Parallax Volatility Advisers
MGNI icon

Parallax Volatility Advisers’s Magnite MGNI Stock Holding History

Parallax Volatility Advisers’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
2025
Q3 		– Sell
-500,000
Closed -$12.1M – 1747
2025
Q2 		$12.1M Sell
500,000
-490,000
-49% -$7.22M 0.03% 376
2025
Q1 		$11.3M Sell
990,000
-850,000
-46% -$13.6M 0.03% 428
2024
Q4 		$29.3M Buy
1,840,000
+10,000
+0.5% +$147K 0.06% 268
2024
Q3 		$25.3M Buy
1,830,000
+45,000
+3% +$613K 0.05% 278
2024
Q2 		$23.7M Hold
1,785,000
– – 0.05% 263
2024
Q1 		$19.2M Sell
1,785,000
-592,500
-25% -$5.92M 0.04% 332
2023
Q4 		$22.2M Sell
2,377,500
-250,000
-10% -$1.98M 0.05% 361
2023
Q3 		$19.8M Sell
2,627,500
-227,400
-8% -$2.45M 0.04% 342
2023
Q2 		$39M Sell
2,854,900
-499,000
-15% -$5.55M 0.08% 198
2023
Q1 		$31.1M Sell
3,353,900
-789,000
-19% -$8.41M 0.06% 290
2022
Q4 		$43.9M Buy
4,142,900
+903,500
+28% +$8.25M 0.07% 302
2022
Q3 		$21.3M Sell
3,239,400
-47,900
-1% -$385K 0.03% 507
2022
Q2 		$29.2M Buy
3,287,300
+1,063,400
+48% +$11.4M 0.03% 389
2022
Q1 		$29.4M Sell
2,223,900
-280,100
-11% -$3.78M 0.02% 390
2021
Q4 		$43.8M Sell
2,504,000
-1,225,000
-33% -$27.6M 0.05% 260
2021
Q3 		$104M Sell
3,729,000
-2,048,200
-35% -$61.6M 0.1% 147
2021
Q2 		$196M Buy
+5,777,200
New +$196M 0.27% 53
2021
Q1 		– Sell
-2,380,600
Closed -$73.1M – 1899
2020
Q4 		$73.1M Buy
2,380,600
+1,630,600
+217% +$24.7M 0.07% 219
2020
Q3 		$5.21M Buy
+750,000
New +$5.01M ﹤0.01% 1299
2020
Q2 		– Sell
-788,200
Closed -$4.38M – 2808
2020
Q1 		$4.38M Buy
+788,200
New +$7.24M 0.01% 921
2019
Q4 		– Sell
-90,000
Closed -$784K – 2553
2019
Q3 		$784K Buy
+90,000
New +$789K ﹤0.01% 1468

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

Parallax Volatility Advisers's MGNI Position: Q1 2026 in Review

Parallax Volatility Advisers reduced its Magnite (MGNI) stake by 76% in Q1 2026, selling an estimated $557K and leaving 13,133 shares worth $156K. The position accounts for ﹤0.01% of the portfolio, ranked #1204.

Parallax Volatility Advisers first reported a position in MGNI in Q1 2017 and has held it in 27 quarters since. The position peaked at $16.3M in Q4 2022. 297 funds tracked by Wall St. Rank hold MGNI as of Q1 2026.

  • Parallax Volatility Advisers held 13,133 shares of Magnite worth $156K as of Q1 2026.
  • Parallax Volatility Advisers sold 41,525 Magnite shares in Q1 2026, an estimated $557K.
  • Magnite made up ﹤0.01% of Parallax Volatility Advisers's portfolio in Q1 2026, its #1204 holding.
  • Parallax Volatility Advisers first reported a position in Magnite in Q1 2017 and has held it in 27 quarters since.
  • Parallax Volatility Advisers's Magnite position peaked at $16.3M in Q4 2022.
  • 297 funds tracked by Wall St. Rank held Magnite as of Q1 2026.

Based on Parallax Volatility Advisers's 13F filing for Q1 2026, filed 15 May 2026.