Ambarella
AMBA
329 hedge funds and large institutions have $2.93B invested in Ambarella in 2025 Q3 according to their latest regulatory filings, with 66 funds opening new positions, 113 increasing their positions, 105 reducing their positions, and 39 closing their positions.
88% more call options, than puts
Call options by funds: $198M | Put options by funds: $105M
69% more first-time investments, than exits
New positions opened: 66 | Existing positions closed: 39
26% more capital invested
Capital invested by funds: $2.32B → $2.93B (+$613M)
8% more funds holding
Funds holding: 304 → 329 (+25)
8% more repeat investments, than reductions
Existing positions increased: 113 | Existing positions reduced: 105
0.47% more ownership
Funds ownership: 82.84% → 83.3% (+0.47%)
67% less funds holding in top 10
Funds holding in top 10: 6 → 2 (-4)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
UBS Group
Zurich,
Switzerland
|
+$47.2M |
| 2 |
Barclays
London,
United Kingdom
|
+$30.9M |
| 3 |
DCM
Driehaus Capital Management
Chicago,
Illinois
|
+$27.7M |
| 4 |
BNP Paribas Financial Markets
Paris,
France
|
+$15M |
| 5 |
Arrowstreet Capital
Boston,
Massachusetts
|
+$14.8M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Manulife (Manufacturers Life Insurance)
Canada,
Ontario, Canada
|
-$37.6M |
| 2 |
Citadel Advisors
Miami,
Florida
|
-$35.6M |
| 3 |
Axa
Paris,
France
|
-$23.6M |
| 4 |
Baillie Gifford & Co
Edinburgh,
United Kingdom
|
-$17.1M |
| 5 |
Assenagon Asset Management
Senningerberg,
Luxembourg
|
-$17M |
AMBA Hedge Fund Activity: Q3 2025 in Review
329 of the 7,638 institutional investors tracked by Wall St. Rank reported a position in Ambarella (AMBA) for Q3 2025, worth a combined $2.93B — up 26% from $2.32B a quarter earlier.
Buyers outnumbered sellers: 66 funds opened new AMBA positions and 39 closed out — a net gain of 27 holders — while 113 added to existing stakes and 105 trimmed.
The largest buyer was UBS Group, adding an estimated $47.2M. The largest seller was Manulife (Manufacturers Life Insurance), cutting an estimated $37.6M.
- 329 institutional investors held Ambarella (AMBA) as of Q3 2025, up from 304 in Q2 2025.
- Funds reported $2.93B of Ambarella stock for Q3 2025, up 26% quarter-over-quarter.
- 66 funds opened new Ambarella positions in Q3 2025 and 39 closed out, a net change of +27 holders.
- The largest Ambarella buyer in Q3 2025 was UBS Group, an estimated $47.2M added.
- The largest Ambarella seller in Q3 2025 was Manulife (Manufacturers Life Insurance), an estimated $37.6M sold.
Based on aggregated 13F filings for Q3 2025.