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CITADEL ADVISORS LLC

Position in MGNI — Magnite, Inc.

CIK 1423053 MIAMI, FL

Position in MGNI

as of Jun 30, 2026 · filed Aug 14, 2026
Position Value
$8,974,977
-$3,533,569 QoQ
Shares Held
472,865
-55.1% QoQ
Ownership
0.330%
of shares outstanding
% of Portfolio
0.01%
of 13F equity value
Holder Rank
#53
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 Jun 30, 2026
CallValue
$6,413,342
CallShares
337,900
PutValue
$22,174,334
PutShares
1,168,300

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 Jun 30, 2026

CITADEL ADVISORS LLC holds $352,974,003 across 25 Advertising Agencies names. MGNI ranks #5 (2.5% of the industry book) .

# Ticker Company Shares Value (USD) Open
5 MGNI
Magnite, Inc.
This page
472,865 $8,974,977

All Filings in MGNI

Export CSV
50 filing rows on record
Report Date Value (USD) Shares
2026-06-30 $8,974,977 472,865
2026-06-30 $22,174,334 1,168,300
2026-06-30 $6,413,342 337,900
2026-03-31 $12,508,546 1,052,908
2026-03-31 $12,355,200 1,040,000
2026-03-31 $1,242,648 104,600
2025-12-31 $7,111,986 438,200
2025-12-31 $8,834,280 544,318
2025-12-31 $12,338,046 760,200
2025-09-30 $10,652,598 489,100
2025-09-30 $7,187,400 330,000
2025-09-30 $3,693,038 169,561
2025-06-30 $3,531,168 146,400
2025-06-30 $20,142,659 835,102
2025-06-30 $15,313,788 634,900
2025-03-31 $4,155,522 364,200
2025-03-31 $2,536,443 222,300
2025-03-31 $6,765,319 592,929
2024-12-31 $5,560,856 349,300
2024-12-31 $4,939,004 310,239
2024-12-31 $3,142,608 197,400
2024-09-30 $1,673,080 120,800
2024-09-30 $6,936,080 500,800
2024-09-30 $9,729,735 702,508
2024-06-30 $984,789 74,100
2024-06-30 $3,846,910 289,459
2024-06-30 $3,512,547 264,300
2024-03-31 $1,742,575 162,100
2024-03-31 $451,500 42,000
2024-03-31 $4,480,234 416,766
2023-12-31 $414,696 44,400
2023-12-31 $2,547,952 272,800
2023-12-31 $3,553,486 380,459
2023-09-30 $371,722 49,300
2023-09-30 $2,478,398 328,700
2023-09-30 $4,175,281 553,751
2023-06-30 $1,235,325 90,500
2023-06-30 $3,961,584 290,226
2023-06-30 $6,199,830 454,200
2023-03-31 $2,304,814 248,900
2023-03-31 $8,008,612 864,861
2023-03-31 $1,275,102 137,700
2022-12-31 $851,436 80,400
2022-12-31 $6,776,021 639,851
2022-12-31 $3,657,786 345,400
2022-09-30 $385,659 58,700
2022-09-30 $1,296,261 197,300
2022-09-30 $5,676,669 864,029
2022-06-30 $13,074,920 1,472,401
2022-06-30 $1,194,360 134,500