FCM
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Frontier Capital Management’s Magnite MGNI Stock Holding History

Frontier Capital 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 		– Sell
-944,701
Closed -$15.3M – 310
2025
Q4 		$15.3M Sell
944,701
-148,532
-14% -$2.47M 0.16% 194
2025
Q3 		$23.8M Sell
1,093,233
-700,597
-39% -$16.5M 0.21% 170
2025
Q2 		$43.3M Buy
1,793,830
+1,448,456
+419% +$21.3M 0.4% 94
2025
Q1 		$3.94M Sell
345,374
-301,309
-47% -$4.8M 0.04% 261
2024
Q4 		$10.3M Sell
646,683
-1,112
-0.2% -$16.3K 0.1% 216
2024
Q3 		$8.97M Sell
647,795
-4,891
-0.7% -$66.6K 0.08% 218
2024
Q2 		$8.67M Sell
652,686
-7,501
-1% -$82K 0.09% 222
2024
Q1 		$7.1M Sell
660,187
-8,140
-1% -$81.3K 0.07% 232
2023
Q4 		$6.24M Sell
668,327
-34,989
-5% -$276K 0.06% 224
2023
Q3 		$5.3M Sell
703,316
-1,085,843
-61% -$11.7M 0.06% 228
2023
Q2 		$24.4M Sell
1,789,159
-887,458
-33% -$9.88M 0.23% 146
2023
Q1 		$24.8M Buy
2,676,617
+1,090,309
+69% +$11.6M 0.26% 138
2022
Q4 		$16.8M Buy
+1,586,308
New +$14.5M 0.18% 169
2021
Q2 		– Sell
-3,373,124
Closed -$140M – 293
2021
Q1 		$140M Buy
3,373,124
+2,572,412
+321% +$111M 1.06% 16
2020
Q4 		$24.6M Buy
+800,712
New +$12.1M 0.18% 171

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

Frontier Capital Management's MGNI Position: Q1 2026 in Review

Frontier Capital Management sold out of Magnite (MGNI) in Q1 2026, closing a stake of 944,701 shares — an estimated $15.3M sold.

Frontier Capital Management first reported a position in MGNI in Q4 2020 and held it in 15 quarters. The position peaked at $140M in Q1 2021. 296 funds tracked by Wall St. Rank hold MGNI as of Q1 2026.

  • Frontier Capital Management reported no remaining Magnite position as of Q1 2026 after selling out during the quarter.
  • Frontier Capital Management sold 944,701 Magnite shares in Q1 2026, an estimated $15.3M.
  • Frontier Capital Management first reported a position in Magnite in Q4 2020 and held it in 15 quarters.
  • Frontier Capital Management's Magnite position peaked at $140M in Q1 2021.
  • 296 funds tracked by Wall St. Rank held Magnite as of Q1 2026.

Based on Frontier Capital Management's 13F filing for Q1 2026, filed 15 May 2026.