Marshall Wace
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Marshall Wace’s Magnolia Oil & Gas MGY Stock Holding History

Marshall Wace’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 		$8.4M Buy
+328,279
New +$9.38M 0.01% 1105
2025
Q3 		– Sell
-63,419
Closed -$1.43M – 3202
2025
Q2 		$1.43M Buy
+63,419
New +$1.4M ﹤0.01% 1704
2024
Q3 		– Sell
-389,235
Closed -$9.86M – 2787
2024
Q2 		$9.86M Buy
389,235
+365,735
+1,556% +$9.33M 0.01% 737
2024
Q1 		$610K Buy
+23,500
New +$515K ﹤0.01% 1858
2022
Q3 		– Sell
-17,000
Closed -$357K – 3622
2022
Q2 		$357K Sell
17,000
-461,935
-96% -$11.5M ﹤0.01% 2955
2022
Q1 		$11.3M Buy
+478,935
New +$10.5M 0.02% 792
2021
Q2 		– Sell
-252,811
Closed -$2.9M – 2898
2021
Q1 		$2.9M Buy
+252,811
New +$2.63M 0.01% 1138
2020
Q4 		– Sell
-105,140
Closed -$543K – 2065
2020
Q3 		$543K Buy
+105,140
New +$655K ﹤0.01% 1220
2020
Q1 		– Sell
-85,414
Closed -$1.07M – 1894
2019
Q4 		$1.07M Buy
+85,414
New +$957K 0.01% 961
2019
Q2 		– Sell
-173,383
Closed -$2.08M – 1646
2019
Q1 		$2.08M Buy
+173,383
New +$2.11M 0.02% 724
2018
Q4 		– Sell
-1,158,992
Closed -$17.4M – 1722
2018
Q3 		$17.4M Buy
1,158,992
+962,142
+489% +$12.6M 0.15% 191
2018
Q2 		$2.14M Hold
196,850
– – 0.03% 414
2018
Q1 		$1.99M Buy
+196,850
New +$1.93M 0.08% 194

Other funds holding MGY

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
American Century Companies
American Century Companies Kansas City, Missouri $226B AUM 44.75% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return
JT
Jupiter Topco New York $245B AUM
Arrowstreet Capital
Arrowstreet Capital Boston, Massachusetts $225B AUM 49.49% 1-Year Est. Return
T. Rowe Price Investment Management
T. Rowe Price Investment Management Baltimore, Maryland $153B AUM 38.14% 1-Year Est. Return
AllianceBernstein
AllianceBernstein Nashville, Tennessee $302B AUM 26.44% 1-Year Est. Return

Marshall Wace's MGY Position: Q2 2026 in Review

Marshall Wace opened a new position in Magnolia Oil & Gas (MGY) in Q2 2026: 328,279 shares worth $8.4M. The stake represents 0.01% of the portfolio and ranks #1105 among its holdings. This is a return to the name: Marshall Wace previously reported a position in MGY as recently as Q2 2025.

Marshall Wace first reported a position in MGY in Q1 2018 and has held it in 13 quarters since. The position peaked at $17.4M in Q3 2018. 408 funds tracked by Wall St. Rank hold MGY as of Q2 2026.

  • Marshall Wace held 328,279 shares of Magnolia Oil & Gas worth $8.4M as of Q2 2026.
  • Magnolia Oil & Gas was a new Marshall Wace position in Q2 2026.
  • Magnolia Oil & Gas made up 0.01% of Marshall Wace's portfolio in Q2 2026, its #1105 holding.
  • Marshall Wace first reported a position in Magnolia Oil & Gas in Q1 2018 and has held it in 13 quarters since.
  • Marshall Wace's Magnolia Oil & Gas position peaked at $17.4M in Q3 2018.
  • 408 funds tracked by Wall St. Rank held Magnolia Oil & Gas as of Q2 2026.

Based on Marshall Wace's 13F filing for Q2 2026, filed 13 Aug 2026.