Parallax Volatility Advisers
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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
2026
Q1 		– Sell
-9,000
Closed -$146K – 1711
2025
Q4 		$146K Sell
9,000
-5,000
-36% -$83K ﹤0.01% 1415
2025
Q3 		$305K Hold
14,000
– – ﹤0.01% 1319
2025
Q2 		$338K Buy
+14,000
New +$206K ﹤0.01% 1256
2025
Q1 		– Sell
-45,800
Closed -$729K – 1915
2024
Q4 		$729K Sell
45,800
-35,000
-43% -$514K ﹤0.01% 1421
2024
Q3 		$1.12M Hold
80,800
– – ﹤0.01% 1328
2024
Q2 		$1.07M Buy
80,800
+35,000
+76% +$383K ﹤0.01% 1238
2024
Q1 		$492K Buy
45,800
+45,700
+45,700% +$457K ﹤0.01% 1412
2023
Q4 		$934 Sell
100
-750,000
-100% -$5.93M ﹤0.01% 2094
2023
Q3 		$5.66M Buy
750,100
+250,000
+50% +$2.7M 0.01% 722
2023
Q2 		$6.83M Sell
500,100
-361,900
-42% -$4.03M 0.01% 664
2023
Q1 		$7.98M Buy
862,000
+505,600
+142% +$5.39M 0.02% 664
2022
Q4 		$3.77M Buy
356,400
+347,300
+3,816% +$3.17M 0.01% 1138
2022
Q3 		$60K Sell
9,100
-228,500
-96% -$1.84M ﹤0.01% 2587
2022
Q2 		$2.11M Buy
237,600
+234,800
+8,386% +$2.52M ﹤0.01% 1322
2022
Q1 		$37K Sell
2,800
-186,100
-99% -$2.51M ﹤0.01% 2524
2021
Q4 		$3.31M Buy
188,900
+188,800
+188,800% +$4.26M ﹤0.01% 915
2021
Q3 		$3K Sell
100
-1,059,500
-100% -$31.9M ﹤0.01% 1946
2021
Q2 		$35.9M Buy
+1,059,600
New +$35.9M 0.05% 250
2021
Q1 		– Sell
-2,188,500
Closed -$67.2M – 1897
2020
Q4 		$67.2M Buy
2,188,500
+1,888,500
+630% +$28.6M 0.07% 235
2020
Q3 		$2.08M Buy
+300,000
New +$2M ﹤0.01% 1692
2020
Q1 		– Sell
-165,000
Closed -$1.35M – 2623
2019
Q4 		$1.35M Buy
+165,000
New +$1.36M ﹤0.01% 1395

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.