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Parallax Volatility Advisers, L.P.

Position in MGNI — Magnite, Inc.

CIK 1521001 San Francisco, CA

Position in MGNI

as of Jun 30, 2026 · filed Aug 14, 2026
Position Value
$317,782
+$161,762 QoQ
Shares Held
16,743
+27.5% QoQ
Ownership
0.012%
of shares outstanding
% of Portfolio
0.02%
of 13F equity value
Holder Rank
#191
of 306 holders
Holding Since
Sep 2020
24 quarters on record
Voting authority Sole 100% Shared 0% None 0%

Common Shares in MGNI Over Time

Shares Held

Position Value (USD)

Derivatives in MGNI

reported options exposure · as of Dec 31, 2025
CallValue
$146,070
CallShares
9,000
PutValue
$0
PutShares
0

Notional value of option positions as reported on Form 13F. Calls and puts are disclosed separately and do not net against the common-share stake above.

Position in Advertising Agencies

Communication Services · as of Jun 30, 2026

Parallax Volatility Advisers, L.P. holds $319,327 across 2 Advertising Agencies names. MGNI ranks #1 (99.5% of the industry book) .

# Ticker Company Shares Value (USD) Open
1 MGNI
Magnite, Inc.
This page
16,743 $317,782

All Filings in MGNI

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50 filing rows on record
Report Date Value (USD) Shares
2026-06-30 $317,782 16,743
2026-03-31 $156,020 13,133
2025-12-31 $887,099 54,658
2025-12-31 $146,070 9,000
2025-09-30 $2,846,275 130,683
2025-09-30 $304,920 14,000
2025-06-30 $12,060,000 500,000
2025-06-30 $337,680 14,000
2025-06-30 $4,240,609 175,813
2025-03-31 $11,295,900 990,000
2025-03-31 $3,069,096 268,983
2024-12-31 $729,136 45,800
2024-12-31 $3,470,018 217,966
2024-12-31 $29,292,800 1,840,000
2024-09-30 $1,119,080 80,800
2024-09-30 $25,345,500 1,830,000
2024-09-30 $4,985,653 359,975
2024-06-30 $23,722,650 1,785,000
2024-06-30 $1,073,832 80,800
2024-06-30 $7,193,544 541,275
2024-03-31 $8,029,175 746,900
2024-03-31 $492,350 45,800
2024-03-31 $19,188,750 1,785,000
2023-12-31 $10,644,844 1,139,705
2023-12-31 $934 100
2023-12-31 $22,205,850 2,377,500
2023-09-30 $5,655,754 750,100
2023-09-30 $19,811,350 2,627,500
2023-09-30 $12,992,452 1,723,137
2023-06-30 $38,969,385 2,854,900
2023-06-30 $10,781,275 789,837
2023-06-30 $6,826,365 500,100
2023-03-31 $7,982,120 862,000
2023-03-31 $10,891,482 1,176,186
2023-03-31 $31,057,114 3,353,900
2022-12-31 $16,304,999 1,539,660
2022-12-31 $43,873,311 4,142,900
2022-12-31 $3,774,276 356,400
2022-09-30 $12,685,093 1,930,760
2022-09-30 $59,787 9,100
2022-09-30 $21,282,858 3,239,400
2022-06-30 $2,109,888 237,600
2022-06-30 $11,499,804 1,295,023
2022-06-30 $29,191,224 3,287,300
2022-03-31 $14,723,826 1,114,597
2022-03-31 $29,377,719 2,223,900
2022-03-31 $36,988 2,800
2021-12-31 $9,453,045 540,174
2021-12-31 $43,820,000 2,504,000
2021-12-31 $3,305,750 188,900