Jane Street
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Jane Street’s Magnite MGNI Stock Holding History

Jane Street’s Portfolio MGNI Stock Details MGNI Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$2.49M Buy
131,100
+38,800
+42% +$556K ﹤0.01% 4796
2026
Q1 		$1.1M Sell
92,300
-38,200
-29% -$512K ﹤0.01% 6298
2025
Q4 		$2.12M Buy
130,500
+2,200
+2% +$36.5K ﹤0.01% 4705
2025
Q3 		$2.79M Buy
128,300
+75,600
+143% +$1.79M ﹤0.01% 4344
2025
Q2 		$1.27M Sell
52,700
-6,700
-11% -$98.7K ﹤0.01% 5181
2025
Q1 		$678K Sell
59,400
-17,500
-23% -$279K ﹤0.01% 6305
2024
Q4 		$1.22M Buy
76,900
+24,300
+46% +$357K ﹤0.01% 4997
2024
Q3 		$729K Buy
52,600
+18,300
+53% +$249K ﹤0.01% 6537
2024
Q2 		$456K Buy
+34,300
New +$375K ﹤0.01% 7178
2024
Q1 		– Sell
-21,700
Closed -$203K – 9737
2023
Q4 		$203K Sell
21,700
-7,400
-25% -$58.5K ﹤0.01% 8200
2023
Q3 		$219K Buy
29,100
+13,200
+83% +$142K ﹤0.01% 7500
2023
Q2 		$217K Sell
15,900
-600
-4% -$6.68K ﹤0.01% 7591
2023
Q1 		$153K Sell
16,500
-20,700
-56% -$221K ﹤0.01% 8000
2022
Q4 		$394K Buy
37,200
+12,900
+53% +$118K ﹤0.01% 6557
2022
Q3 		$160K Sell
24,300
-40,200
-62% -$323K ﹤0.01% 8354
2022
Q2 		$573K Sell
64,500
-30,100
-32% -$323K ﹤0.01% 6483
2022
Q1 		$1.25M Sell
94,600
-21,200
-18% -$286K ﹤0.01% 5663
2021
Q4 		$2.03M Buy
115,800
+1,800
+2% +$40.6K ﹤0.01% 4467
2021
Q3 		$3.19M Sell
114,000
-54,100
-32% -$1.63M ﹤0.01% 3542
2021
Q2 		$5.69M Sell
168,100
-89,000
-35% -$3.02M ﹤0.01% 2452
2021
Q1 		$10.7M Buy
257,100
+60,100
+31% +$2.6M 0.01% 1480
2020
Q4 		$6.05M Buy
197,000
+116,700
+145% +$1.77M ﹤0.01% 1908
2020
Q3 		$558K Buy
+80,300
New +$537K ﹤0.01% 4984

Other funds holding MGNI

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Wellington Management Group
Wellington Management Group Boston, Massachusetts $580B AUM 38.23% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return
Boston Partners
Boston Partners Boston, Massachusetts $113B AUM 38.87% 1-Year Est. Return
American Century Companies
American Century Companies Kansas City, Missouri $226B AUM 44.75% 1-Year Est. Return
Capital Research Global Investors
Capital Research Global Investors Los Angeles, California $717B AUM 35.42% 1-Year Est. Return
Nuveen
Nuveen Charlotte, North Carolina $419B AUM 43.02% 1-Year Est. Return

Jane Street's MGNI Position: Q2 2026 in Review

Jane Street increased its Magnite (MGNI) stake by 32% in Q2 2026, buying an estimated $7.61M and bringing the position to 2,199,191 shares worth $41.7M. The position accounts for ﹤0.01% of the portfolio, ranked #1566.

Jane Street first reported a position in MGNI in Q1 2016 and has held it in 29 quarters since. 310 funds tracked by Wall St. Rank hold MGNI as of Q2 2026.

  • Jane Street held 2,199,191 shares of Magnite worth $41.7M as of Q2 2026.
  • Jane Street bought 531,031 Magnite shares in Q2 2026, an estimated $7.61M.
  • Magnite made up ﹤0.01% of Jane Street's portfolio in Q2 2026, its #1566 holding.
  • Jane Street first reported a position in Magnite in Q1 2016 and has held it in 29 quarters since.
  • 310 funds tracked by Wall St. Rank held Magnite as of Q2 2026.

Based on Jane Street's 13F filing for Q2 2026, filed 14 Aug 2026.