Position in MGNI
as of Mar 31, 2026
· filed May 14, 2026
Position Value
$134,434
-$4,139,931 QoQ
Shares Held
11,316
-95.7% QoQ
Ownership
0.008%
of shares outstanding
% of Portfolio
0.00%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Sep 2020
16 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)
Position in Advertising Agencies
Communication Services · as of Mar 31, 2026SIMPLEX TRADING, LLC holds $6,951,823 across 8 Advertising Agencies names. MGNI ranks #5 (1.9% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | APP |
AppLovin Corp
|
7,614 | $3,030,372 | |
| 2 | TTD |
Trade Desk, Inc.
|
126,533 | $2,871,033 | |
| 3 | WPP |
WPP plc
|
38,530 | $599,141 | |
| 4 | STGW |
Stagwell Inc
|
29,150 | $183,353 | |
| 5 | MGNI |
Magnite, Inc.
This page
|
11,316 | $134,434 | |
| 6 | CDLX |
Cardlytics, Inc.
|
69,396 | $72,865 | |
| 7 | EVC |
Entravision Communications Corp
|
20,002 | $59,405 | |
| 8 | NCMI |
National CineMedia, Inc.
|
400 | $1,220 |
All Filings in MGNI
Export CSV
16 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $134,434 | 11,316 | Shares | Sole | 2026-05-14 | |
| 2025-12-31 | $4,274,365 | 263,362 | Shares | Sole | 2026-02-11 | |
| 2025-09-30 | $2,549,240 | 117,045 | Shares | Sole | 2025-11-12 | |
| 2025-06-30 | $1,274,356 | 52,834 | Shares | Sole | 2025-08-05 | |
| 2024-12-31 | $509,233 | 31,987 | Shares | Sole | 2025-02-11 | |
| 2024-09-30 | $1,221,002 | 88,159 | Shares | Sole | 2024-11-08 | |
| 2024-06-30 | $99,993 | 7,524 | Shares | Sole | 2024-07-25 | |
| 2023-06-30 | $328,378 | 24,057 | Shares | Sole | 2023-08-04 | |
| 2023-03-31 | $108,592 | 11,727 | Shares | Sole | 2023-04-27 | |
| 2022-12-31 | $417,542 | 39,428 | Shares | Sole | 2023-02-02 | |
| 2022-06-30 | $271,639 | 30,590 | Shares | Sole | 2022-08-03 | |
| 2022-03-31 | $763,141 | 57,770 | Shares | Sole | 2022-05-02 | |
| 2021-12-31 | $1,320,777 | 75,473 | Shares | Sole | 2022-02-23 | |
| 2021-03-31 | $2,058,405 | 49,469 | Shares | Sole | 2021-04-26 | |
| 2020-12-31 | $1,083,940 | 35,296 | Shares | Sole | 2021-02-02 | |
| 2020-09-30 | $314,869 | 45,305 | Shares | Sole | 2020-10-14 | |
| No filing history on record for this holder in this stock. | ||||||