Arch Capital Group Ltd.
Arch Capital Group Ltd. (ACGLO) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · ACGLO · as of Sep 30, 2025
Ownership Breakdown
2
Institutional Holders
▲ 1 vs Q2
$10,315
Total Inst. Value
▲ $429 vs Q2
583.09M
Shares Outstanding
freeFloat 58.86%
473
13F Shares Held
▼ 9 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
ACGLO largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 2 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
PNC FINANCIAL SERVICES GROUP, INC. fire, marine & casualty insurance | 440 | 0.01% | 0.01% | $9.60M | Nov 7, 2025 | ▼ 42 |
NBC SECURITIES, INC. fire, marine & casualty insurance | 33 | 0.00% | 0.00% | $719,000 | 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 shares1
New Positions
first time holders1
Decreased
−42 shares0
Sold Out
fully exitedNet shares change (top 50)
42
+0 / −42
Net new holders
+0
1 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
ACGLO insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
17
Buy transactions
2
Sell transactions
8.50
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 |
|---|---|---|---|---|---|---|---|
Posner Brian S director | Jun 3, 2026 | Sale | 3,000 | $19.66 | $59.0K | 0 | Form 4 ↗ |
Posner Brian S director | May 11, 2026 | Sale | 2,000 | $17.14 | $34.3K | 0 | Form 4 ↗ |
Triplett Neal F director | May 5, 2026 | Award | 1,327 | — | — | 8.0K | Form 4 ↗ |
Triplett Neal F director | May 5, 2026 | Award | 2,071 | — | — | 6.7K | Form 4 ↗ |
Posner Brian S director | May 5, 2026 | Award | 2,071 | — | — | 122.2K | Form 4 ↗ |
MOCZARSKI ALEXANDER S director | May 5, 2026 | Award | 2,071 | — | — | 4.0K | Form 4 ↗ |
MALLESCH EILEEN A director | May 5, 2026 | Award | 2,071 | — | — | 13.8K | Form 4 ↗ |
KILCOYNE MOIRA A. director | May 5, 2026 | Award | 1,327 | — | — | 35.8K | Form 4 ↗ |
KILCOYNE MOIRA A. director | May 5, 2026 | Award | 2,071 | — | — | 34.5K | Form 4 ↗ |
Houston Daniel Joseph director | May 5, 2026 | Award | 1,327 | — | — | 13.3K | 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
Arch Capital Group Ltd. (ACGLO) is primarily owned by institutional investors, who hold approximately 0.0% of total shares outstanding. Company insiders own approximately 41.14%, while retail and public investors account for the remaining 58.86%.
The largest institutional shareholder of Arch Capital Group Ltd. is PNC FINANCIAL SERVICES GROUP, INC., holding approximately 440 shares — equal to 0.01% of outstanding shares — as of September 30, 2025.
A total of 2 institutional investors currently hold ACGLO stock, with a combined institutional value of approximately $10,315 as of the most recent 13F filing period.
Frequently asked questions
ACGLO ownershipArch Capital Group Ltd. (ACGLO) is primarily owned by institutional investors, who hold approximately 0.0% of shares. The largest shareholder is PNC FINANCIAL SERVICES GROUP, INC. with a 0.01% stake. Company insiders hold 41.14%. Data sourced from SEC Form 13F as of September 30, 2025.