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Equibles

Walleye Trading LLC

Position in MGNI — Magnite, Inc.

CIK 1388391 NEW YORK, NY
Back to MGNI Full portfolio

Position in MGNI

as of Mar 31, 2026 · filed May 11, 2026
Position Value
$2,131,200
+$1,273,169 QoQ
Shares Held
179,394
+239.3% QoQ
Ownership
0.125%
of shares outstanding
% of Portfolio
0.05%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Dec 2020
22 quarters on record
Voting authority Sole 100.ToString("F0")% Shared 0.ToString("F0")% None 0.ToString("F0")%

Common Shares in MGNI Over Time

Shares Held

Position Value (USD)

Derivatives in MGNI

reported options exposure · as of Mar 31, 2026
CallValue
$9,652,500
CallShares
812,500
PutValue
$3,554,496
PutShares
299,200

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 Mar 31, 2026

Walleye Trading LLC holds $8,837,823 across 4 Advertising Agencies names. MGNI ranks #3 (24.1% of the industry book) .

# Ticker Company Shares Value (USD) Open
1 TTD
Trade Desk, Inc.
 155,208 $3,521,669
2 OMC
Omnicom Group Inc.
 40,014 $3,013,454
3 MGNI
Magnite, Inc.
This page 		179,394 $2,131,200
4 CRTO
Criteo S.A.
 9,565 $171,500

All Filings in MGNI

Export CSV
50 filing rows on record
Report Date Value (USD) Shares
2026-03-31 $2,131,200 179,394
2026-03-31 $3,554,496 299,200
2026-03-31 $9,652,500 812,500
2025-12-31 $2,687,688 165,600
2025-12-31 $858,031 52,867
2025-12-31 $7,162,299 441,300
2025-09-30 $6,104,934 280,300
2025-09-30 $376,358 17,280
2025-09-30 $1,637,856 75,200
2025-06-30 $3,712,068 153,900
2025-06-30 $250,848 10,400
2025-03-31 $95,844 8,400
2025-03-31 $391,363 34,300
2025-03-31 $82,380 7,220
2024-12-31 $113,032 7,100
2024-12-31 $191,183 12,009
2024-12-31 $1,125,544 70,700
2024-09-30 $92,795 6,700
2024-09-30 $900,250 65,000
2024-09-30 $150,757 10,885
2024-06-30 $237,891 17,900
2024-06-30 $240,389 18,088
2024-06-30 $1,016,685 76,500
2024-03-31 $1,070,700 99,600
2024-03-31 $205,325 19,100
2023-12-31 $980,700 105,000
2023-12-31 $1,868 200
2023-09-30 $55,042 7,300
2023-09-30 $914,602 121,300
2023-06-30 $2,130,765 156,100
2023-06-30 $682,500 50,000
2023-03-31 $189,830 20,500
2023-03-31 $476,890 51,500
2023-03-31 $110,860 11,972
2022-12-31 $14,826 1,400
2022-12-31 $1,016,640 96,000
2022-09-30 $45,990 7,000
2022-09-30 $433,620 66,000
2022-09-30 $218,938 33,324
2022-06-30 $61,272 6,900
2022-06-30 $192,900 21,723
2022-06-30 $541,680 61,000
2022-03-31 $298,295 22,581
2022-03-31 $1,044,911 79,100
2022-03-31 $714,661 54,100
2021-12-31 $2,131,500 121,800
2021-12-31 $2,220,750 126,900
2021-12-31 $922,407 52,709
2021-09-30 $158,396 5,657
2021-09-30 $218,400 7,800

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