Wellington Management Group
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Wellington Management Group’s Magnite MGNI Stock Holding History

Wellington Management Group’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 		$115M Sell
6,044,492
-3,146,585
-34% -$45.1M 0.02% 518
2026
Q1 		$109M Buy
9,191,077
+561,839
+7% +$7.53M 0.02% 530
2025
Q4 		$140M Buy
8,629,238
+3,484,689
+68% +$57.8M 0.02% 473
2025
Q3 		$112M Sell
5,144,549
-303,288
-6% -$7.16M 0.02% 532
2025
Q2 		$131M Sell
5,447,837
-455,434
-8% -$6.71M 0.02% 460
2025
Q1 		$67.4M Sell
5,903,271
-1,126,740
-16% -$18M 0.01% 600
2024
Q4 		$112M Buy
7,030,011
+450,341
+7% +$6.61M 0.02% 504
2024
Q3 		$91.1M Buy
6,579,670
+3,659,759
+125% +$49.9M 0.02% 559
2024
Q2 		$38.8M Buy
2,919,911
+114,087
+4% +$1.25M 0.01% 763
2024
Q1 		$30.2M Sell
2,805,824
-133,717
-5% -$1.34M 0.01% 850
2023
Q4 		$27.5M Buy
2,939,541
+52,129
+2% +$412K 0.01% 873
2023
Q3 		$21.8M Buy
2,887,412
+795,145
+38% +$8.57M ﹤0.01% 915
2023
Q2 		$28.6M Buy
2,092,267
+487,670
+30% +$5.43M 0.01% 856
2023
Q1 		$14.9M Buy
1,604,597
+120,697
+8% +$1.29M ﹤0.01% 1004
2022
Q4 		$15.7M Buy
1,483,900
+71,597
+5% +$654K ﹤0.01% 975
2022
Q3 		$9.28M Buy
+1,412,303
New +$11.4M ﹤0.01% 1121
2021
Q3 		– Sell
-12,365
Closed -$418K – 2221
2021
Q2 		$418K Buy
+12,365
New +$419K ﹤0.01% 1954
2020
Q4 		– Sell
-4,326,109
Closed -$30M – 1976
2020
Q3 		$30M Buy
4,326,109
+805,740
+23% +$5.38M 0.01% 850
2020
Q2 		$23.5M Buy
3,520,369
+1,039,494
+42% +$6.49M 0.01% 890
2020
Q1 		$13.8M Buy
2,480,875
+882,840
+55% +$8.11M ﹤0.01% 965
2019
Q4 		$13M Buy
1,598,035
+364,781
+30% +$3M ﹤0.01% 1098
2019
Q3 		$10.7M Sell
1,233,254
-341,300
-22% -$2.99M ﹤0.01% 1142
2019
Q2 		$10M Buy
+1,574,554
New +$9.67M ﹤0.01% 1208

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
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
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

Wellington Management Group's MGNI Position: Q2 2026 in Review

Wellington Management Group reduced its Magnite (MGNI) stake by 34% in Q2 2026, selling an estimated $45.1M and leaving 6,044,492 shares worth $115M. The position accounts for 0.02% of the portfolio, ranked #518.

Wellington Management Group first reported a position in MGNI in Q2 2019 and has held it in 23 quarters since. The position peaked at $140M in Q4 2025. 310 funds tracked by Wall St. Rank hold MGNI as of Q2 2026.

  • Wellington Management Group held 6,044,492 shares of Magnite worth $115M as of Q2 2026.
  • Wellington Management Group sold 3,146,585 Magnite shares in Q2 2026, an estimated $45.1M.
  • Magnite made up 0.02% of Wellington Management Group's portfolio in Q2 2026, its #518 holding.
  • Wellington Management Group first reported a position in Magnite in Q2 2019 and has held it in 23 quarters since.
  • Wellington Management Group's Magnite position peaked at $140M in Q4 2025.
  • 310 funds tracked by Wall St. Rank held Magnite as of Q2 2026.

Based on Wellington Management Group's 13F filing for Q2 2026, filed 14 Aug 2026.