Position in MGNI
as of Mar 31, 2026
· filed May 15, 2026
Position Value
$12,508,546
+$3,674,266 QoQ
Shares Held
1,052,908
+93.4% QoQ
Ownership
0.735%
of shares outstanding
% of Portfolio
0.01%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Sep 2020
23 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, 2026CallValue
$1,242,648
CallShares
104,600
PutValue
$12,355,200
PutShares
1,040,000
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, 2026CITADEL ADVISORS LLC holds $267,743,915 across 22 Advertising Agencies names. MGNI ranks #5 (4.7% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | OMC |
Omnicom Group Inc.
|
1,245,356 | $93,787,759 | |
| 2 | TTD |
Trade Desk, Inc.
|
3,369,706 | $76,458,629 | |
| 3 | APP |
AppLovin Corp
|
133,261 | $53,037,878 | |
| 4 | DV |
DoubleVerify Holdings, Inc.
|
1,573,582 | $14,949,029 | |
| 5 | MGNI |
Magnite, Inc.
This page
|
1,052,908 | $12,508,546 | |
| 6 | WPP |
WPP plc
|
283,401 | $4,406,885 | |
| 7 | ZD |
Ziff Davis, Inc.
|
72,480 | $3,041,260 | |
| 8 | CCO |
Clear Channel Outdoor Holdings, Inc.
|
1,213,449 | $2,875,874 |
All Filings in MGNI
Export CSV
50 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $12,508,546 | 1,052,908 | Shares | Defined | 2026-05-15 | |
| 2026-03-31 | $12,355,200 | 1,040,000 | Put | Defined | 2026-05-15 | |
| 2026-03-31 | $1,242,648 | 104,600 | Call | Defined | 2026-05-15 | |
| 2025-12-31 | $7,111,986 | 438,200 | Call | Defined | 2026-02-17 | |
| 2025-12-31 | $8,834,280 | 544,318 | Shares | Defined | 2026-02-17 | |
| 2025-12-31 | $12,338,046 | 760,200 | Put | Defined | 2026-02-17 | |
| 2025-09-30 | $10,652,598 | 489,100 | Put | Defined | 2025-11-14 | |
| 2025-09-30 | $7,187,400 | 330,000 | Call | Defined | 2025-11-14 | |
| 2025-09-30 | $3,693,038 | 169,561 | Shares | Defined | 2025-11-14 | |
| 2025-06-30 | $3,531,168 | 146,400 | Call | Defined | 2025-08-14 | |
| 2025-06-30 | $20,142,659 | 835,102 | Shares | Defined | 2025-08-14 | |
| 2025-06-30 | $15,313,788 | 634,900 | Put | Defined | 2025-08-14 | |
| 2025-03-31 | $4,155,522 | 364,200 | Put | Defined | 2025-05-15 | |
| 2025-03-31 | $2,536,443 | 222,300 | Call | Defined | 2025-05-15 | |
| 2025-03-31 | $6,765,319 | 592,929 | Shares | Defined | 2025-05-15 | |
| 2024-12-31 | $5,560,856 | 349,300 | Call | Defined | 2025-02-14 | |
| 2024-12-31 | $4,939,004 | 310,239 | Shares | Defined | 2025-02-14 | |
| 2024-12-31 | $3,142,608 | 197,400 | Put | Defined | 2025-02-14 | |
| 2024-09-30 | $1,673,080 | 120,800 | Put | Defined | 2024-11-14 | |
| 2024-09-30 | $6,936,080 | 500,800 | Call | Defined | 2024-11-14 | |
| 2024-09-30 | $9,729,735 | 702,508 | Shares | Defined | 2024-11-14 | |
| 2024-06-30 | $984,789 | 74,100 | Put | Defined | 2024-08-14 | |
| 2024-06-30 | $3,846,910 | 289,459 | Shares | Defined | 2024-08-14 | |
| 2024-06-30 | $3,512,547 | 264,300 | Call | Defined | 2024-08-14 | |
| 2024-03-31 | $1,742,575 | 162,100 | Call | Defined | 2024-05-15 | |
| 2024-03-31 | $451,500 | 42,000 | Put | Defined | 2024-05-15 | |
| 2024-03-31 | $4,480,234 | 416,766 | Shares | Defined | 2024-05-15 | |
| 2023-12-31 | $414,696 | 44,400 | Put | Defined | 2024-02-14 | |
| 2023-12-31 | $2,547,952 | 272,800 | Call | Defined | 2024-02-14 | |
| 2023-12-31 | $3,553,486 | 380,459 | Shares | Defined | 2024-02-14 | |
| 2023-09-30 | $371,722 | 49,300 | Put | Defined | 2023-11-14 | |
| 2023-09-30 | $2,478,398 | 328,700 | Call | Defined | 2023-11-14 | |
| 2023-09-30 | $4,175,281 | 553,751 | Shares | Defined | 2023-11-14 | |
| 2023-06-30 | $1,235,325 | 90,500 | Put | Defined | 2023-08-14 | |
| 2023-06-30 | $3,961,584 | 290,226 | Shares | Defined | 2023-08-14 | |
| 2023-06-30 | $6,199,830 | 454,200 | Call | Defined | 2023-08-14 | |
| 2023-03-31 | $2,304,814 | 248,900 | Call | Defined | 2023-05-15 | |
| 2023-03-31 | $8,008,612 | 864,861 | Shares | Defined | 2023-05-15 | |
| 2023-03-31 | $1,275,102 | 137,700 | Put | Defined | 2023-05-15 | |
| 2022-12-31 | $851,436 | 80,400 | Put | Defined | 2023-02-14 | |
| 2022-12-31 | $6,776,021 | 639,851 | Shares | Defined | 2023-02-14 | |
| 2022-12-31 | $3,657,786 | 345,400 | Call | Defined | 2023-02-14 | |
| 2022-09-30 | $385,659 | 58,700 | Put | Defined | 2022-11-14 | |
| 2022-09-30 | $1,296,261 | 197,300 | Call | Defined | 2022-11-14 | |
| 2022-09-30 | $5,676,669 | 864,029 | Shares | Defined | 2022-11-14 | |
| 2022-06-30 | $13,074,920 | 1,472,401 | Shares | Defined | 2022-08-15 | |
| 2022-06-30 | $1,194,360 | 134,500 | Call | Defined | 2022-08-15 | |
| 2022-06-30 | $941,280 | 106,000 | Put | Defined | 2022-08-15 | |
| 2022-03-31 | $1,844,116 | 139,600 | Call | Defined | 2022-05-16 | |
| 2022-03-31 | $1,787,313 | 135,300 | Put | Defined | 2022-05-16 | |
| No filing history on record for this holder in this stock. | ||||||