Magnolia Oil & Gas Corporation
Magnolia Oil & Gas Corporation (MGY) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · MGY · as of Sep 30, 2025
Ownership Breakdown
381
Institutional Holders
▼ 15 vs Q2
$4.92B
Total Inst. Value
▲ $65.78M vs Q2
184.95M
Shares Outstanding
freeFloat 97.94%
206.16M
13F Shares Held
▼ 10.17M vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
MGY largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
BLACKROCK, INC. crude petroleum & natural gas | 27.44M | 14.63% | 14.63% | $655.07B | Nov 12, 2025 | ▼ 125.2K |
VANGUARD GROUP INC crude petroleum & natural gas | 19.88M | 10.60% | 10.60% | $474.44B | Nov 7, 2025 | ▼ 382.1K |
AMERICAN CENTURY COMPANIES INC crude petroleum & natural gas | 11.89M | 6.34% | 6.34% | $283.76B | Nov 12, 2025 | ▲ 26.4K |
STATE STREET CORP crude petroleum & natural gas | 8.68M | 4.62% | 4.62% | $207.07B | Nov 14, 2025 | ▼ 1.12M |
DIMENSIONAL FUND ADVISORS LP crude petroleum & natural gas | 6.37M | 3.40% | 3.40% | $152.05B | Nov 12, 2025 | ▲ 283.4K |
JANUS HENDERSON GROUP PLC crude petroleum & natural gas | 6.36M | 3.39% | 3.39% | $151.70B | Nov 14, 2025 | ▼ 98.9K |
T. ROWE PRICE INVESTMENT MANAGEMENT, INC. crude petroleum & natural gas | 5.58M | 2.97% | 2.97% | $133.11B | Nov 14, 2025 | ▼ 19.5K |
MACQUARIE GROUP LTD crude petroleum & natural gas | 5.38M | 2.87% | 2.87% | $128.46B | Nov 13, 2025 | ▼ 495.4K |
WELLINGTON MANAGEMENT GROUP LLP crude petroleum & natural gas | 5.23M | 2.79% | 2.79% | $124.72B | Nov 14, 2025 | ▲ 113.5K |
ALLIANCEBERNSTEIN L.P. crude petroleum & natural gas | 4.66M | 2.48% | 2.48% | $111.20B | Nov 14, 2025 | ▼ 116.7K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
19
Increased
+7.68M shares0
New Positions
first time holders30
Decreased
−9.44M shares0
Sold Out
fully exitedNet shares change (top 50)
1.77M
+7.68M / −9.44M
Net new holders
-11
0 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
MGY insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
10
Buy transactions
18
Sell transactions
0.56
Buy/Sell ratio
$1M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Acosta Arcilia director | May 8, 2026 | Award | 6,320 | — | — | 134.6K | Form 4 ↗ |
DJEREJIAN EDWARD P director | May 8, 2026 | Award | 6,320 | — | — | 116.7K | Form 4 ↗ |
Ropp Ralph Lewis director | May 8, 2026 | Award | 6,320 | — | — | 21.0K | Form 4 ↗ |
SMITH DAN F director | May 8, 2026 | Award | 8,028 | — | — | 127.2K | Form 4 ↗ |
Khani David M. director | May 8, 2026 | Award | 6,320 | — | — | 22.6K | Form 4 ↗ |
Szabo Shandell director | May 8, 2026 | Award | 6,320 | — | — | 20.6K | Form 4 ↗ |
LARSON JAMES R director | May 8, 2026 | Award | 6,320 | — | — | 97.3K | Form 4 ↗ |
Szabo Shandell director | Mar 30, 2026 | Sale | 11,731 | $31.98 | $375.2K | 14.3K | Form 4 ↗ |
Acosta Arcilia director | Mar 9, 2026 | Sale | 19,235 | $29.10 | $559.8K | 128.2K | Form 4 ↗ |
DJEREJIAN EDWARD P director | Mar 10, 2026 | Sale | 18,000 | $28.98 | $521.6K | 110.4K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Magnolia Oil & Gas Corporation (MGY) is primarily owned by institutional investors, who hold approximately 100.0% of total shares outstanding. Company insiders own approximately 2.06%, while retail and public investors account for the remaining 0.00%.
The largest institutional shareholder of Magnolia Oil & Gas Corporation is BLACKROCK, INC., holding approximately 27.44 million shares — equal to 14.63% of outstanding shares — as of September 30, 2025.
A total of 381 institutional investors currently hold MGY stock, with a combined institutional value of approximately $4.92 billion as of the most recent 13F filing period.
Frequently asked questions
MGY ownershipMagnolia Oil & Gas Corporation (MGY) is primarily owned by institutional investors, who hold approximately 100.0% of shares. The largest shareholder is BLACKROCK, INC. with a 14.63% stake. Company insiders hold 2.06%. Data sourced from SEC Form 13F as of September 30, 2025.