Acadian Asset Management
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Acadian Asset Management’s Magnite MGNI Stock Holding History

Acadian Asset Management’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
Q1 		$43K Buy
+3,686
New +$49.4K ﹤0.01% 1874
2024
Q4 		– Sell
-1,259
Closed -$17K – 1958
2024
Q3 		$17K Buy
+1,259
New +$17.2K ﹤0.01% 1999
2021
Q1 		– Sell
-1,060
Closed -$33K – 2218
2020
Q4 		$33K Buy
+1,060
New +$16K ﹤0.01% 2043
2020
Q2 		– Sell
-1,216,603
Closed -$6.75M – 2296
2020
Q1 		$6.75M Buy
1,216,603
+269,963
+29% +$2.48M 0.04% 332
2019
Q4 		$7.72M Sell
946,640
-22,136
-2% -$182K 0.04% 361
2019
Q3 		$8.44M Buy
968,776
+346,279
+56% +$3.04M 0.04% 371
2019
Q2 		$3.96M Buy
622,497
+67,369
+12% +$414K 0.02% 447
2019
Q1 		$3.38M Buy
555,128
+383,622
+224% +$1.97M 0.01% 537
2018
Q4 		$640K Buy
171,506
+129,667
+310% +$495K ﹤0.01% 851
2018
Q3 		$150K Buy
41,839
+27,318
+188% +$96.6K ﹤0.01% 1126
2018
Q2 		$41K Sell
14,521
-66,981
-82% -$159K ﹤0.01% 1432
2018
Q1 		$147K Buy
+81,502
New +$154K ﹤0.01% 1134
2017
Q2 		– Sell
-293,398
Closed -$1.73M – 1525
2017
Q1 		$1.73M Buy
293,398
+188,731
+180% +$1.47M 0.01% 655
2016
Q4 		$778K Sell
104,667
-412,407
-80% -$3.21M ﹤0.01% 767
2016
Q3 		$4.28M Buy
+517,074
New +$5.5M 0.02% 397
2016
Q2 		– Sell
-5,097
Closed -$93K – 1472
2016
Q1 		$93K Buy
+5,097
New +$78K ﹤0.01% 1034

Other funds holding MGNI

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
Capital Research Global Investors
Capital Research Global Investors Los Angeles, California $645B AUM 30.41% 1-Year Est. Return
Boston Partners
Boston Partners Boston, Massachusetts $95.5B AUM 28.4% 1-Year Est. Return
American Century Companies
American Century Companies Kansas City, Missouri $194B AUM 35% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return
N
Nuveen Charlotte, North Carolina $369B AUM 31.66% 1-Year Est. Return

Acadian Asset Management's MGNI Position: Q1 2026 in Review

Acadian Asset Management opened a new position in Magnite (MGNI) in Q1 2026: 3,686 shares worth $43K. The stake represents ﹤0.01% of the portfolio and ranks #1874 among its holdings. This is a return to the name: Acadian Asset Management previously reported a position in MGNI as recently as Q3 2024.

Acadian Asset Management first reported a position in MGNI in Q1 2016 and has held it in 16 quarters since. The position peaked at $8.44M in Q3 2019. 296 funds tracked by Wall St. Rank hold MGNI as of Q1 2026.

  • Acadian Asset Management held 3,686 shares of Magnite worth $43K as of Q1 2026.
  • Magnite was a new Acadian Asset Management position in Q1 2026.
  • Magnite made up ﹤0.01% of Acadian Asset Management's portfolio in Q1 2026, its #1874 holding.
  • Acadian Asset Management first reported a position in Magnite in Q1 2016 and has held it in 16 quarters since.
  • Acadian Asset Management's Magnite position peaked at $8.44M in Q3 2019.
  • 296 funds tracked by Wall St. Rank held Magnite as of Q1 2026.

Based on Acadian Asset Management's 13F filing for Q1 2026, filed 13 May 2026.