MGY Magnolia Oil & Gas Corporation
Magnolia Oil & Gas Corporation (MGY) Institutional Ownership
What the institutions did with MGY 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. | 32.0M | 15.5% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 15.3M | 7.5% |
| AMERICAN CENTURY COMPANIES INC | 11.0M | 5.4% |
| STATE STREET CORP | 9.9M | 4.8% |
| VANGUARD CAPITAL MANAGEMENT LLC | 7.7M | 3.7% |
| DIMENSIONAL FUND ADVISORS LP | 7.1M | 3.5% |
| Jupiter Topco LLC | 6.4M | 3.1% |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 5.5M | 2.7% |
| T. Rowe Price Investment Management, Inc. | 5.2M | 2.5% |
| GEODE CAPITAL MANAGEMENT, LLC | 4.8M | 2.3% |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. | 4.3M | 2.1% |
| BANK OF AMERICA CORP /DE/ | 4.3M | 2.1% |
| ALLIANCEBERNSTEIN L.P. | 4.1M | 2.0% |
| TD Asset Management Inc | 3.9M | 1.9% |
| Epoch Investment Partners, Inc. | 3.6M | 1.7% |
| MORGAN STANLEY | 3.4M | 1.7% |
| VICTORY CAPITAL MANAGEMENT INC | 3.0M | 1.5% |
| GW&K Investment Management, LLC | 2.9M | 1.4% |
| SYSTEMATIC FINANCIAL MANAGEMENT LP | 2.8M | 1.4% |
| Allspring Global Investments Holdings, LLC | 2.7M | 1.3% |
| WESTWOOD HOLDINGS GROUP INC | 2.6M | 1.3% |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 2.6M | 1.3% |
| SILVERCREST ASSET MANAGEMENT GROUP LLC | 2.5M | 1.2% |
| GOLDMAN SACHS GROUP INC | 2.4M | 1.2% |
| Boston Trust Walden Corp | 2.4M | 1.2% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| BlackRock, Inc. | Increased | 29.5M | 32.0M | +2.5M |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Increased | 13.0M | 15.3M | +2.4M |
| PRICE T ROWE ASSOCIATES INC /MD/ | Increased | 244.3K | 1.7M | +1.5M |
| WESTWOOD HOLDINGS GROUP INC | Increased | 1.6M | 2.6M | +1.1M |
| FRED ALGER MANAGEMENT, LLC | Reduced | 1.2M | 171.1K | -1.0M |
| TD Asset Management Inc | Reduced | 4.9M | 3.9M | -1.0M |
| Conestoga Capital Advisors, LLC | New | 0 | 935.6K | +935.6K |
| FORT WASHINGTON INVESTMENT ADVISORS INC /OH/ | New | 0 | 870.9K | +870.9K |
| Boston Trust Walden Corp | Reduced | 3.2M | 2.4M | -843.1K |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC | Reduced | 983.9K | 155.1K | -828.8K |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | Reduced | 6.3M | 5.5M | -800.3K |
| GOLDMAN SACHS GROUP INC | Reduced | 3.1M | 2.4M | -725.2K |
| Epoch Investment Partners, Inc. | Reduced | 4.3M | 3.6M | -705.5K |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. | Reduced | 5.0M | 4.3M | -660.3K |
| SIR Capital Management, L.P. | Reduced | 851.1K | 227.7K | -623.4K |
| HRT FINANCIAL LP | Increased | 273.4K | 787.7K | +514.3K |
| AMERICAN CENTURY COMPANIES INC | Increased | 10.5M | 11.0M | +502.2K |
| VANGUARD CAPITAL MANAGEMENT LLC | Increased | 7.2M | 7.7M | +474.8K |
| STATE STREET CORP | Increased | 9.5M | 9.9M | +445.2K |
| PRINCIPAL FINANCIAL GROUP INC | Reduced | 1.5M | 1.1M | -423.5K |
| RENAISSANCE TECHNOLOGIES LLC | Reduced | 1.7M | 1.3M | -404.9K |
| MORGAN STANLEY | Increased | 3.0M | 3.4M | +401.5K |
| NEUBERGER BERMAN GROUP LLC | Reduced | 418.2K | 25.6K | -392.6K |
| BANK OF AMERICA CORP /DE/ | Increased | 3.9M | 4.3M | +376.0K |
| CITADEL ADVISORS LLC | Sold Out | 364.2K | 0 | -364.2K |
| MILLENNIUM MANAGEMENT LLC | Reduced | 599.0K | 261.4K | -337.6K |
| UBS Group AG | Increased | 1.2M | 1.5M | +333.7K |
| ALLIANCEBERNSTEIN L.P. | Reduced | 4.5M | 4.1M | -328.8K |
| MARSHALL WACE, LLP | New | 0 | 328.3K | +328.3K |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE | Increased | 1.5M | 1.9M | +322.8K |
| Point72 Asset Management, L.P. | Reduced | 692.6K | 385.6K | -307.0K |
| TWO SIGMA INVESTMENTS, LP | Reduced | 1.7M | 1.4M | -277.1K |
| JPMORGAN CHASE & CO | Reduced | 1.2M | 926.7K | -273.8K |
| JANE STREET GROUP, LLC | Reduced | 277.8K | 8.3K | -269.4K |
| GEODE CAPITAL MANAGEMENT, LLC | Increased | 4.5M | 4.8M | +264.9K |
| Campbell & CO Investment Adviser LLC | Sold Out | 237.4K | 0 | -237.4K |
| NORTHERN TRUST CORP | Reduced | 2.1M | 1.9M | -237.1K |
| Creative Planning | Increased | 430.6K | 633.4K | +202.8K |
| FEDERATED HERMES, INC. | Increased | 15.1K | 216.2K | +201.0K |
| Connor, Clark & Lunn Investment Management Ltd. | Reduced | 249.3K | 57.0K | -192.3K |
| Aberdeen Group plc | Increased | 768.1K | 958.9K | +190.9K |
| Aventail Capital Group, LP | New | 0 | 187.6K | +187.6K |
| BNP PARIBAS FINANCIAL MARKETS | Reduced | 251.4K | 65.6K | -185.9K |
| SEI INVESTMENTS CO | Reduced | 455.4K | 273.6K | -181.8K |
| Trexquant Investment LP | Increased | 258.6K | 422.7K | +164.1K |
| GW&K Investment Management, LLC | Reduced | 3.1M | 2.9M | -163.8K |
| LAZARD ASSET MANAGEMENT LLC | New | 0 | 163.3K | +163.3K |
| Foster Victor Wealth Advisors, LLC | Reduced | 424.3K | 265.3K | -159.0K |
| Y-Intercept (Hong Kong) Ltd | Sold Out | 153.4K | 0 | -153.4K |
| SEVEN GRAND MANAGERS, LLC | Sold Out | 150.0K | 0 | -150.0K |
| VAN ECK ASSOCIATES CORP | New | 0 | 149.7K | +149.7K |
| VANGUARD FIDUCIARY TRUST CO | Increased | 1.2M | 1.3M | +148.6K |
| FIRST TRUST ADVISORS LP | Reduced | 976.4K | 830.7K | -145.7K |
| DIAMOND HILL CAPITAL MANAGEMENT INC | Increased | 325.0K | 468.7K | +143.7K |
| Informed Momentum Co LLC | Sold Out | 139.0K | 0 | -139.0K |
| BARROW HANLEY MEWHINNEY & STRAUSS LLC | Increased | 381.9K | 516.0K | +134.1K |
| SILVERCREST ASSET MANAGEMENT GROUP LLC | Reduced | 2.7M | 2.5M | -129.3K |
| Edgestream Partners, L.P. | Increased | 353.0K | 478.7K | +125.7K |
| Qsemble Capital Management, LP | Sold Out | 121.7K | 0 | -121.7K |
| Man Group plc | Reduced | 204.3K | 89.6K | -114.8K |
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.