Group One Trading
MGNI icon

Group One Trading’s Magnite MGNI Stock Holding History

Group One Trading’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 		$247K Sell
20,800
-85,800
-80% -$1.15M ﹤0.01% 3945
2025
Q4 		$1.73M Buy
106,600
+30,100
+39% +$500K ﹤0.01% 2403
2025
Q3 		$1.67M Sell
76,500
-87,500
-53% -$2.07M ﹤0.01% 2507
2025
Q2 		$3.96M Buy
164,000
+86,800
+112% +$1.28M 0.01% 1505
2025
Q1 		$881K Buy
77,200
+28,300
+58% +$451K ﹤0.01% 2572
2024
Q4 		$778K Buy
48,900
+33,400
+215% +$490K ﹤0.01% 2790
2024
Q3 		$215K Buy
15,500
+2,200
+17% +$30K ﹤0.01% 3554
2024
Q2 		$177K Buy
13,300
+4,200
+46% +$45.9K ﹤0.01% 3503
2024
Q1 		$97.8K Sell
9,100
-26,800
-75% -$268K ﹤0.01% 4184
2023
Q4 		$335K Buy
35,900
+23,100
+180% +$183K ﹤0.01% 3410
2023
Q3 		$96.5K Sell
12,800
-11,700
-48% -$126K ﹤0.01% 4490
2023
Q2 		$334K Sell
24,500
-20,200
-45% -$225K ﹤0.01% 3426
2023
Q1 		$414K Buy
44,700
+41,500
+1,297% +$442K ﹤0.01% 2943
2022
Q4 		$33.9K Sell
3,200
-71,900
-96% -$656K ﹤0.01% 5259
2022
Q3 		$493K Sell
75,100
-28,500
-28% -$229K ﹤0.01% 3252
2022
Q2 		$920K Sell
103,600
-80,300
-44% -$861K ﹤0.01% 2840
2022
Q1 		$2.43M Sell
183,900
-141,400
-43% -$1.91M ﹤0.01% 2217
2021
Q4 		$5.69M Sell
325,300
-900
-0.3% -$20.3K ﹤0.01% 1586
2021
Q3 		$9.13M Sell
326,200
-147,200
-31% -$4.43M 0.01% 1137
2021
Q2 		$16M Buy
473,400
+134,900
+40% +$4.57M 0.02% 767
2021
Q1 		$14.1M Sell
338,500
-29,500
-8% -$1.28M 0.02% 727
2020
Q4 		$11.3M Buy
368,000
+236,300
+179% +$3.58M 0.02% 738
2020
Q3 		$915K Buy
131,700
+88,000
+201% +$588K ﹤0.01% 2282
2020
Q2 		$291K Buy
43,700
+14,200
+48% +$88.7K ﹤0.01% 3075
2020
Q1 		$164K Buy
29,500
+8,900
+43% +$81.8K ﹤0.01% 2912
2019
Q4 		$168K Buy
20,600
+10,600
+106% +$87.1K ﹤0.01% 3297
2019
Q3 		$87K Buy
+10,000
New +$87.7K ﹤0.01% 3650
2019
Q1 		– Sell
-58,600
Closed -$219K – 5132
2018
Q4 		$219K Sell
58,600
-126,600
-68% -$484K ﹤0.01% 2616
2018
Q3 		$667K Buy
185,200
+76,500
+70% +$270K 0.01% 2025
2018
Q2 		$310K Buy
108,700
+94,500
+665% +$225K ﹤0.01% 2692
2018
Q1 		$26K Sell
14,200
-2,700
-16% -$5.12K ﹤0.01% 3982
2017
Q4 		$32K Buy
16,900
+15,200
+894% +$38K ﹤0.01% 3951
2017
Q3 		$7K Sell
1,700
-22,900
-93% -$97.5K ﹤0.01% 4390
2017
Q2 		$126K Sell
24,600
-250,300
-91% -$1.38M ﹤0.01% 2968
2017
Q1 		$1.62M Buy
+274,900
New +$2.14M 0.02% 1004
2016
Q4 		– Sell
-1,200
Closed -$10K – 4662
2016
Q3 		$10K Hold
1,200
– – ﹤0.01% 4048
2016
Q2 		$16K Buy
+1,200
New +$19.3K ﹤0.01% 3898
2015
Q3 		– Sell
-37,500
Closed -$561K – 5042
2015
Q2 		$561K Buy
37,500
+35,700
+1,983% +$615K 0.01% 1682
2015
Q1 		$32K Sell
1,800
-600
-25% -$10.1K ﹤0.01% 3625
2014
Q4 		$39K Buy
+2,400
New +$31K ﹤0.01% 3530

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

Group One Trading's MGNI Position: Q1 2026 in Review

Group One Trading increased its Magnite (MGNI) stake by 368% in Q1 2026, buying an estimated $263K and bringing the position to 24,999 shares worth $297K. The position accounts for ﹤0.01% of the portfolio, ranked #3808.

Group One Trading first reported a position in MGNI in Q4 2014 and has held it in 32 quarters since. The position peaked at $8.64M in Q4 2020. 296 funds tracked by Wall St. Rank hold MGNI as of Q1 2026.

  • Group One Trading held 24,999 shares of Magnite worth $297K as of Q1 2026.
  • Group One Trading bought 19,652 Magnite shares in Q1 2026, an estimated $263K.
  • Magnite made up ﹤0.01% of Group One Trading's portfolio in Q1 2026, its #3808 holding.
  • Group One Trading first reported a position in Magnite in Q4 2014 and has held it in 32 quarters since.
  • Group One Trading's Magnite position peaked at $8.64M in Q4 2020.
  • 296 funds tracked by Wall St. Rank held Magnite as of Q1 2026.

Based on Group One Trading's 13F filing for Q1 2026, filed 13 May 2026.