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Equibles

JANE STREET GROUP, LLC

Position in MGNI — Magnite, Inc.

CIK 1595888 NEW YORK, NY
Back to MGNI Full portfolio

Position in MGNI

as of Mar 31, 2026 · filed May 12, 2026
Position Value
$19,817,740
+$13,646,236 QoQ
Shares Held
1,668,160
+338.7% QoQ
Ownership
1.16%
of shares outstanding
% of Portfolio
0.03%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Sep 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
$318,384
CallShares
26,800
PutValue
$1,096,524
PutShares
92,300

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

JANE STREET GROUP, LLC holds $52,965,739 across 13 Advertising Agencies names. MGNI ranks #1 (37.4% of the industry book) .

# Ticker Company Shares Value (USD) Open
1 MGNI
Magnite, Inc.
This page 		1,668,160 $19,817,740
2 STGW
Stagwell Inc
 1,629,932 $10,252,271
3 TTD
Trade Desk, Inc.
 382,769 $8,685,026
4 APP
AppLovin Corp
 14,061 $5,596,278
5 CCO
Clear Channel Outdoor Holdings, Inc.
 1,497,223 $3,548,417
6 NEXN
Nexxen International Ltd.
 340,550 $2,220,385
7 WPP
WPP plc
 110,247 $1,714,340
8 OMC
Omnicom Group Inc.
 5,602 $421,886

All Filings in MGNI

Export CSV
50 filing rows on record
Report Date Value (USD) Shares
2026-03-31 $318,384 26,800
2026-03-31 $1,096,524 92,300
2026-03-31 $19,817,740 1,668,160
2025-12-31 $3,578,715 220,500
2025-12-31 $6,171,504 380,253
2025-12-31 $2,118,015 130,500
2025-09-30 $23,753,768 1,090,623
2025-09-30 $2,794,374 128,300
2025-09-30 $6,527,466 299,700
2025-06-30 $6,857,074 284,290
2025-06-30 $1,271,124 52,700
2025-06-30 $5,668,200 235,000
2025-03-31 $677,754 59,400
2025-03-31 $2,191,861 192,100
2025-03-31 $3,043,457 266,736
2024-12-31 $184,798 11,608
2024-12-31 $5,466,928 343,400
2024-12-31 $1,224,248 76,900
2024-09-30 $728,510 52,600
2024-09-30 $4,037,275 291,500
2024-09-30 $11,747,624 848,204
2024-06-30 $3,456,594 260,090
2024-03-31 $638,850 59,428
2023-12-31 $1,842,192 197,237
2023-09-30 $1,086,762 144,133
2023-06-30 $1,959,880 143,581
2023-03-31 $491,066 53,031
2022-12-31 $1,068,000 100,850
2022-06-30 $593,121 66,793
2022-03-31 $1,249,666 94,600
2022-03-31 $584,714 44,263
2022-03-31 $2,474,233 187,300
2021-12-31 $3,979,500 227,400
2021-12-31 $2,672,774 152,730
2021-12-31 $2,026,500 115,800
2021-09-30 $3,192,000 114,000
2021-09-30 $4,410,000 157,500
2021-09-30 $4,405,520 157,340
2021-06-30 $8,067,456 238,400
2021-06-30 $5,688,504 168,100
2021-06-30 $4,670,359 138,013
2021-03-31 $20,068,503 482,300
2021-03-31 $11,857,101 284,958
2021-03-31 $10,697,931 257,100
2020-12-31 $9,449,834 307,712
2020-12-31 $19,626,761 639,100
2020-12-31 $6,049,870 197,000
2020-09-30 $232,734 33,487
2020-09-30 $1,506,065 216,700
2020-09-30 $558,085 80,300

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