Rambus
RMBS
414 hedge funds and large institutions have $5.15B invested in Rambus in 2025 Q1 according to their latest regulatory filings, with 77 funds opening new positions, 161 increasing their positions, 131 reducing their positions, and 54 closing their positions.
100% more funds holding in top 10
Funds holding in top 10: 1 → 2 (+1)
43% more first-time investments, than exits
New positions opened: 77 | Existing positions closed: 54
41% more call options, than puts
Call options by funds: $31M | Put options by funds: $22M
23% more repeat investments, than reductions
Existing positions increased: 161 | Existing positions reduced: 131
5% more funds holding
Funds holding: 395 → 414 (+19)
2.41% more ownership
Funds ownership: 89.19% → 91.6% (+2.4%)
2% more capital invested
Capital invested by funds: $5.03B → $5.15B (+$122M)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
T. Rowe Price Associates
Baltimore,
Maryland
|
+$194M |
| 2 |
EIG
EdgePoint Investment Group
Toronto,
Ontario, Canada
|
+$68.7M |
| 3 |
HRCM
Hood River Capital Management
Palm Beach Gardens,
Florida
|
+$55.5M |
| 4 |
PWAM
Park West Asset Management
San Francisco,
California
|
+$34.6M |
| 5 |
SIC
Schwartz Investment Counsel
Plymouth,
Michigan
|
+$22.3M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Assenagon Asset Management
Senningerberg,
Luxembourg
|
-$34.1M |
| 2 |
JP Morgan Chase
New York
|
-$31.5M |
| 3 |
Invesco
Atlanta,
Georgia
|
-$27.5M |
| 4 |
Neuberger Berman Group
New York
|
-$22.1M |
| 5 |
Goldman Sachs
New York
|
-$22.1M |
RMBS Hedge Fund Activity: Q1 2025 in Review
414 of the 7,458 institutional investors tracked by Wall St. Rank reported a position in Rambus (RMBS) for Q1 2025, worth a combined $5.15B — up 2.4% from $5.03B a quarter earlier.
Buyers outnumbered sellers: 77 funds opened new RMBS positions and 54 closed out — a net gain of 23 holders — while 161 added to existing stakes and 131 trimmed.
The largest buyer was T. Rowe Price Associates, adding an estimated $194M. The largest seller was Assenagon Asset Management, cutting an estimated $34.1M.
- 414 institutional investors held Rambus (RMBS) as of Q1 2025, up from 395 in Q4 2024.
- Funds reported $5.15B of Rambus stock for Q1 2025, up 2.4% quarter-over-quarter.
- 77 funds opened new Rambus positions in Q1 2025 and 54 closed out, a net change of +23 holders.
- The largest Rambus buyer in Q1 2025 was T. Rowe Price Associates, an estimated $194M added.
- The largest Rambus seller in Q1 2025 was Assenagon Asset Management, an estimated $34.1M sold.
Based on aggregated 13F filings for Q1 2025.