Magnite
MGNI
311 hedge funds and large institutions have $2.69B invested in Magnite in 2026 Q2 according to their latest regulatory filings, with 55 funds opening new positions, 116 increasing their positions, 90 reducing their positions, and 37 closing their positions.
73% more capital inflows, than outflows
Capital inflows: $371M | Capital outflows: $214M
49% more first-time investments, than exits
New positions opened: 55 | Existing positions closed: 37
38% more funds holding in top 10
Funds holding in top 10: 8 → 11 (+3)
29% more repeat investments, than reductions
Existing positions increased: 116 | Existing positions reduced: 90
7.93% more ownership
Funds ownership: 91.13% → 99.07% (+7.9%)
5% more funds holding
Funds holding: 297 → 311 (+14)
7% more call options, than puts
Call options by funds: $85.8M | Put options by funds: $80.2M
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Fidelity Investments
Boston,
Massachusetts
|
+$46.6M |
| 2 |
Canada Pension Plan Investment Board
Toronto Ontario,
Ontario, Canada
|
+$42.2M |
| 3 |
3C
325 Capital
New York
|
+$20.2M |
| 4 |
PWAM
Park West Asset Management
San Francisco,
California
|
+$20.1M |
| 5 |
Qube Research & Technologies (QRT)
London,
United Kingdom
|
+$18.6M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Wellington Management Group
Boston,
Massachusetts
|
-$45.1M |
| 2 |
NSGL
No Street GP LP
San Francisco,
California
|
-$19.3M |
| 3 |
Capital Research Global Investors
Los Angeles,
California
|
-$16.5M |
| 4 |
SSA
Schonfeld Strategic Advisors
New York
|
-$14.9M |
| 5 |
Balyasny Asset Management
Chicago,
Illinois
|
-$11.9M |
MGNI Hedge Fund Activity: Q2 2026 in Review
311 of the 8,352 institutional investors tracked by Wall St. Rank reported a position in Magnite (MGNI) for Q2 2026, worth a combined $2.69B — up 72% from $1.56B a quarter earlier.
Buyers outnumbered sellers: 55 funds opened new MGNI positions and 37 closed out — a net gain of 18 holders — while 116 added to existing stakes and 90 trimmed.
The largest buyer was Fidelity Investments, adding an estimated $46.6M. The largest seller was Wellington Management Group, cutting an estimated $45.1M.
- 311 institutional investors held Magnite (MGNI) as of Q2 2026, up from 297 in Q1 2026.
- Funds reported $2.69B of Magnite stock for Q2 2026, up 72% quarter-over-quarter.
- 55 funds opened new Magnite positions in Q2 2026 and 37 closed out, a net change of +18 holders.
- The largest Magnite buyer in Q2 2026 was Fidelity Investments, an estimated $46.6M added.
- The largest Magnite seller in Q2 2026 was Wellington Management Group, an estimated $45.1M sold.
Based on aggregated 13F filings for Q2 2026.