Position in MGNI
as of Mar 31, 2026
· filed May 14, 2026
Position Value
$33,240,667
-$12,009,156 QoQ
Shares Held
2,798,036
+0.4% QoQ
Ownership
1.95%
of shares outstanding
% of Portfolio
17.00%
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
$7,128,000
CallShares
600,000
PutValue
$0
PutShares
0
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, 2026Edenbrook Capital, LLC holds $55,970,455 across 2 Advertising Agencies names. MGNI ranks #1 (59.4% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | MGNI |
Magnite, Inc.
This page
|
2,798,036 | $33,240,667 | |
| 2 | MCHX |
Marchex Inc
|
14,664,380 | $22,729,788 |
All Filings in MGNI
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31 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $33,240,667 | 2,798,036 | Shares | Sole | 2026-05-14 | |
| 2026-03-31 | $7,128,000 | 600,000 | Call | Sole | 2026-05-14 | |
| 2025-12-31 | $45,249,823 | 2,788,036 | Shares | Defined | 2026-02-13 | |
| 2025-12-31 | $24,345,000 | 1,500,000 | Call | Sole | 2026-02-13 | |
| 2025-09-30 | $45,963,857 | 2,110,370 | Shares | Defined | 2025-11-13 | |
| 2025-06-30 | $87,072,524 | 3,609,972 | Shares | Sole | 2025-08-14 | |
| 2025-03-31 | $5,134,500 | 450,000 | Call | Sole | 2025-05-15 | |
| 2025-03-31 | $45,830,226 | 4,016,672 | Shares | Sole | 2025-05-15 | |
| 2024-12-31 | $7,960,000 | 500,000 | Call | Defined | 2025-02-14 | |
| 2024-12-31 | $49,408,388 | 3,103,542 | Shares | Defined | 2025-02-14 | |
| 2024-09-30 | $48,411,220 | 3,495,395 | Shares | Defined | 2024-11-13 | |
| 2024-06-30 | $1,993,500 | 150,000 | Call | Defined | 2024-08-13 | |
| 2024-06-30 | $61,120,709 | 4,599,000 | Shares | Defined | 2024-08-13 | |
| 2024-03-31 | $62,589,240 | 5,822,255 | Shares | Defined | 2024-05-15 | |
| 2023-12-31 | $54,624,036 | 5,848,398 | Shares | Defined | 2024-02-14 | |
| 2023-09-30 | $44,096,919 | 5,848,398 | Shares | Sole | 2023-11-14 | |
| 2023-06-30 | $81,245,018 | 5,952,016 | Shares | Sole | 2023-08-14 | |
| 2023-03-31 | $63,829,911 | 6,893,079 | Shares | Sole | 2023-05-12 | |
| 2022-12-31 | $72,997,706 | 6,893,079 | Shares | Sole | 2023-02-13 | |
| 2022-09-30 | $38,058,669 | 5,792,796 | Shares | Sole | 2022-11-10 | |
| 2022-06-30 | $36,934,015 | 4,159,236 | Shares | Sole | 2022-08-12 | |
| 2022-03-31 | $41,042,161 | 3,106,901 | Shares | Sole | 2022-05-13 | |
| 2021-12-31 | $35,000 | 2,000 | Call | Defined | 2022-02-11 | |
| 2021-12-31 | $48,377,280 | 2,764,416 | Shares | Sole | 2022-02-11 | |
| 2021-09-30 | $45,350,060 | 1,619,645 | Shares | Sole | 2021-11-12 | |
| 2021-06-30 | $38,239,200 | 1,130,000 | Put | Sole | 2021-08-13 | |
| 2021-06-30 | $44,838,000 | 1,325,000 | Shares | Sole | 2021-08-13 | |
| 2021-03-31 | $47,019,300 | 1,130,000 | Put | Sole | 2021-05-14 | |
| 2021-03-31 | $55,133,250 | 1,325,000 | Shares | Defined | 2021-05-14 | |
| 2020-12-31 | $55,804,246 | 1,817,136 | Shares | Defined | 2021-02-16 | |
| 2020-09-30 | $31,967,969 | 4,599,708 | Shares | Defined | 2020-11-16 | |
| No filing history on record for this holder in this stock. | ||||||