ACGL Arch Capital Group Ltd.
Arch Capital Group Ltd. (ACGL) Institutional Ownership
What the institutions did with ACGL last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
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Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.
Largest holders
| Manager | Shares | % of reported |
|---|---|---|
| BlackRock, Inc. | 30.2M | 9.7% |
| VANGUARD CAPITAL MANAGEMENT LLC | 22.2M | 7.1% |
| Artisan Partners Limited Partnership | 21.6M | 6.9% |
| STATE STREET CORP | 16.3M | 5.2% |
| BAMCO INC /NY/ | 15.9M | 5.1% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 14.5M | 4.6% |
| WCM INVESTMENT MANAGEMENT, LLC | 12.0M | 3.8% |
| GEODE CAPITAL MANAGEMENT, LLC | 10.5M | 3.4% |
| JPMORGAN CHASE & CO | 7.0M | 2.2% |
| Invesco Ltd. | 4.9M | 1.6% |
| NORGES BANK | 4.7M | 1.5% |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 4.5M | 1.4% |
| MORGAN STANLEY | 4.4M | 1.4% |
| NORTHERN TRUST CORP | 4.3M | 1.4% |
| DIMENSIONAL FUND ADVISORS LP | 4.2M | 1.3% |
| Allspring Global Investments Holdings, LLC | 4.1M | 1.3% |
| Madison Asset Management, LLC | 3.8M | 1.2% |
| ROYAL BANK OF CANADA | 3.5M | 1.1% |
| MARSHFIELD ASSOCIATES | 3.3M | 1.1% |
| Legal & General Group Plc | 3.1M | 1.0% |
| GOLDMAN SACHS GROUP INC | 3.0M | 1.0% |
| Polar Capital Holdings Plc | 3.0M | 1.0% |
| PRINCIPAL FINANCIAL GROUP INC | 2.9M | 0.9% |
| High Ground Investment Management LLP | 2.6M | 0.8% |
| NATIXIS ADVISORS, LLC | 2.5M | 0.8% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | Reduced | 3.2M | 90.2K | -3.1M |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | Increased | 1.9M | 4.5M | +2.6M |
| FIRST TRUST ADVISORS LP | Reduced | 2.6M | 442.6K | -2.2M |
| AQR CAPITAL MANAGEMENT LLC | Reduced | 2.7M | 1.4M | -1.4M |
| BlackRock, Inc. | Reduced | 31.4M | 30.2M | -1.1M |
| Egerton Capital (UK) LLP | Sold Out | 1.1M | 0 | -1.1M |
| Artisan Partners Limited Partnership | Reduced | 22.7M | 21.6M | -1.1M |
| Champlain Investment Partners, LLC | Reduced | 1.3M | 370.7K | -891.5K |
| Invesco Ltd. | Increased | 4.1M | 4.9M | +887.7K |
| BAMCO INC /NY/ | Reduced | 16.7M | 15.9M | -837.3K |
| High Ground Investment Management LLP | Increased | 1.8M | 2.6M | +818.5K |
| Clark Capital Management Group, Inc. | Sold Out | 715.5K | 0 | -715.5K |
| JANE STREET GROUP, LLC | Increased | 236.1K | 932.7K | +696.6K |
| WCM INVESTMENT MANAGEMENT, LLC | Reduced | 12.6M | 12.0M | -628.8K |
| DEUTSCHE BANK AG\ | Reduced | 2.0M | 1.4M | -579.1K |
| UBS Group AG | Reduced | 1.9M | 1.4M | -576.0K |
| Qube Research & Technologies Ltd | Sold Out | 561.9K | 0 | -561.9K |
| Capital International Investors | Reduced | 1.4M | 804.7K | -547.2K |
| Allspring Global Investments Holdings, LLC | Increased | 3.6M | 4.1M | +508.2K |
| TWO SIGMA INVESTMENTS, LP | Reduced | 1.3M | 787.2K | -486.5K |
| ANCHOR CAPITAL ADVISORS LLC | Increased | 443.1K | 879.6K | +436.5K |
| AMERICAN CENTURY COMPANIES INC | Increased | 939.4K | 1.4M | +425.5K |
| PRINCIPAL FINANCIAL GROUP INC | Reduced | 3.3M | 2.9M | -405.9K |
| VANGUARD CAPITAL MANAGEMENT LLC | Reduced | 22.6M | 22.2M | -391.2K |
| Clearbridge Investments, LLC | Increased | 345.0K | 704.8K | +359.7K |
| SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC | Increased | 78.5K | 409.7K | +331.2K |
| Caisse de depot et placement du Quebec | New | 0 | 330.4K | +330.4K |
| BNP PARIBAS FINANCIAL MARKETS | Increased | 783.0K | 1.1M | +326.3K |
| Polar Capital Holdings Plc | Reduced | 3.3M | 3.0M | -320.0K |
| Treasurer of the State of North Carolina | Increased | 367.2K | 659.3K | +292.1K |
| NEW YORK STATE COMMON RETIREMENT FUND | Reduced | 668.4K | 386.5K | -282.0K |
| Mariner, LLC | Increased | 212.5K | 493.6K | +281.1K |
| MARSHFIELD ASSOCIATES | Increased | 3.1M | 3.3M | +279.7K |
| Robeco Institutional Asset Management B.V. | Increased | 1.8M | 2.0M | +277.0K |
| Madison Asset Management, LLC | Reduced | 4.1M | 3.8M | -276.7K |
| DIAMANT ASSET MANAGEMENT, INC. | Reduced | 276.0K | 2.9K | -273.1K |
| WEALTH ENHANCEMENT ADVISORY SERVICES, LLC | Increased | 121.0K | 385.9K | +264.9K |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE | Reduced | 427.3K | 168.5K | -258.8K |
| BRANDES INVESTMENT PARTNERS, LP | Reduced | 1.8M | 1.5M | -254.2K |
| BANK OF AMERICA CORP /DE/ | Reduced | 1.7M | 1.5M | -241.0K |
| FIDUCIARY MANAGEMENT INC /WI/ | Reduced | 1.5M | 1.2M | -235.9K |
| United Super Pty Ltd in its capacity as Trustee for the Construction & Building Unions Superannuation Fund | New | 0 | 231.4K | +231.4K |
| BANK OF NOVA SCOTIA | Reduced | 271.1K | 40.5K | -230.6K |
| KBC Group NV | Increased | 304.4K | 529.4K | +225.0K |
| PFA Pension, Forsikringsaktieselskab | Increased | 302.2K | 525.3K | +223.1K |
| FEDERATED HERMES, INC. | Reduced | 411.9K | 191.3K | -220.6K |
| Squarepoint Ops LLC | Increased | 9.5K | 229.1K | +219.6K |
| SEI INVESTMENTS CO | Increased | 1.6M | 1.8M | +218.9K |
| JPMORGAN CHASE & CO | Increased | 6.8M | 7.0M | +209.9K |
| Thrivent Financial for Lutherans | Increased | 1.3M | 1.5M | +193.2K |
| NORTHERN TRUST CORP | Reduced | 4.5M | 4.3M | -191.1K |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Reduced | 14.7M | 14.5M | -185.5K |
| Gladstone Capital Management LLP | Reduced | 482.2K | 306.7K | -175.6K |
| CAPITAL FUND MANAGEMENT S.A. | Increased | 60.5K | 235.7K | +175.2K |
| CITADEL ADVISORS LLC | Increased | 99.2K | 272.3K | +173.1K |
| Prana Capital Management, LP | Sold Out | 169.5K | 0 | -169.5K |
| Legal & General Group Plc | Reduced | 3.3M | 3.1M | -167.8K |
| Public Sector Pension Investment Board | Reduced | 260.7K | 99.4K | -161.3K |
| Weiss Asset Management LP | Increased | 42.3K | 201.5K | +159.2K |
| HSBC HOLDINGS PLC | Increased | 1.3M | 1.4M | +156.4K |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.