MKTX MarketAxess Holdings Inc.
MarketAxess Holdings Inc. (MKTX) Institutional Ownership
What the institutions did with MKTX 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 September 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 |
|---|---|---|
| BANK OF MONTREAL /CAN/ | 1.1M | 20.9% |
| GEODE CAPITAL MANAGEMENT, LLC | 988.6K | 18.9% |
| GUARDCAP ASSET MANAGEMENT Ltd | 503.0K | 9.6% |
| DIMENSIONAL FUND ADVISORS LP | 426.4K | 8.1% |
| CITIGROUP INC | 315.4K | 6.0% |
| Bank of New York Mellon Corp | 229.7K | 4.4% |
| FMR LLC | 174.5K | 3.3% |
| PRINCIPAL FINANCIAL GROUP INC | 167.0K | 3.2% |
| Nuveen, LLC | 150.5K | 2.9% |
| Amundi | 120.3K | 2.3% |
| Alberta Investment Management Corp | 91.1K | 1.7% |
| ProShare Advisors LLC | 89.8K | 1.7% |
| Squarepoint Ops LLC | 64.7K | 1.2% |
| Alpha Omega Wealth Management LLC | 61.1K | 1.2% |
| PICTON MAHONEY ASSET MANAGEMENT | 60.0K | 1.1% |
| ABC ARBITRAGE SA | 46.2K | 0.9% |
| New York Life Investment Management LLC | 30.0K | 0.6% |
| WEALTH ENHANCEMENT ADVISORY SERVICES, LLC | 29.1K | 0.6% |
| NEW YORK STATE TEACHERS RETIREMENT SYSTEM | 27.2K | 0.5% |
| GENEVA CAPITAL MANAGEMENT LLC | 25.8K | 0.5% |
| NUANCE INVESTMENTS, LLC | 25.7K | 0.5% |
| Thrivent Financial for Lutherans | 22.4K | 0.4% |
| COMMONWEALTH EQUITY SERVICES, LLC | 19.9K | 0.4% |
| Illinois Municipal Retirement Fund | 18.2K | 0.3% |
| Creative Planning | 17.0K | 0.3% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| FMR LLC | Reduced | 1.4M | 174.5K | -1.2M |
| CITIGROUP INC | Increased | 64.8K | 315.4K | +250.7K |
| COOKE & BIELER LP | Sold Out | 238.8K | 0 | -238.8K |
| DIMENSIONAL FUND ADVISORS LP | Reduced | 597.9K | 426.4K | -171.5K |
| M&G PLC | Sold Out | 121.3K | 0 | -121.3K |
| EUBEL BRADY & SUTTMAN ASSET MANAGEMENT INC | Sold Out | 114.3K | 0 | -114.3K |
| Alberta Investment Management Corp | New | 0 | 91.1K | +91.1K |
| Amundi | Increased | 29.4K | 120.3K | +90.9K |
| ProShare Advisors LLC | New | 0 | 89.8K | +89.8K |
| BANK OF MONTREAL /CAN/ | Increased | 1.0M | 1.1M | +75.8K |
| FLOSSBACH VON STORCH SE | Sold Out | 75.0K | 0 | -75.0K |
| PICTON MAHONEY ASSET MANAGEMENT | New | 0 | 60.0K | +60.0K |
| Y-Intercept (Hong Kong) Ltd | Sold Out | 54.8K | 0 | -54.8K |
| ABC ARBITRAGE SA | New | 0 | 46.2K | +46.2K |
| WILSON ASSET MANAGEMENT (INTERNATIONAL) PTY LTD | Sold Out | 45.0K | 0 | -45.0K |
| GUARDCAP ASSET MANAGEMENT Ltd | Reduced | 536.3K | 503.0K | -33.3K |
| Squarepoint Ops LLC | Increased | 32.5K | 64.7K | +32.2K |
| Assenagon Asset Management S.A. | Sold Out | 30.7K | 0 | -30.7K |
| Bank of New York Mellon Corp | Reduced | 257.6K | 229.7K | -27.9K |
| NUANCE INVESTMENTS, LLC | New | 0 | 25.7K | +25.7K |
| New York Life Investment Management LLC | Increased | 4.5K | 30.0K | +25.6K |
| AGF MANAGEMENT LTD | Sold Out | 21.7K | 0 | -21.7K |
| COMMONWEALTH EQUITY SERVICES, LLC | New | 0 | 19.9K | +19.9K |
| BARCLAYS PLC | Reduced | 21.5K | 1.8K | -19.7K |
| CenterBook Partners LP | Sold Out | 17.3K | 0 | -17.3K |
| Bahl & Gaynor LLC | Reduced | 31.7K | 16.5K | -15.2K |
| TOKIO MARINE ASSET MANAGEMENT CO LTD | New | 0 | 15.0K | +15.0K |
| ALPS ADVISORS INC | Reduced | 29.8K | 15.1K | -14.7K |
| EXCHANGE TRADED CONCEPTS, LLC | Reduced | 13.4K | 164 | -13.2K |
| WOLVERINE ASSET MANAGEMENT LLC | New | 0 | 12.2K | +12.2K |
| Universal- Beteiligungs- und Servicegesellschaft mbH | Reduced | 15.6K | 5.7K | -9.9K |
| Fideuram Asset Management (Ireland) dac | Reduced | 25.5K | 15.6K | -9.9K |
| INTECH INVESTMENT MANAGEMENT LLC | Reduced | 17.4K | 7.9K | -9.5K |
| Savant Capital, LLC | New | 0 | 9.5K | +9.5K |
| Oak Thistle LLC | New | 0 | 9.0K | +9.0K |
| WALLED LAKE PLANNING & WEALTH MANAGEMENT, LLC | Increased | 3.1K | 11.3K | +8.2K |
| Thrivent Financial for Lutherans | Reduced | 29.7K | 22.4K | -7.2K |
| Russell Investments Group, Ltd. | Reduced | 15.7K | 8.8K | -7.0K |
| PRINCIPAL FINANCIAL GROUP INC | Reduced | 173.3K | 167.0K | -6.3K |
| GEODE CAPITAL MANAGEMENT, LLC | Reduced | 994.8K | 988.6K | -6.2K |
| DekaBank Deutsche Girozentrale | Sold Out | 5.1K | 0 | -5.1K |
| Carlson Capital, L.P. | New | 0 | 5.0K | +5.0K |
| Handelsbanken Fonder AB | Reduced | 10.7K | 5.8K | -5.0K |
| State of Alaska, Department of Revenue | Reduced | 11.7K | 7.3K | -4.4K |
| NORDEA INVESTMENT MANAGEMENT AB | Sold Out | 4.1K | 0 | -4.1K |
| denkapparat Operations GmbH | Increased | 10.6K | 14.6K | +4.1K |
| Illinois Municipal Retirement Fund | Reduced | 22.0K | 18.2K | -3.8K |
| Creative Planning | Reduced | 20.4K | 17.0K | -3.4K |
| NORDEN GROUP LLC | New | 0 | 3.4K | +3.4K |
| Maryland State Retirement & Pension System | Increased | 6.9K | 9.9K | +3.0K |
| VIRGINIA RETIREMENT SYSTEMS ET Al | Sold Out | 2.4K | 0 | -2.4K |
| SIMPLEX TRADING, LLC | Sold Out | 2.3K | 0 | -2.3K |
| Merit Financial Group, LLC | Increased | 3.8K | 6.1K | +2.3K |
| Chicago Partners Investment Group LLC | Reduced | 5.2K | 2.9K | -2.3K |
| Vise Technologies, Inc. | New | 0 | 2.2K | +2.2K |
| Perpetual Ltd | Sold Out | 2.2K | 0 | -2.2K |
| Versor Investments LP | New | 0 | 2.2K | +2.2K |
| BLAIR WILLIAM & CO/IL | Sold Out | 2.1K | 0 | -2.1K |
| HighTower Advisors, LLC | Sold Out | 2.1K | 0 | -2.1K |
| Inspire Investing, LLC | Sold Out | 2.0K | 0 | -2.0K |
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.