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PDT Partners’s Magnite MGNI Stock Holding History

PDT Partners’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
2025
Q3 		– Sell
-63,448
Closed -$1.53M – 666
2025
Q2 		$1.53M Buy
+63,448
New +$935K 0.09% 349
2022
Q4 		– Sell
-68,347
Closed -$449K – 792
2022
Q3 		$449K Sell
68,347
-32,394
-32% -$261K 0.07% 461
2022
Q2 		$895K Buy
100,741
+12,591
+14% +$135K 0.08% 430
2022
Q1 		$1.16M Buy
88,150
+30,478
+53% +$411K 0.1% 322
2021
Q4 		$1.01M Buy
57,672
+44,547
+339% +$1M 0.08% 357
2021
Q3 		$368K Sell
13,125
-8,714
-40% -$262K 0.03% 549
2021
Q2 		$739K Buy
+21,839
New +$740K 0.05% 426
2020
Q2 		– Sell
-137,800
Closed -$765K – 757
2020
Q1 		$765K Buy
137,800
+17,572
+15% +$162K 0.06% 277
2019
Q4 		$981K Buy
120,228
+58,229
+94% +$479K 0.06% 285
2019
Q3 		$540K Buy
+61,999
New +$543K 0.03% 334
2016
Q2 		– Sell
-69,115
Closed -$1.26M – 516
2016
Q1 		$1.26M Buy
+69,115
New +$1.06M 0.08% 283

Other funds holding MGNI

Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Capital Research Global Investors
Capital Research Global Investors Los Angeles, California $645B AUM 30.41% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return
American Century Companies
American Century Companies Kansas City, Missouri $194B AUM 35% 1-Year Est. Return
Boston Partners
Boston Partners Boston, Massachusetts $95.5B AUM 28.4% 1-Year Est. Return
GIM
Granahan Investment Management Waltham, Massachusetts $2.07B AUM 56.45% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

PDT Partners's MGNI Position: Q3 2025 in Review

PDT Partners sold out of Magnite (MGNI) in Q3 2025, closing a stake of 63,448 shares — an estimated $1.53M sold.

PDT Partners first reported a position in MGNI in Q1 2016 and held it in 11 quarters. The position peaked at $1.53M in Q2 2025. 316 funds tracked by Wall St. Rank hold MGNI as of Q3 2025.

  • PDT Partners reported no remaining Magnite position as of Q3 2025 after selling out during the quarter.
  • PDT Partners sold 63,448 Magnite shares in Q3 2025, an estimated $1.53M.
  • PDT Partners first reported a position in Magnite in Q1 2016 and held it in 11 quarters.
  • PDT Partners's Magnite position peaked at $1.53M in Q2 2025.
  • 316 funds tracked by Wall St. Rank held Magnite as of Q3 2025.

Based on PDT Partners's 13F filing for Q3 2025, filed 17 Nov 2025.