofficer: Co-Founder, Chief U/W Officer | Sale | 104,647 | $14.56 | 6,522,125 |
| Jul 27, 2026 | Francis James ONeillofficer: Co-Founder, Chief U/W Officer | Sale | 110,467 | $14.63 | 6,626,772 |
| Jul 27, 2026 | Jeffrey L. Radkedirector, 10 percent owner, officer: Co-Founder, CEO | Sale · 2 lots | 95,223 | $14.60 | 27,751,939 |
| Jul 27, 2026 | Matthew David Sternbergofficer: COO, Risk Exchange | Sale | 17,568 | $14.64 | 596,482 |
House and Senate disclosures
Not reported.