Magnite
MGNI
293 hedge funds and large institutions have $1.52B invested in Magnite in 2025 Q1 according to their latest regulatory filings, with 51 funds opening new positions, 104 increasing their positions, 98 reducing their positions, and 41 closing their positions.
24% more first-time investments, than exits
New positions opened: 51 | Existing positions closed: 41
5.23% more ownership
Funds ownership: 87.74% → 92.97% (+5.2%)
3% more funds holding
Funds holding: 285 → 293 (+8)
6% more repeat investments, than reductions
Existing positions increased: 104 | Existing positions reduced: 98
17% less call options, than puts
Call options by funds: $41.6M | Put options by funds: $50.1M
23% less capital invested
Capital invested by funds: $1.97B → $1.52B (-$450M)
30% less funds holding in top 10
Funds holding in top 10: 10 → 7 (-3)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Fidelity Investments
Boston,
Massachusetts
|
+$129M |
| 2 |
Capital Research Global Investors
Los Angeles,
California
|
+$82.8M |
| 3 |
American Century Companies
Kansas City,
Missouri
|
+$42.3M |
| 4 |
Pacer Advisors
Malvern,
Pennsylvania
|
+$17.6M |
| 5 |
EC
Edenbrook Capital
Mt. Kisco,
New York
|
+$14.6M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Wellington Management Group
Boston,
Massachusetts
|
-$18M |
| 2 |
Victory Capital Management
San Antonio,
Texas
|
-$16.9M |
| 3 |
GIM
Granahan Investment Management
Waltham,
Massachusetts
|
-$15.4M |
| 4 |
DCM
Driehaus Capital Management
Chicago,
Illinois
|
-$14.5M |
| 5 |
Marshall Wace
London,
United Kingdom
|
-$12.5M |
MGNI Hedge Fund Activity: Q1 2025 in Review
293 of the 7,458 institutional investors tracked by Wall St. Rank reported a position in Magnite (MGNI) for Q1 2025, worth a combined $1.52B — down 23% from $1.97B a quarter earlier.
Buyers outnumbered sellers: 51 funds opened new MGNI positions and 41 closed out — a net gain of 10 holders — while 104 added to existing stakes and 98 trimmed.
The largest buyer was Fidelity Investments, adding an estimated $129M. The largest seller was Wellington Management Group, cutting an estimated $18M.
- 293 institutional investors held Magnite (MGNI) as of Q1 2025, up from 285 in Q4 2024.
- Funds reported $1.52B of Magnite stock for Q1 2025, down 23% quarter-over-quarter.
- 51 funds opened new Magnite positions in Q1 2025 and 41 closed out, a net change of +10 holders.
- The largest Magnite buyer in Q1 2025 was Fidelity Investments, an estimated $129M added.
- The largest Magnite seller in Q1 2025 was Wellington Management Group, an estimated $18M sold.
Based on aggregated 13F filings for Q1 2025.