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Caption Management’s Magnite MGNI Stock Holding History

Caption 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 		$4.81M Buy
405,053
+388,853
+2,400% +$5.21M 0.03% 544
2025
Q4 		$263K Buy
+16,200
New +$269K ﹤0.01% 1342
2024
Q4 		– Sell
-36,677
Closed -$538K – 1685
2024
Q3 		$508K Buy
+36,677
New +$500K 0.01% 924
2024
Q1 		– Sell
-11,648
Closed -$116K – 1500
2023
Q4 		$109K Buy
+11,648
New +$92K ﹤0.01% 1171
2022
Q1 		– Sell
-26,500
Closed -$357K – 1751
2021
Q4 		$465K Buy
+26,500
New +$597K 0.01% 1265
2021
Q3 		– Sell
-4,800
Closed -$162K – 1676
2021
Q2 		$162K Buy
+4,800
New +$163K ﹤0.01% 1195
2020
Q4 		– Sell
-39,005
Closed -$590K – 1154
2020
Q3 		$270K Buy
+39,005
New +$261K 0.01% 871
2020
Q1 		– Sell
-19,238
Closed -$177K – 985
2019
Q4 		$157K Buy
+19,238
New +$158K 0.01% 736
2019
Q1 		– Sell
-1,358,203
Closed -$5.07M – 673
2018
Q4 		$5.07M Buy
1,358,203
+64,582
+5% +$247K 0.4% 78
2018
Q3 		$4.66M Hold
1,293,621
– – 0.26% 108
2018
Q2 		$3.69M Sell
1,293,621
-107,000
-8% -$255K 0.29% 105
2018
Q1 		$2.52M Buy
1,400,621
+742,721
+113% +$1.41M 0.36% 85
2017
Q4 		$1.23M Buy
+657,900
New +$1.64M 0.13% 163

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

Caption Management's MGNI Position: Q1 2026 in Review

Caption Management increased its Magnite (MGNI) stake by 2,400% in Q1 2026, buying an estimated $5.21M and bringing the position to 405,053 shares worth $4.81M. The position accounts for 0.03% of the portfolio, ranked #544.

Caption Management first reported a position in MGNI in Q4 2017 and has held it in 13 quarters since. The position peaked at $5.07M in Q4 2018. 297 funds tracked by Wall St. Rank hold MGNI as of Q1 2026.

  • Caption Management held 405,053 shares of Magnite worth $4.81M as of Q1 2026.
  • Caption Management bought 388,853 Magnite shares in Q1 2026, an estimated $5.21M.
  • Magnite made up 0.03% of Caption Management's portfolio in Q1 2026, its #544 holding.
  • Caption Management first reported a position in Magnite in Q4 2017 and has held it in 13 quarters since.
  • Caption Management's Magnite position peaked at $5.07M in Q4 2018.
  • 297 funds tracked by Wall St. Rank held Magnite as of Q1 2026.

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