Company · Ownership research

Magnolia Oil & Gas Corp MGY

CIK 0001698990 · CUSIP 559663109

Insider trading Initial holdings Institutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP 559663109 (MGY), not CUSIP 559663909 (MGY), CUSIP 559663959 (MGY), and does not merge CUSIPs.

This page lists the top 20 of 408 rows by value; the complete set is available through the API.

Some filings reported values in thousands; those figures were scaled ×1,000 to dollars.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	BlackRock, Inc. CIK 2012383 · View history	$931.04M 29,491,149 shares	0.02%	+1.82M(+6.60%)Added	SEC filing ↗ May 13, 2026	▾
02	VANGUARD PORTFOLIO MANAGEMENT LLC CIK 2100121 · Amended · View history	$409.89M 12,983,395 shares	0.02%	—	SEC filing ↗ May 8, 2026	▾
03	AMERICAN CENTURY COMPANIES INC CIK 748054 · View history	$331.78M 10,509,240 shares	0.17%	-520.61K(-4.70%)Reduced	SEC filing ↗ May 15, 2026	▾
04	STATE STREET CORP CIK 93751 · View history	$299.80M 9,496,275 shares	0.01%	+695.47K(+7.90%)Added	SEC filing ↗ May 15, 2026	▾
05	VANGUARD CAPITAL MANAGEMENT LLC CIK 2100119 · Amended · View history	$226.94M 7,188,424 shares	0.01%	—	SEC filing ↗ May 15, 2026	▾
06	DIMENSIONAL FUND ADVISORS LP CIK 354204 · View history	$221.91M 7,028,781 shares	0.05%	+394.42K(+5.90%)Added	SEC filing ↗ May 7, 2026	▾
07	JANUS HENDERSON GROUP PLC CIK 1274173 · Amended · View history	$198.25M 6,279,636 shares	0.09%	+170.17K(+2.80%)Added	SEC filing ↗ May 18, 2026	▾
08	ARROWSTREET CAPITAL, LIMITED PARTNERSHIP CIK 1164508 · View history	$197.75M 6,263,808 shares	0.11%	+5.56M(+790.80%)Added	SEC filing ↗ May 14, 2026	▾
09	T. Rowe Price Investment Management, Inc. CIK 1897612 · View history	$163.97M 5,193,887 shares	0.11%	+1.20M(+30.20%)Added	SEC filing ↗ May 15, 2026	▾
10	NOMURA ASSET MANAGEMENT INTERNATIONAL INC. CIK 921739 · View history	$156.97M 4,972,261 shares	0.27%	+13.04K(+0.30%)Added	SEC filing ↗ May 15, 2026	▾
11	TD Asset Management Inc CIK 1056053 · View history	$156.02M 4,941,979 shares	0.13%	-729.84K(-12.90%)Reduced	SEC filing ↗ May 11, 2026	▾
12	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$143.30M 4,538,112 shares	0.01%	+102.21K(+2.30%)Added	SEC filing ↗ May 15, 2026	▾
13	Epoch Investment Partners, Inc. CIK 1305841 · View history	$134.98M 4,275,509 shares	0.82%	-1.05M(-19.80%)Reduced	SEC filing ↗ May 14, 2026	▾
14	BANK OF AMERICA CORP /DE/ CIK 70858 · View history	$122.41M 3,877,361 shares	0.01%	+659.01K(+20.50%)Added	SEC filing ↗ May 18, 2026	▾
15	Boston Trust Walden Corp CIK 1534866 · View history	$101.90M 3,227,906 shares	0.84%	-940.18K(-22.60%)Reduced	SEC filing ↗ Apr 24, 2026	▾
16	GOLDMAN SACHS GROUP INC CIK 886982 · View history	$98.86M 3,131,348 shares	0.01%	+905.90K(+40.70%)Added	SEC filing ↗ May 15, 2026	▾
17	VICTORY CAPITAL MANAGEMENT INC CIK 1040188 · View history	$97.58M 3,091,053 shares	0.06%	-500.87K(-13.90%)Reduced	SEC filing ↗ May 15, 2026	▾
18	ALLIANCEBERNSTEIN L.P. CIK 1109448 · View history	$97.44M 4,451,242 shares	0.03%	-296.36K(-6.20%)Reduced	SEC filing ↗ May 15, 2026	▾
19	GW&K Investment Management, LLC CIK 1082917 · View history	$97.28M 3,081,264 shares	0.86%	-88.23K(-2.80%)Reduced	SEC filing ↗ May 13, 2026	▾
20	MORGAN STANLEY CIK 895421 · View history	$95.59M 3,027,975 shares	0.01%	+231.03K(+8.30%)Added	SEC filing ↗ May 15, 2026	▾

Showing 20 / 408 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

408

Cancelled or null records excluded

Disclosed shares

203,794,326

Not deduplicated across managers

Disclosed value

$6.39B

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

Magnolia Oil & Gas Corp · Q1 2026

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Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.