Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in MGY held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 29.5M | $931.0M | +6.6% | 15.885% | 0.02% |
| 2 | VANGUARD PORTFOLIO MANAGEMENT LLC | 13.0M | $409.9M | — | 6.993% | 0.02% |
| 3 | AMERICAN CENTURY COMPANIES INC | 10.5M | $331.8M | -4.7% | 5.661% | 0.17% |
| 4 | STATE STREET CORP | 9.5M | $299.8M | +7.9% | 5.115% | 0.01% |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | 7.2M | $226.9M | — | 3.872% | 0.01% |
| 6 | DIMENSIONAL FUND ADVISORS LP | 7.0M | $221.9M | +5.9% | 3.786% | 0.05% |
| 7 | JANUS HENDERSON GROUP PLC | 6.3M | $198.2M | +2.8% | 3.382% | 0.10% |
| 8 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 6.3M | $197.7M | +790.8% | 3.374% | 0.11% |
| 9 | NOMURA ASSET MANAGEMENT INTERNATIONAL INC. | 5.0M | $157.0M | +0.3% | 2.678% | 0.27% |
| 10 | TD ASSET MANAGEMENT INC | 4.9M | $156.0M | -12.9% | 2.662% | 0.13% |
| 11 | GEODE CAPITAL MANAGEMENT, LLC | 4.5M | $143.3M | +2.3% | 2.444% | 0.01% |
| 12 | Epoch Investment Partners, Inc. | 4.3M | $135.0M | -19.8% | 2.303% | 0.82% |
| 13 | BANK OF AMERICA CORP /DE/ | 3.9M | $122.4M | +20.5% | 2.089% | 0.01% |
| 14 | Boston Trust Walden Corp | 3.2M | $101.9M | -22.6% | 1.739% | 0.84% |
| 15 | GOLDMAN SACHS GROUP INC | 3.1M | $98.9M | +40.7% | 1.687% | 0.01% |
| 16 | VICTORY CAPITAL MANAGEMENT INC | 3.1M | $97.6M | -13.9% | 1.665% | 0.06% |
| 17 | ALLIANCEBERNSTEIN L.P. | 4.5M | $97.4M | -6.2% | 2.398% | 0.03% |
| 18 | MORGAN STANLEY | 3.0M | $95.6M | +8.3% | 1.631% | 0.01% |
| 19 | SYSTEMATIC FINANCIAL MANAGEMENT LP | 2.8M | $88.8M | -4.3% | 1.515% | 2.04% |
| 20 | SILVERCREST ASSET MANAGEMENT GROUP LLC | 2.7M | $84.2M | -20.0% | 1.436% | 0.61% |
| 21 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 2.6M | $82.5M | +4.8% | 1.408% | 0.01% |
| 22 | Allspring Global Investments Holdings, LLC | 2.7M | $81.4M | -7.9% | 1.454% | 0.14% |
| 23 | Nuveen, LLC | 2.3M | $71.1M | +23.8% | 1.214% | 0.02% |
| 24 | LOOMIS SAYLES & CO L P | 2.2M | $68.8M | -6.0% | 1.174% | 0.09% |
| 25 | Stephens Investment Management Group LLC | 2.2M | $68.6M | +0.8% | 1.170% | 0.94% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in MGY — a direct measure of their conviction.
Filings activity in MGY during Q1 2026, grouped by how each filer changed its position.
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 390 | +4.8% | 116.06% | +35.39 pp | $5.95B | +44% |
| Q4 2025 | 372 | +1.9% | 80.67% | 10.56 pp | $4.14B | 12% |
| Q3 2025 | 365 | 4.7% | 91.23% | +2.07 pp | $4.68B | +2.3% |
| Q2 2025 | 383 | 4.0% | 89.16% | 11.45 pp | $4.57B | 11% |
| Q1 2025 | 399 | +6.4% | 100.61% | +9.47 pp | $5.16B | +10% |
| Q4 2024 | 375 | +4.5% | 91.14% | 5.46 pp | $4.67B | 5.7% |
| Q3 2024 | 359 | +6.5% | 96.60% | 19.64 pp | $4.95B | 17% |
| Q2 2024 | 337 | — | 116.24% | — | $5.96B | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying MGY stock.
Based on Q1 2026 13F filings, institutional ownership of Magnolia Oil & Gas Corporation stands at 116.1%, held across 390 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of MGY, with approximately 29,491,149 shares worth $0.93B as of Q1 2026.
No marquee "smart money" managers (Berkshire, Burry, ARK, Tiger Global, Pershing Square, Baupost, etc.) currently appear among the top 25 institutional holders of MGY.
Our composite Smart Money Score for MGY is 49 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
75 institutions opened new positions in MGY during Q1 2026, while 57 fully exited. 275 added to existing positions and 39 trimmed.
MGY institutional ownership rose by 35.39 percentage points quarter-over-quarter, with a net change of +18 holders.
The top 10 institutions account for 52.6% of all reported 13F value in MGY, and the top 25 account for 76.8%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Magnolia Oil & Gas Corporation (MGY) Institutional Ownership