Heartland Advisors’s Magnolia Oil & Gas MGY Stock Holding History

Heartland Advisors’s Portfolio MGY Stock Details MGY Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q2	$15.7M	Sell	615,475 -15,000	-2%	-$428K	0.7%	39
2026 Q1	$19.9M	Sell	630,475 -20,774	-3%	-$556K	1.02%	18
2025 Q4	$14.3M	Buy	651,249 +74,959	+13%	+$1.7M	0.77%	39
2025 Q3	$13.8M	Buy	576,290 +276,290	+92%	+$6.59M	0.73%	43
2025 Q2	$6.74M	Hold	300,000	–	–	0.38%	112
2025 Q1	$7.58M	Hold	300,000	–	–	0.44%	97
2024 Q4	$7.01M	Hold	300,000	–	–	0.38%	107
2024 Q3	$7.33M	Hold	300,000	–	–	0.38%	108
2024 Q2	$7.6M	Hold	300,000	–	–	0.43%	92
2024 Q1	$7.79M	Buy	+300,000	New	+$6.58M	0.41%	99

Other funds holding MGY

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

American Century Companies Kansas City, Missouri $226B AUM 44.75% 1-Year Est. Return

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return

Jupiter Topco New York $245B AUM

Arrowstreet Capital Boston, Massachusetts $225B AUM 49.49% 1-Year Est. Return

T. Rowe Price Investment Management Baltimore, Maryland $153B AUM 38.14% 1-Year Est. Return

AllianceBernstein Nashville, Tennessee $302B AUM 26.44% 1-Year Est. Return

Heartland Advisors's MGY Position: Q2 2026 in Review

Heartland Advisors reduced its Magnolia Oil & Gas (MGY) stake by 2.4% in Q2 2026, selling an estimated $428K and leaving 615,475 shares worth $15.7M. The position accounts for 0.7% of the portfolio, ranked #39.

Heartland Advisors first reported a position in MGY in Q1 2024 and has held it in 10 quarters since. The position peaked at $19.9M in Q1 2026. 410 funds tracked by Wall St. Rank hold MGY as of Q2 2026.

Heartland Advisors held 615,475 shares of Magnolia Oil & Gas worth $15.7M as of Q2 2026.
Heartland Advisors sold 15,000 Magnolia Oil & Gas shares in Q2 2026, an estimated $428K.
Magnolia Oil & Gas made up 0.7% of Heartland Advisors's portfolio in Q2 2026, its #39 holding.
Heartland Advisors first reported a position in Magnolia Oil & Gas in Q1 2024 and has held it in 10 quarters since.
Heartland Advisors's Magnolia Oil & Gas position peaked at $19.9M in Q1 2026.
410 funds tracked by Wall St. Rank held Magnolia Oil & Gas as of Q2 2026.

Based on Heartland Advisors's 13F filing for Q2 2026, filed 11 Aug 2026.