Rambus
RMBS
617 hedge funds and large institutions have $13.3B invested in Rambus in 2026 Q2 according to their latest regulatory filings, with 135 funds opening new positions, 189 increasing their positions, 228 reducing their positions, and 66 closing their positions.
105% more first-time investments, than exits
New positions opened: 135 | Existing positions closed: 66
92% more call options, than puts
Call options by funds: $300M | Put options by funds: $156M
51% more capital invested
Capital invested by funds: $8.83B → $13.3B (+$4.47B)
11% more funds holding
Funds holding: 557 → 617 (+60)
0% more funds holding in top 10
Funds holding in top 10: 2 → 2 (0)
2% less ownership
Funds ownership: 95.04% → 93.04% (-2%)
17% less repeat investments, than reductions
Existing positions increased: 189 | Existing positions reduced: 228
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Fidelity Investments
Boston,
Massachusetts
|
+$929M |
| 2 |
D.E. Shaw & Co
New York
|
+$94.5M |
| 3 |
Manulife (Manufacturers Life Insurance)
Canada,
Ontario, Canada
|
+$90.4M |
| 4 |
Susquehanna International Group
Bala Cynwyd,
Pennsylvania
|
+$61.1M |
| 5 |
HF
HRT Financial
New York
|
+$55.1M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
BlackRock
New York
|
-$304M |
| 2 |
T. Rowe Price Investment Management
Baltimore,
Maryland
|
-$206M |
| 3 |
EIG
EdgePoint Investment Group
Toronto,
Ontario, Canada
|
-$112M |
| 4 |
Geode Capital Management
Boston,
Massachusetts
|
-$108M |
| 5 |
VOYA Investment Management
Atlanta,
Georgia
|
-$86.6M |
RMBS Hedge Fund Activity: Q2 2026 in Review
617 of the 8,305 institutional investors tracked by Wall St. Rank reported a position in Rambus (RMBS) for Q2 2026, worth a combined $13.3B — up 51% from $8.83B a quarter earlier.
Buyers outnumbered sellers: 135 funds opened new RMBS positions and 66 closed out — a net gain of 69 holders — while 189 added to existing stakes and 228 trimmed.
The largest buyer was Fidelity Investments, adding an estimated $929M. The largest seller was BlackRock, cutting an estimated $304M.
- 617 institutional investors held Rambus (RMBS) as of Q2 2026, up from 557 in Q1 2026.
- Funds reported $13.3B of Rambus stock for Q2 2026, up 51% quarter-over-quarter.
- 135 funds opened new Rambus positions in Q2 2026 and 66 closed out, a net change of +69 holders.
- The largest Rambus buyer in Q2 2026 was Fidelity Investments, an estimated $929M added.
- The largest Rambus seller in Q2 2026 was BlackRock, an estimated $304M sold.
Based on aggregated 13F filings for Q2 2026.