American Century Companies
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American Century Companies’s Magnite MGNI Stock Holding History

American Century Companies’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 		$87.7M Sell
4,622,736
-4,080
-0.1% -$58.4K 0.04% 571
2026
Q1 		$55M Sell
4,626,816
-660,112
-12% -$8.85M 0.03% 712
2025
Q4 		$85.8M Buy
5,286,928
+692,858
+15% +$11.5M 0.04% 481
2025
Q3 		$100M Sell
4,594,070
-235,127
-5% -$5.55M 0.05% 410
2025
Q2 		$116M Buy
4,829,197
+1,868,188
+63% +$27.5M 0.06% 321
2025
Q1 		$33.8M Buy
2,961,009
+2,651,033
+855% +$42.3M 0.02% 794
2024
Q4 		$4.93M Buy
309,976
+17,545
+6% +$257K ﹤0.01% 1609
2024
Q3 		$4.05M Buy
292,431
+45,082
+18% +$614K ﹤0.01% 1685
2024
Q2 		$3.29M Buy
247,349
+32,334
+15% +$353K ﹤0.01% 1686
2024
Q1 		$2.31M Buy
215,015
+51,137
+31% +$511K ﹤0.01% 1831
2023
Q4 		$1.53M Buy
163,878
+69,324
+73% +$548K ﹤0.01% 1904
2023
Q3 		$713K Buy
94,554
+24,559
+35% +$265K ﹤0.01% 2118
2023
Q2 		$955K Buy
69,995
+32,428
+86% +$361K ﹤0.01% 1962
2023
Q1 		$348K Buy
37,567
+23,554
+168% +$251K ﹤0.01% 2254
2022
Q4 		$148K Buy
+14,013
New +$128K ﹤0.01% 2389
2017
Q2 		– Sell
-112,729
Closed -$664K – 1378
2017
Q1 		$664K Sell
112,729
-5,228
-4% -$40.7K ﹤0.01% 1188
2016
Q4 		$875K Buy
117,957
+1,792
+2% +$14K ﹤0.01% 1153
2016
Q3 		$962K Buy
116,165
+8,507
+8% +$90.4K ﹤0.01% 1171
2016
Q2 		$1.47M Buy
+107,658
New +$1.73M ﹤0.01% 1079
2015
Q3 		– Sell
-20,605
Closed -$308K – 1389
2015
Q2 		$308K Buy
+20,605
New +$355K ﹤0.01% 1288

Other funds holding MGNI

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
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
Capital Research Global Investors
Capital Research Global Investors Los Angeles, California $717B AUM 35.42% 1-Year Est. Return
N
Nuveen Charlotte, North Carolina $419B AUM 43.02% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
EC
Edenbrook Capital Mt. Kisco, New York $496M AUM 53.85% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

American Century Companies's MGNI Position: Q2 2026 in Review

American Century Companies reduced its Magnite (MGNI) stake by 0.09% in Q2 2026, selling an estimated $58.4K and leaving 4,622,736 shares worth $87.7M. The position accounts for 0.04% of the portfolio, ranked #571.

American Century Companies first reported a position in MGNI in Q2 2015 and has held it in 20 quarters since. The position peaked at $116M in Q2 2025. 224 funds tracked by Wall St. Rank hold MGNI as of Q2 2026.

  • American Century Companies held 4,622,736 shares of Magnite worth $87.7M as of Q2 2026.
  • American Century Companies sold 4,080 Magnite shares in Q2 2026, an estimated $58.4K.
  • Magnite made up 0.04% of American Century Companies's portfolio in Q2 2026, its #571 holding.
  • American Century Companies first reported a position in Magnite in Q2 2015 and has held it in 20 quarters since.
  • American Century Companies's Magnite position peaked at $116M in Q2 2025.
  • 224 funds tracked by Wall St. Rank held Magnite as of Q2 2026.

Based on American Century Companies's 13F filing for Q2 2026, filed 12 Aug 2026.