Accelerant Holdings
Accelerant Holdings (ARX) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · ARX · as of Sep 30, 2025
Ownership Breakdown
91
Institutional Holders
▲ 91 vs Q2
$757.66M
Total Inst. Value
▲ $757.66M vs Q2
218.20M
Shares Outstanding
freeFloat 25.57%
51.35M
13F Shares Held
▲ 51.35M vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
ARX largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
SECURITY BENEFIT LIFE INSURANCE CO /KS/ insurance agents, brokers & service | 5.87M | 3.61% | 3.61% | $80.80B | Nov 12, 2025 | NEW |
CAPITAL WORLD INVESTORS insurance agents, brokers & service | 5.75M | 2.79% | 2.79% | $85.67B | Nov 13, 2025 | NEW |
GILDER GAGNON HOWE & CO LLC insurance agents, brokers & service | 3.90M | 2.40% | 2.40% | $58.05B | Nov 14, 2025 | NEW |
BARINGS LLC insurance agents, brokers & service | 3.13M | 1.93% | 1.93% | $46.37B | Nov 10, 2025 | NEW |
ALLIANCEBERNSTEIN L.P. insurance agents, brokers & service | 2.79M | 1.72% | 1.72% | $41.53B | Nov 14, 2025 | NEW |
T. ROWE PRICE INVESTMENT MANAGEMENT, INC. insurance agents, brokers & service | 2.36M | 1.45% | 1.45% | $35.08B | Nov 14, 2025 | NEW |
BLACKROCK, INC. insurance agents, brokers & service | 2.31M | 1.42% | 1.42% | $34.35B | Nov 12, 2025 | NEW |
VANGUARD GROUP INC insurance agents, brokers & service | 2.25M | 1.38% | 1.38% | $33.48B | Nov 7, 2025 | NEW |
DEER PARK ROAD CORP insurance agents, brokers & service | 2.10M | 1.29% | 1.29% | $29.69B | Nov 14, 2025 | NEW |
BALYASNY ASSET MANAGEMENT L.P. insurance agents, brokers & service | 2.02M | 1.24% | 1.24% | $30.06B | Nov 14, 2025 | NEW |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
0
Increased
+0 shares50
New Positions
first time holders0
Decreased
−0 shares0
Sold Out
fully exitedNet shares change (top 50)
+0
+0 / −0
Net new holders
+50
50 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
ARX insider trading · insider activity
Source: SEC Form 4
Insiders have been net buyers of shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
2
Buy transactions
0
Sell transactions
0.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Sternberg Matthew David COO, Risk Exchange | May 13, 2026 | Award | 279,329 | — | — | 618.0K | Form 4 ↗ |
Wainwright Simon director | May 13, 2026 | Award | 23,316 | — | — | 23.3K | Form 4 ↗ |
Talach David George Paul director | May 13, 2026 | Award | 23,316 | — | — | 23.3K | Form 4 ↗ |
Meriwether Karen Sue director | May 13, 2026 | Award | 11,658 | — | — | 21.4K | Form 4 ↗ |
Hasley Nancy director | May 13, 2026 | Award | 11,658 | — | — | 1.40M | Form 4 ↗ |
Little Paul Christopher director | May 13, 2026 | Award | 11,658 | — | — | 20.9K | Form 4 ↗ |
Green Jay Michael Chief Financial Officer | Mar 23, 2026 | Sale | 50,000 | $12.77 | $638.3K | 1.18M | Form 4 ↗ |
RADKE JEFFREY L Co-Founder, CEO | Mar 18, 2026 | Award | 300,171 | — | — | 333.7K | Form 4 ↗ |
ONeill Francis James Co-Founder, Chief U/W Officer | Mar 18, 2026 | Award | 128,644 | — | — | 7.36M | Form 4 ↗ |
Lee-Smith Christopher Co-Founder, Head of Distrib. | Mar 18, 2026 | Award | 128,644 | — | — | 17.78M | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Accelerant Holdings (ARX) is primarily owned by institutional investors, who hold approximately 23.5% of total shares outstanding. Company insiders own approximately 74.43%, while retail and public investors account for the remaining 2.04%.
The largest institutional shareholder of Accelerant Holdings is SECURITY BENEFIT LIFE INSURANCE CO /KS/, holding approximately 5.87 million shares — equal to 3.61% of outstanding shares — as of September 30, 2025.
A total of 91 institutional investors currently hold ARX stock, with a combined institutional value of approximately $757,658,145 as of the most recent 13F filing period.
Frequently asked questions
ARX ownershipAccelerant Holdings (ARX) is primarily owned by institutional investors, who hold approximately 23.5% of shares. The largest shareholder is SECURITY BENEFIT LIFE INSURANCE CO /KS/ with a 3.61% stake. Company insiders hold 74.43%. Data sourced from SEC Form 13F as of September 30, 2025.