Magnite
MGNI
286 hedge funds and large institutions have $3.54B invested in Magnite in 2025 Q2 according to their latest regulatory filings, with 53 funds opening new positions, 99 increasing their positions, 98 reducing their positions, and 58 closing their positions.
134% more capital invested
Capital invested by funds: $1.52B → $3.54B (+$2.03B)
129% more funds holding in top 10
Funds holding in top 10: 7 → 16 (+9)
18% more call options, than puts
Call options by funds: $118M | Put options by funds: $100M
11.18% more ownership
Funds ownership: 92.97% → 104.15% (+11%)
1% more repeat investments, than reductions
Existing positions increased: 99 | Existing positions reduced: 98
9% less first-time investments, than exits
New positions opened: 53 | Existing positions closed: 58
2% less funds holding
Funds holding: 293 → 286 (-7)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Fidelity Investments
Boston,
Massachusetts
|
+$111M |
| 2 |
SSA
Schonfeld Strategic Advisors
New York
|
+$28M |
| 3 |
American Century Companies
Kansas City,
Missouri
|
+$27.5M |
| 4 |
FCM
Frontier Capital Management
Boston,
Massachusetts
|
+$21.3M |
| 5 |
ACA
Apis Capital Advisors
New York
|
+$15.4M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Qube Research & Technologies (QRT)
London,
United Kingdom
|
-$11.8M |
| 2 |
Nordea Investment Management
Stockholm,
Sweden
|
-$8.42M |
| 3 |
IECM
Intrinsic Edge Capital Management
Chicago,
Illinois
|
-$8.36M |
| 4 |
GIP
Granite Investment Partners
El Segundo,
California
|
-$8.23M |
| 5 |
Ameriprise
Minneapolis,
Minnesota
|
-$7.91M |
MGNI Hedge Fund Activity: Q2 2025 in Review
286 of the 7,613 institutional investors tracked by Wall St. Rank reported a position in Magnite (MGNI) for Q2 2025, worth a combined $3.54B — up 134% from $1.52B a quarter earlier.
Sellers outnumbered buyers: 58 funds closed out of MGNI and 53 opened new positions — a net loss of 5 holders — while 98 trimmed existing stakes and 99 added.
The largest buyer was Fidelity Investments, adding an estimated $111M. The largest seller was Qube Research & Technologies (QRT), exiting entirely with an estimated $11.8M sold.
- 286 institutional investors held Magnite (MGNI) as of Q2 2025, down from 293 in Q1 2025.
- Funds reported $3.54B of Magnite stock for Q2 2025, up 134% quarter-over-quarter.
- 53 funds opened new Magnite positions in Q2 2025 and 58 closed out, a net change of -5 holders.
- The largest Magnite buyer in Q2 2025 was Fidelity Investments, an estimated $111M added.
- The largest Magnite seller in Q2 2025 was Qube Research & Technologies (QRT), an estimated $11.8M sold.
Based on aggregated 13F filings for Q2 2025.