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MGY · Magnolia Oil & Gas Corp

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Market Cap
$6.45B
Shares
236.97M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 412
Total Value: $5,261,238,811
Total Shares: 205,677,898
Showing 1–100 of 417 holdings by value · page 1 of 5

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 412 13F filers · Δ vs Mar 31, 2026
Top Holder
15.5%
Sep 2023 → Jun 2026 · range 9.3% – 15.5%
+1.1 pts
Top 5
36.9%
Sep 2023 → Jun 2026 · range 31.7% – 38.5%
+2.8 pts
Top 10
51.0%
Sep 2023 → Jun 2026 · range 47.4% – 53.4%
+2.3 pts
HHI
453
Sep 2023 → Jun 2026 · range 356 – 453
Broadly held+44

Quarterly Activity

vs Mar 31, 2026
New
59
Increased
163
Decreased
142
Sold Out
53
Unchanged
48
Holder count: +6
Institutional value: -18.3%
Shares held: +0.8%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 417
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 1698990 CUSIP 559663109 13F (30d) 283 filings 281 filers Visit website Investor relations