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Rambus
RMBS

513 hedge funds and large institutions have $10.3B invested in Rambus in 2025 Q3 according to their latest regulatory filings, with 123 funds opening new positions, 169 increasing their positions, 163 reducing their positions, and 62 closing their positions.

New
Increased
Maintained
Reduced
Closed

500% more funds holding in top 10

Funds holding in top 10: 1 → 6 (+5)

98% more first-time investments, than exits

New positions opened: 123 | Existing positions closed: 62

65% more capital invested

Capital invested by funds: $6.22B → $10.3B (+$4.07B)

63% more call options, than puts

Call options by funds: $155M | Put options by funds: $94.8M

12% more funds holding

Funds holding: 459 → 513 (+54)

1.36% more ownership

Funds ownership: 90.43% → 91.78% (+1.4%)

4% more repeat investments, than reductions

Existing positions increased: 169 | Existing positions reduced: 163

Holders
513
Holders Change
+54
Holders Change %
+11.76%
% of All Funds
6.73%
Holding in Top 10
6
Holding in Top 10 Change
+5
Holding in Top 10 Change %
+500%
% of All Funds
0.08%
New
123
Increased
169
Reduced
163
Closed
62
Calls
$155M
Puts
$94.8M
Net Calls
+$60M
Net Calls Change
+$90M

Top Buyers

Rank Fund Capital Flow
1
AllianceBernstein
AllianceBernstein
Tennessee
+$120M
2
Fidelity Investments
Fidelity Investments
Massachusetts
+$79.8M
3
Bank of America
Bank of America
North Carolina
+$79.2M
4
Rafferty Asset Management
Rafferty Asset Management
New York
+$69.5M
5
BlackRock
BlackRock
New York
+$62.3M

Top Sellers

Rank Fund Capital Flow
1
WHG
Westwood Holdings Group
Texas
-$116M
2
Assenagon Asset Management
Assenagon Asset Management
Luxembourg
-$60.7M
3
JP Morgan Chase
JP Morgan Chase
New York
-$48.1M
4
PWAM
Park West Asset Management
California
-$42.3M
5
Westfield Capital Management
Westfield Capital Management
Massachusetts
-$36.8M
Name Holding Trade Value Shares
Change 		Change in
Stake
WT
476
Whittier Trust
California
$4.6K +$3.55K +46 New
S
477
Sachetta
Massachusetts
$4.38K – – –
MG
478
Mather Group
Illinois
$3.44K +$2.54K +33 New
AW
479
Avion Wealth
Texas
$3K -$77 -1 -3%
TFA
480
Toth Financial Advisory
Virginia
$2.92K – – –
MCM
481
MV Capital Management
Maryland
$2.81K – – –
CT
482
Clearstead Trust
Maine
$2.6K – – –
HNW
483
High Note Wealth
Minnesota
$2.6K – – –
MCM
484
Manchester Capital Management
Vermont
$2.19K +$1.62K +21 New
BWL
485
Bogart Wealth LLC
Virginia
$2.19K – – –
CIAS
486
CBIZ Investment Advisory Services
Ohio
$2.19K +$1.62K +21 New
BC
487
Barrett & Company
Rhode Island
$2.08K +$1.54K +20 New
LWMI
488
Legacy Wealth Management (Idaho)
Idaho
$1.67K -$1.31K -17 -52%
AWM
489
Activest Wealth Management
Florida
$1.67K – – –
JWM
490
JPL Wealth Management
Colorado
$1.56K +$1.16K +15 New
BFS
491
Bare Financial Services
Pennsylvania
$1.46K – – –
CFD
492
Creative Financial Designs
Indiana
$1.46K – – –
MAM
493
Marquette Asset Management
Minnesota
$1.46K +$1.08K +14 New
HFS
494
Hughes Financial Services
Virginia
$1.44K – – –
MA
495
Montag & Associates
Georgia
$1.25K +$925 +12 New
CFO
496
CVA Family Office
Colorado
$1.25K – – –
SL
497
Salomon & Ludwin
Virginia
$1.2K +$925 +12 New
FMP
498
Financial Management Professionals
Texas
$1.15K – – –
QC
499
Quent Capital
New York
$1.15K +$848 +11 New
PWMG
500
Prestige Wealth Management Group
New Jersey
$1.04K – – –
18 19
20
21 22

RMBS Hedge Fund Activity: Q3 2025 in Review

513 of the 7,620 institutional investors tracked by Wall St. Rank reported a position in Rambus (RMBS) for Q3 2025, worth a combined $10.3B — up 65% from $6.22B a quarter earlier.

Buyers outnumbered sellers: 123 funds opened new RMBS positions and 62 closed out — a net gain of 61 holders — while 169 added to existing stakes and 163 trimmed.

The largest buyer was AllianceBernstein, adding an estimated $120M. The largest seller was Westwood Holdings Group, cutting an estimated $116M.

  • 513 institutional investors held Rambus (RMBS) as of Q3 2025, up from 459 in Q2 2025.
  • Funds reported $10.3B of Rambus stock for Q3 2025, up 65% quarter-over-quarter.
  • 123 funds opened new Rambus positions in Q3 2025 and 62 closed out, a net change of +61 holders.
  • The largest Rambus buyer in Q3 2025 was AllianceBernstein, an estimated $120M added.
  • The largest Rambus seller in Q3 2025 was Westwood Holdings Group, an estimated $116M sold.

Based on aggregated 13F filings for Q3 2025.