MAGNOLIA OIL & GAS CORP - A (MGY) Institutional Shareholders
MAGNOLIA OIL & GAS CORP - A (MGY) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended March 31, 2026. The institutional investors covered on this page collectively reported approximately $5.94B in MGY holdings during the latest filing period.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of MGY tracked by InsiderSet, reporting ownership valued at approximately $931.04M in its March 31, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $758.22M, representing an estimated loss of -18.56% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 53% of the total disclosed MGY value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Vanguard Portfolio Management Llc, American Century Companies Inc, and several other long-term asset managers with concentrated positions in MAGNOLIA OIL & GAS CORP - A (MGY).
This page ranks the largest institutional MGY shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
400
Total Reported Value
$5.94B
Largest Holder
Blackrock, Inc.
Largest Position
$931.04M
Insider Transactions (90d)
2
Latest Filing Quarter
Q2 2026
New Institutional Positions
73
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.02% | 29,491,149 | $931,035,564 | $758,217,441 | -$172,818,123 | -18.56% | |
| Vanguard Portfolio Management Llc | 0.02% | 12,983,395 | $409,885,780 | $333,803,085 | -$76,082,695 | -18.56% | |
| American Century Companies Inc | 0.17% | 10,509,240 | $331,776,745 | $270,192,560 | -$61,584,185 | -18.56% | |
| State Street Corp | 0.01% | 9,496,275 | $299,797,402 | $244,149,230 | -$55,648,172 | -18.56% | |
| Vanguard Capital Management Llc | 0.01% | 7,188,424 | $226,938,546 | $184,814,381 | -$42,124,165 | -18.56% | |
| Dimensional Fund Advisors Lp | 0.05% | 7,028,781 | $221,910,425 | $180,709,960 | -$41,200,465 | -18.57% | |
| Janus Henderson Group Plc | 0.10% | 6,279,636 | $198,247,716 | $161,449,442 | -$36,798,274 | -18.56% | |
| Arrowstreet Capital, Limited Partnership | 0.11% | 6,263,808 | $197,748,419 | $161,042,504 | -$36,705,915 | -18.56% | |
| Nomura Asset Management International Inc. | 0.27% | 4,972,261 | $156,974,000 | $127,836,830 | -$29,137,170 | -18.56% | |
| Td Asset Management Inc | 0.13% | 4,941,979 | $156,018,277 | $127,058,280 | -$28,959,997 | -18.56% | |
| Geode Capital Management, Llc | 0.01% | 4,538,112 | $143,303,408 | $116,674,860 | -$26,628,548 | -18.58% | |
| Epoch Investment Partners, Inc. | 0.82% | 4,275,509 | $134,977,819 | $109,923,336 | -$25,054,483 | -18.56% | |
| Bank Of America Corp | 0.01% | 3,877,361 | $122,408,283 | $99,686,951 | -$22,721,332 | -18.56% | |
| Goldman Sachs Group Inc | 0.01% | 3,131,348 | $98,856,642 | $80,506,957 | -$18,349,685 | -18.56% | |
| Victory Capital Management Inc | 0.06% | 3,091,053 | $97,584,544 | $79,470,973 | -$18,113,571 | -18.56% | |
| Alliancebernstein L.P. | 0.03% | 4,451,242 | $97,437,687 | $114,441,432 | +$17,003,745 | +17.45% | |
| Morgan Stanley | 0.01% | 3,027,975 | $95,593,190 | $77,849,237 | -$17,743,953 | -18.56% | |
| Systematic Financial Management Lp | 2.04% | 2,813,278 | $88,815,210 | $72,329,377 | -$16,485,833 | -18.56% | |
| Silvercrest Asset Management Group Llc | 0.61% | 2,666,648 | $84,186,142 | $68,559,520 | -$15,626,622 | -18.56% | |
| Charles Schwab Investment Management Inc | 0.01% | 2,613,478 | $82,507,500 | $67,192,519 | -$15,314,981 | -18.56% | |
| Allspring Global Investments Holdings, Llc | 0.14% | 2,699,004 | $81,428,956 | $69,391,393 | -$12,037,563 | -14.78% | |
| Nuveen, Llc | 0.02% | 2,253,068 | $71,129,356 | $57,926,378 | -$13,202,978 | -18.56% | |
| Loomis Sayles & Co L P | 0.09% | 2,179,644 | $68,811,361 | $56,038,647 | -$12,772,714 | -18.56% | |
| Northern Trust Corp | 0.01% | 2,132,100 | $67,310,396 | $54,816,291 | -$12,494,105 | -18.56% | |
| Bank Of New York Mellon Corp | 0.01% | 1,943,586 | $61,358,998 | $49,969,596 | -$11,389,402 | -18.56% | |
| Boston Trust Walden Corp | 0.46% | 2,384,760 | $61,002,161 | $61,312,180 | +$310,019 | +0.51% | |
| Stephens Investment Management Group Llc | 0.61% | 2,219,966 | $56,786,730 | $57,075,326 | +$288,596 | +0.51% | |
| Renaissance Technologies LLC | Jim Simons | 0.08% | 1,701,802 | $53,725,889 | $43,753,329 | -$9,972,560 | -18.56% |
| Two Sigma Investments, Lp | 0.04% | 1,693,795 | $53,473,108 | $43,547,469 | -$9,925,639 | -18.56% | |
| Westwood Holdings Group Inc | 0.37% | 1,590,570 | $50,214,294 | $40,893,555 | -$9,320,739 | -18.56% | |
| Principal Financial Group Inc | 0.03% | 1,544,274 | $48,752,478 | $39,703,285 | -$9,049,193 | -18.56% | |
| Manufacturers Life Insurance Company, The | 0.04% | 1,534,372 | $48,440,124 | $39,448,704 | -$8,991,420 | -18.56% | |
| Fred Alger Management, Llc | 0.17% | 1,195,380 | $37,738,147 | $30,733,220 | -$7,004,927 | -18.56% | |
| Vanguard Fiduciary Trust Co | 0.01% | 1,181,924 | $37,313,341 | $30,387,266 | -$6,926,075 | -18.56% | |
| Ubs Group Ag | 0.01% | 1,170,209 | $36,943,499 | $30,086,073 | -$6,857,426 | -18.56% | |
| Voloridge Investment Management, Llc | 0.12% | 983,876 | $31,060,965 | $25,295,452 | -$5,765,513 | -18.56% | |
| First Trust Advisors Lp | 0.02% | 976,356 | $30,823,558 | $25,102,113 | -$5,721,445 | -18.56% | |
| Sir Capital Management, L.P. | 2.51% | 851,094 | $26,869,038 | $21,881,627 | -$4,987,411 | -18.56% | |
| Public Sector Pension Investment Board | 0.08% | 801,757 | $25,311,468 | $20,613,172 | -$4,698,296 | -18.56% | |
| Aberdeen Group Plc | 0.03% | 958,945 | $24,529,813 | $24,654,476 | +$124,663 | +0.51% | |
| Conestoga Capital Advisors, Llc | 0.52% | 935,605 | $23,932,776 | $24,054,405 | +$121,629 | +0.51% | |
| Fort Washington Investment Advisors Inc | 0.11% | 870,898 | $22,277,571 | $22,390,788 | +$113,217 | +0.51% | |
| Invesco Ltd. | 0.00% | 704,724 | $22,248,137 | $18,118,454 | -$4,129,683 | -18.56% | |
| Point72 Asset Management, L.P. | 0.04% | 692,589 | $21,865,035 | $17,806,463 | -$4,058,572 | -18.56% | |
| Heartland Advisors Inc | 1.02% | 630,475 | $19,904,096 | $16,209,512 | -$3,694,584 | -18.56% | |
| Millennium Management Llc | 0.01% | 599,017 | $18,910,967 | $15,400,727 | -$3,510,240 | -18.56% | |
| Rhumbline Advisers | 0.02% | 577,269 | $18,224,359 | $14,841,586 | -$3,382,773 | -18.56% | |
| Aqr Capital Management Llc | 0.01% | 497,885 | $15,718,225 | $12,800,623 | -$2,917,602 | -18.56% | |
| Gilder Gagnon Howe & Co Llc | 0.18% | 486,526 | $15,359,636 | $12,508,583 | -$2,851,053 | -18.56% | |
| Sei Investments Co | 0.01% | 455,352 | $14,375,299 | $11,707,100 | -$2,668,199 | -18.56% |
Frequently asked questions about MGY
Who owns the most MGY stock?
The largest holders of MGY are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for MAGNOLIA OIL & GAS CORP - A (MGY).
Is MGY widely held by superinvestors?
Many widely followed stocks like MGY appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly MGY is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.