Arch Capital Group Ltd. (ACGL) Ownership
ACGL ownership summary
as of October 18, 2026- Institutions
- 94.1% of shares outstanding
- Insiders
- 2.79% of shares outstanding
- Shares outstanding
- 341.2M
- Float
- 326.9M shares available to trade
- Short interest
- 2.64% 7.7M shares short
- Days to cover
- 1.74 short interest up 5.8% vs prior month
- Institutions 94.08%
- Insiders 2.79%
- Other investors 3.14%
ACGL top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | BlackRock Inc | 8.86% | 30.2M | $3.06B | −1.1M (−3.6%) | June 30, 2026 |
| 2 | Vanguard Capital Management, LLC | 6.51% | 22.2M | $2.25B | −391,181 (−1.7%) | June 30, 2026 |
| 3 | Artisan Partners Limited Partnership | 6.33% | 21.6M | $2.19B | −1.1M (−4.7%) | June 30, 2026 |
| 4 | State Street Corp | 4.76% | 16.3M | $1.65B | +490 (+0.0%) | June 30, 2026 |
| 5 | BAMCO Inc | 4.65% | 15.9M | $1.61B | −837,309 (−5.0%) | June 30, 2026 |
| 6 | Vanguard Portfolio Management, LLC | 4.26% | 14.5M | $1.47B | −185,456 (−1.3%) | June 30, 2026 |
| 7 | WCM Investment Management | 3.51% | 12.0M | $1.21B | −628,838 (−5.0%) | June 30, 2026 |
| 8 | Geode Capital Management, LLC | 3.08% | 10.5M | $1.06B | −78,549 (−0.7%) | June 30, 2026 |
| 9 | JPMorgan Chase & Co | 2.05% | 7.0M | $708.0M | +209,933 (+3.1%) | June 30, 2026 |
| 10 | Amvescap Plc. | 1.45% | 4.9M | $501.0M | +887,704 (+21.9%) | June 30, 2026 |
| 11 | NORGES BANK | 1.37% | 4.7M | $473.5M | −153,390 (−3.2%) | June 30, 2026 |
| 12 | Arrowstreet Capital Limited Partnership | 1.32% | 4.5M | $455.1M | +2.6M (+135.3%) | June 30, 2026 |
| 13 | Morgan Stanley - Brokerage Accounts | 1.28% | 4.4M | $441.5M | +98,725 (+2.3%) | June 30, 2026 |
| 14 | Northern Trust Corp | 1.25% | 4.3M | $433.6M | −191,064 (−4.3%) | June 30, 2026 |
| 15 | Dimensional Fund Advisors, Inc. | 1.24% | 4.2M | $427.2M | +44,299 (+1.1%) | June 30, 2026 |
| 16 | Allspring Global Investments Holdings, LLC | 1.21% | 4.1M | $419.2M | +508,208 (+14.0%) | June 30, 2026 |
| 17 | Madison Asset Management, LLC | 1.11% | 3.8M | $384.8M | −276,657 (−6.8%) | June 30, 2026 |
| 18 | Royal Bank of Canada | 1.02% | 3.5M | $354.0M | −36,673 (−1.0%) | June 30, 2026 |
| 19 | Marshfield Associates | 0.98% | 3.3M | $337.3M | +279,714 (+9.2%) | June 30, 2026 |
| 20 | Legal & General Group PLC | 0.91% | 3.1M | $316.0M | −167,788 (−5.1%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 8 holders added 4.6M shares and 12 cut 5.2M.
ACGL top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Artisan International Value Investor | 4.79% | 16.4M | $1.66B | −324,982 (−1.9%) | June 30, 2026 |
| 2 | Vanguard MStar Total Stk Mkt Idx Invest | 3.09% | 10.5M | $1.07B | −22,408 (−0.2%) | August 31, 2026 |
| 3 | Vanguard 500 Index Investor | 2.71% | 9.2M | $935.9M | +110,019 (+1.2%) | August 31, 2026 |
| 4 | Vanguard MStar Mid Cap Index Instl | 2.10% | 7.2M | $727.1M | −3,817 (−0.1%) | August 31, 2026 |
| 5 | Baron Partners Retail | 1.80% | 6.1M | $621.1M | −359,075 (−5.5%) | September 30, 2026 |
| 6 | iShares Core S&P 500 ETF | 1.33% | 4.5M | $458.6M | −7,289 (−0.2%) | September 30, 2026 |
| 7 | Fidelity 500 Index | 1.32% | 4.5M | $457.4M | +17,339 (+0.4%) | August 31, 2026 |
| 8 | State Street® SPDR® S&P 500® ETF | 1.22% | 4.2M | $420.6M | — | September 30, 2026 |
| 9 | Baron Generational Growth Retail | 1.16% | 4.0M | $402.4M | −732,374 (−15.6%) | September 30, 2026 |
| 10 | Allspring Special Mid Cap Value Inst | 1.04% | 3.6M | $360.9M | — | September 30, 2026 |
| 11 | Vanguard MStar Value Index Investor | 0.93% | 3.2M | $320.9M | +7,437 (+0.2%) | August 31, 2026 |
| 12 | Polar Capital Global Ins A Inc | 0.86% | 2.9M | $297.2M | — | August 31, 2026 |
| 13 | State Street®FinSelSectSPDR®ETF | 0.67% | 2.3M | $233.0M | −14,641 (−0.6%) | September 30, 2026 |
| 14 | Vanguard MStar Mid Cap Value ETF | 0.63% | 2.1M | $217.6M | +12,104 (+0.6%) | August 31, 2026 |
| 15 | Invesco S&P 500® Equal Weight ETF | 0.60% | 2.0M | $206.1M | −4,180 (−0.2%) | September 30, 2026 |
| 16 | Vanguard Institutional Index I | 0.55% | 1.9M | $188.4M | −19,002 (−1.0%) | August 31, 2026 |
| 17 | Principal MidCap R5 | 0.45% | 1.5M | $154.3M | −19,337 (−1.3%) | August 31, 2026 |
| 18 | Baron Asset Retail | 0.42% | 1.4M | $146.7M | −50,000 (−3.3%) | September 30, 2026 |
| 19 | JHancock Disciplined Value Mid Cap I | 0.42% | 1.4M | $145.4M | −22,556 (−1.5%) | August 31, 2026 |
| 20 | iShares Russell Mid-Cap ETF | 0.40% | 1.4M | $139.2M | +2,527 (+0.2%) | September 30, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
ACGL insider transactions
latest 20| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-03-11 | Brian S Posner | Sell | $17.11 | 3,000 | $51,330 |
| 2026-03-10 | David Gansberg | Sell | $96.37 | 5,907 | $569,258 |
| 2026-03-10 | Nicolas Papadopoulo | Sell | $96.31 | 21,930 | $2.1M |
| 2026-03-10 | Ro Khanna | Sell | $96.19 | — | — |
| 2026-02-11 | Maamoun Rajeh | Sell | $96.12 | 47,430 | $4.6M |
| 2026-01-23 | Ro Khanna | Buy | $92.96 | — | — |
| 2025-12-15 | John M Pasquesi | Sell | $94.17 | 8,800 | $828,696 |
| 2025-12-12 | John M Pasquesi | Sell | $93.90 | 203,866 | $19.1M |
| 2025-11-28 | Francois Morin | Sell | $94.62 | 8,000 | $756,960 |
| 2025-11-03 | Ro Khanna | Sell | $86.00 | — | — |
| 2025-09-29 | Ro Khanna | Buy | $89.83 | — | — |
| 2025-08-22 | Maamoun Rajeh | Sell | $94.15 | 10,000 | $941,500 |
| 2025-08-04 | Ro Khanna | Buy | $88.51 | — | — |
| 2025-08-01 | Brian S Posner | Buy | $17.34 | 1,000 | $17,340 |
| 2025-07-25 | Ro Khanna | Sell | $88.89 | — | — |
| 2025-07-01 | Ro Khanna | Sell | $91.50 | — | — |
| 2025-05-16 | Francois Morin | Sell | $94.58 | 12,630 | $1.2M |
| 2025-05-12 | John M Pasquesi | Sell | $94.01 | 75,060 | $7.1M |
| 2025-05-12 | Jefferson Shreve | Sell | $94.63 | — | — |
| 2025-05-09 | Louis T Petrillo | Sell | $94.53 | 16,650 | $1.6M |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
ACGL shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns ACGL
Institutional investors own 94.1% of Arch Capital's shares and insiders 2.79%. The largest holder is BlackRock Inc with 8.86% of the shares (30.2M), as of June 30, 2026. Among the top 20 institutions, 8 added shares and 12 reduced their stake in the latest filings. Short interest is 2.64% of the float, or 1.74 days of average trading volume. The share count fell 4.2% since 2014.
Related: ACGL analyst forecast, ACGL key metrics. See the ACGL stock overview for the latest quote and news.
ACGL ownership FAQ
Who owns the most Arch Capital stock?
The largest shareholders of Arch Capital are BlackRock Inc (8.86%), Vanguard Capital Management, LLC (6.51%), Artisan Partners Limited Partnership (6.33%), State Street Corp (4.76%), BAMCO Inc (4.65%).
What percentage of Arch Capital is owned by institutions?
Institutions hold 94.1% of Arch Capital's shares outstanding; insiders hold 2.79%.
Which funds own Arch Capital?
The largest fund holders of Arch Capital are Artisan International Value Investor (4.79%), Vanguard MStar Total Stk Mkt Idx Invest (3.09%), Vanguard 500 Index Investor (2.71%), Vanguard MStar Mid Cap Index Instl (2.10%), Baron Partners Retail (1.80%).
What is Arch Capital's short interest?
7.7M shares of Arch Capital were sold short, 2.64% of the float; at the average daily volume it would take 1.74 days to cover.
Are insiders buying or selling Arch Capital?
Of the latest 20 reported insider transactions in Arch Capital (since May 9, 2025), 4 were purchases and 16 were sales.
How many shares of Arch Capital are outstanding?
Arch Capital has 341.2M shares outstanding, of which 326.9M are in the public float.