Simplex Trading’s Magnite MGNI Stock Holding History

Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake
Trade Value Portfolio Weight Portfolio Position
2026
Q1
$185K Sell
15,600
-153,500
-91% -$2.06M ﹤0.01% 4392
2025
Q4
$2.74M Sell
169,100
-15,600
-8% -$259K ﹤0.01% 1726
2025
Q3
$4.02M Buy
184,700
+4,000
+2% +$94.5K ﹤0.01% 1672
2025
Q2
$4.36M Buy
180,700
+96,200
+114% +$1.42M ﹤0.01% 1466
2025
Q1
$964K Sell
84,500
-4,600
-5% -$73.3K ﹤0.01% 2738
2024
Q4
$1.42M Buy
89,100
+35,600
+67% +$522K ﹤0.01% 2518
2024
Q3
$740K Sell
53,500
-47,000
-47% -$640K ﹤0.01% 3206
2024
Q2
$1.33M Buy
100,500
+67,700
+206% +$740K ﹤0.01% 2609
2024
Q1
$352K Sell
32,800
-11,200
-25% -$112K ﹤0.01% 4218
2023
Q4
$410K Buy
44,000
+4,000
+10% +$31.6K ﹤0.01% 3910
2023
Q3
$301K Buy
40,000
+22,500
+129% +$243K ﹤0.01% 3938
2023
Q2
$238K Sell
17,500
-26,600
-60% -$296K ﹤0.01% 4100
2023
Q1
$408K Buy
44,100
+28,600
+185% +$305K ﹤0.01% 3480
2022
Q4
$164K Sell
15,500
-21,700
-58% -$198K ﹤0.01% 4479
2022
Q3
$244K Sell
37,200
-18,200
-33% -$146K ﹤0.01% 4356
2022
Q2
$491K Sell
55,400
-9,700
-15% -$104K ﹤0.01% 3469
2022
Q1
$859K Sell
65,100
-27,700
-30% -$374K ﹤0.01% 3097
2021
Q4
$1.62M Buy
92,800
+43,700
+89% +$985K ﹤0.01% 2265
2021
Q3
$1.7M Buy
49,100
+500
+1% +$15K ﹤0.01% 2377
2021
Q2
$1.64M Buy
48,600
+47,707
+5,342% +$1.62M ﹤0.01% 2442
2021
Q1
$3.71M Buy
893
+113
+14% +$4.89K 0.01% 1056
2020
Q4
$2.4M Buy
780
+738
+1,757% +$11.2K ﹤0.01% 1588
2020
Q3
$29K Buy
+42
New +$281 ﹤0.01% 6103
2020
Q2
Sell
-20
Closed -$11K 8042
2020
Q1
$11K Sell
20
-77
-79% -$708 ﹤0.01% 6417
2019
Q4
$79K Buy
97
+94
+3,133% +$773 ﹤0.01% 4749
2019
Q3
$2K Sell
3
-222
-99% -$1.95K ﹤0.01% 6931
2019
Q2
$143K Sell
225
-24
-10% -$147 ﹤0.01% 3819
2019
Q1
$151K Buy
249
+214
+611% +$1.1K ﹤0.01% 3909
2018
Q4
$13K Hold
35
﹤0.01% 5670
2018
Q3
$12K Buy
35
+20
+133% +$71 ﹤0.01% 6318
2018
Q2
$4K Buy
+15
New +$36 ﹤0.01% 6809
2018
Q1
Sell
-20
Closed -$5K 6570
2017
Q4
$5K Sell
20
-11
-35% -$27 ﹤0.01% 4521
2017
Q3
$3K Sell
31
-33
-52% -$140 ﹤0.01% 4807
2017
Q2
$5K Buy
64
+31
+94% +$170 ﹤0.01% 4592
2017
Q1
$5K Buy
33
+21
+175% +$164 ﹤0.01% 4593
2016
Q4
$1K Sell
12
-12
-50% -$94 ﹤0.01% 5436
2016
Q3
$1K Buy
+24
New +$255 ﹤0.01% 5370
2015
Q4
Sell
-13
Closed -$1K 5829
2015
Q3
$1K Buy
+13
New +$198 ﹤0.01% 5069
2015
Q1
Sell
-29
Closed -$1K 5326
2014
Q4
$1K Buy
+29
New +$374 ﹤0.01% 4178

Other funds holding MGNI

Simplex Trading's MGNI Position: Q1 2026 in Review

Simplex Trading reduced its Magnite (MGNI) stake by 96% in Q1 2026, selling an estimated $3.38M and leaving 11,316 shares worth $134K. The position accounts for ﹤0.01% of the portfolio, ranked #4749.

Simplex Trading first reported a position in MGNI in Q4 2014 and has held it in 30 quarters since. The position peaked at $4.27M in Q4 2025. 297 funds tracked by Wall St. Rank hold MGNI as of Q1 2026.

  • Simplex Trading held 11,316 shares of Magnite worth $134K as of Q1 2026.
  • Simplex Trading sold 252,046 Magnite shares in Q1 2026, an estimated $3.38M.
  • Magnite made up ﹤0.01% of Simplex Trading's portfolio in Q1 2026, its #4749 holding.
  • Simplex Trading first reported a position in Magnite in Q4 2014 and has held it in 30 quarters since.
  • Simplex Trading's Magnite position peaked at $4.27M in Q4 2025.
  • 297 funds tracked by Wall St. Rank held Magnite as of Q1 2026.

Based on Simplex Trading's 13F filing for Q1 2026, filed 14 May 2026.