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 		$1.11M Buy
58,300
+31,500
+118% +$451K ﹤0.01% 6320
2026
Q1 		$318K Sell
26,800
-193,700
-88% -$2.6M ﹤0.01% 9111
2025
Q4 		$3.58M Sell
220,500
-79,200
-26% -$1.31M ﹤0.01% 3750
2025
Q3 		$6.53M Buy
299,700
+64,700
+28% +$1.53M ﹤0.01% 3012
2025
Q2 		$5.67M Buy
235,000
+42,900
+22% +$632K ﹤0.01% 2836
2025
Q1 		$2.19M Sell
192,100
-151,300
-44% -$2.41M ﹤0.01% 4207
2024
Q4 		$5.47M Buy
343,400
+51,900
+18% +$761K ﹤0.01% 2546
2024
Q3 		$4.04M Sell
291,500
-13,700
-4% -$187K ﹤0.01% 3210
2024
Q2 		$4.06M Buy
305,200
+285,200
+1,426% +$3.12M ﹤0.01% 3302
2024
Q1 		$215K Sell
20,000
-8,500
-30% -$84.9K ﹤0.01% 8090
2023
Q4 		$266K Buy
28,500
+1,700
+6% +$13.4K ﹤0.01% 7793
2023
Q3 		$202K Sell
26,800
-37,800
-59% -$408K ﹤0.01% 7608
2023
Q2 		$882K Sell
64,600
-6,800
-10% -$75.7K ﹤0.01% 5409
2023
Q1 		$661K Sell
71,400
-199,700
-74% -$2.13M ﹤0.01% 5817
2022
Q4 		$2.87M Sell
271,100
-153,900
-36% -$1.4M ﹤0.01% 3289
2022
Q3 		$2.79M Buy
425,000
+74,300
+21% +$598K ﹤0.01% 3578
2022
Q2 		$3.11M Buy
350,700
+163,400
+87% +$1.75M ﹤0.01% 3384
2022
Q1 		$2.47M Sell
187,300
-40,100
-18% -$541K ﹤0.01% 4332
2021
Q4 		$3.98M Buy
227,400
+69,900
+44% +$1.58M ﹤0.01% 3203
2021
Q3 		$4.41M Sell
157,500
-80,900
-34% -$2.43M ﹤0.01% 2941
2021
Q2 		$8.07M Sell
238,400
-243,900
-51% -$8.26M ﹤0.01% 1977
2021
Q1 		$20.1M Sell
482,300
-156,800
-25% -$6.79M 0.01% 970
2020
Q4 		$19.6M Buy
639,100
+422,400
+195% +$6.39M 0.01% 883
2020
Q3 		$1.5M Buy
216,700
+164,400
+314% +$1.1M ﹤0.01% 3451
2020
Q2 		$349K Buy
+52,300
New +$327K ﹤0.01% 5613

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.