Magnite
MGNI
297 hedge funds and large institutions have $1.56B invested in Magnite in 2026 Q1 according to their latest regulatory filings, with 52 funds opening new positions, 114 increasing their positions, 80 reducing their positions, and 54 closing their positions.
43% more repeat investments, than reductions
Existing positions increased: 114 | Existing positions reduced: 80
4% less first-time investments, than exits
New positions opened: 52 | Existing positions closed: 54
2% less funds holding
Funds holding: 304 → 297 (-7)
4.02% less ownership
Funds ownership: 95.15% → 91.13% (-4%)
10% less funds holding in top 10
Funds holding in top 10: 10 → 9 (-1)
30% less capital invested
Capital invested by funds: $2.22B → $1.56B (-$655M)
49% less call options, than puts
Call options by funds: $26.7M | Put options by funds: $52.5M
Top Buyers
| 1 |
Jane Street
New York
|
+$17.3M |
| 2 |
Millennium Management
New York
|
+$16.2M |
| 3 |
Victory Capital Management
San Antonio,
Texas
|
+$15M |
| 4 |
SSA
Schonfeld Strategic Advisors
New York
|
+$11.1M |
| 5 |
GC
Grizzlyrock Capital
Chicago,
Illinois
|
+$8.94M |
Top Sellers
MGNI Hedge Fund Activity: Q1 2026 in Review
297 of the 8,125 institutional investors tracked by Wall St. Rank reported a position in Magnite (MGNI) for Q1 2026, worth a combined $1.56B — down 30% from $2.22B a quarter earlier.
Sellers outnumbered buyers: 54 funds closed out of MGNI and 52 opened new positions — a net loss of 2 holders — while 80 trimmed existing stakes and 114 added.
The largest buyer was Jane Street, adding an estimated $17.3M. The largest seller was Capital Research Global Investors, cutting an estimated $106M.
- 297 institutional investors held Magnite (MGNI) as of Q1 2026, down from 304 in Q4 2025.
- Funds reported $1.56B of Magnite stock for Q1 2026, down 30% quarter-over-quarter.
- 52 funds opened new Magnite positions in Q1 2026 and 54 closed out, a net change of -2 holders.
- The largest Magnite buyer in Q1 2026 was Jane Street, an estimated $17.3M added.
- The largest Magnite seller in Q1 2026 was Capital Research Global Investors, an estimated $106M sold.
Based on aggregated 13F filings for Q1 2026.