Position in MGNI
as of Mar 31, 2026
· filed May 15, 2026
Position Value
$4,812,029
+$4,549,103 QoQ
Shares Held
405,053
+2400.3% QoQ
Ownership
0.283%
of shares outstanding
% of Portfolio
0.25%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Sep 2020
18 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
$0
CallShares
0
PutValue
$17,820,000
PutShares
1,500,000
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, 2026Caption Management, LLC holds $5,591,589 across 2 Advertising Agencies names. MGNI ranks #1 (86.1% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | MGNI |
Magnite, Inc.
This page
|
405,053 | $4,812,029 | |
| 2 | DV |
DoubleVerify Holdings, Inc.
|
82,059 | $779,560 |
All Filings in MGNI
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26 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $4,812,029 | 405,053 | Shares | Sole | 2026-05-15 | |
| 2026-03-31 | $17,820,000 | 1,500,000 | Put | Sole | 2026-05-15 | |
| 2025-12-31 | $262,926 | 16,200 | Shares | Sole | 2026-02-17 | |
| 2025-12-31 | $2,637,375 | 162,500 | Put | Sole | 2026-02-17 | |
| 2025-12-31 | $19,183,860 | 1,182,000 | Call | Sole | 2026-02-17 | |
| 2025-09-30 | $36,366,066 | 1,669,700 | Call | Sole | 2025-11-14 | |
| 2025-09-30 | $8,712,000 | 400,000 | Put | Sole | 2025-11-14 | |
| 2025-06-30 | $38,278,440 | 1,587,000 | Call | Sole | 2025-08-14 | |
| 2025-03-31 | $4,564,000 | 400,000 | Call | Sole | 2025-05-15 | |
| 2024-12-31 | $3,101,216 | 194,800 | Call | Sole | 2025-02-14 | |
| 2024-09-30 | $274,230 | 19,800 | Call | Sole | 2024-11-14 | |
| 2024-09-30 | $507,976 | 36,677 | Shares | Sole | 2024-11-14 | |
| 2024-06-30 | $332,250 | 25,000 | Call | Sole | 2024-08-14 | |
| 2024-03-31 | $268,750 | 25,000 | Call | Sole | 2024-05-15 | |
| 2023-12-31 | $108,792 | 11,648 | Shares | Sole | 2024-02-14 | |
| 2023-09-30 | $226,200 | 30,000 | Call | Sole | 2023-11-14 | |
| 2022-06-30 | $910,200 | 102,500 | Call | Sole | 2022-08-15 | |
| 2022-03-31 | $1,186,258 | 89,800 | Call | Sole | 2022-05-13 | |
| 2021-12-31 | $1,750,000 | 100,000 | Call | Sole | 2022-02-11 | |
| 2021-12-31 | $463,750 | 26,500 | Shares | Sole | 2022-02-11 | |
| 2021-06-30 | $169,200 | 5,000 | Call | Sole | 2021-08-16 | |
| 2021-06-30 | $162,432 | 4,800 | Shares | Sole | 2021-08-16 | |
| 2021-03-31 | $445,227 | 10,700 | Put | Sole | 2021-05-17 | |
| 2020-12-31 | $2,763,900 | 90,000 | Call | Sole | 2021-02-16 | |
| 2020-09-30 | $695,000 | 100,000 | Call | Sole | 2020-11-16 | |
| 2020-09-30 | $271,084 | 39,005 | Shares | Sole | 2020-11-16 | |
| No filing history on record for this holder in this stock. | ||||||