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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.

New
Increased
Maintained
Reduced
Closed

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)

Holders
414
Holders Change
+19
Holders Change %
+4.81%
% of All Funds
5.55%
Holding in Top 10
2
Holding in Top 10 Change
+1
Holding in Top 10 Change %
+100%
% of All Funds
0.03%
New
77
Increased
161
Reduced
131
Closed
54
Calls
$31M
Puts
$22M
Net Calls
+$9.02M
Net Calls Change
+$11.5M

Top Buyers

1
T. Rowe Price Associates
T. Rowe Price Associates
Maryland
+$194M
2
EIG
EdgePoint Investment Group
Ontario, Canada
+$68.7M
3
HRCM
Hood River Capital Management
Florida
+$55.5M
4
PWAM
Park West Asset Management
California
+$34.6M
5
SIC
Schwartz Investment Counsel
Michigan
+$22.3M

Top Sellers

1
Assenagon Asset Management
Assenagon Asset Management
Luxembourg
-$34.1M
2
JP Morgan Chase
JP Morgan Chase
New York
-$31.5M
3
Invesco
Invesco
Georgia
-$27.5M
4
Neuberger Berman Group
Neuberger Berman Group
New York
-$22.1M
5
Goldman Sachs
Goldman Sachs
New York
-$22.1M
Name Holding Trade Value Shares
Change 		Change in
Stake
BlackRock
1
BlackRock
New York
$737M +$5.73M +97,504 +0.7%
Vanguard Group
2
Vanguard Group
Pennsylvania
$644M -$8.96M -152,567 -1%
T. Rowe Price Associates
3
T. Rowe Price Associates
Maryland
$453M +$194M +3,297,728 +61%
State Street
4
State Street
Massachusetts
$237M -$9.21M -156,858 -3%
Invesco
5
Invesco
Georgia
$235M -$27.5M -467,722 -9%
JP Morgan Chase
6
JP Morgan Chase
New York
$189M -$31.5M -536,964 -13%
Geode Capital Management
7
Geode Capital Management
Massachusetts
$137M +$4.39M +74,762 +3%
Norges Bank
8
Norges Bank
Norway
$104M +$13.2M +224,484 +13%
Dimensional Fund Advisors
9
Dimensional Fund Advisors
Texas
$96.7M +$7.89M +134,246 +8%
Bank of New York Mellon
10
Bank of New York Mellon
New York
$92.4M -$18.3M -311,723 -15%
Swedbank
11
Swedbank
Sweden
$88M – – –
American Century Companies
12
American Century Companies
Missouri
$73.7M +$14.6M +248,013 +21%
Northern Trust
13
Northern Trust
Illinois
$73.6M -$2.51M -42,725 -3%
Neuberger Berman Group
14
Neuberger Berman Group
New York
$66.7M -$22.1M -376,196 -23%
Charles Schwab
15
Charles Schwab
California
$65M +$388K +6,600 +0.5%
WHG
16
Westwood Holdings Group
Texas
$63.8M +$6.13M +104,356 +9%
CAM
17
Congress Asset Management
Massachusetts
$62.1M +$19.6M +333,538 +39%
Wellington Management Group
18
Wellington Management Group
Massachusetts
$61.8M -$3.2M -54,399 -4%
EIG
19
EdgePoint Investment Group
Ontario, Canada
$60.5M +$68.7M +1,169,194 New
VOYA Investment Management
20
VOYA Investment Management
Georgia
$57.4M -$900K -15,326 -1%
N
21
Nuveen
North Carolina
$57.1M +$2.22M +37,849 +4%
Westfield Capital Management
22
Westfield Capital Management
Massachusetts
$56.4M -$17.6M -300,457 -22%
HRCM
23
Hood River Capital Management
Florida
$48.9M +$55.5M +944,894 New
Raymond James Financial
24
Raymond James Financial
Florida
$48.7M -$2.03M -34,572 -4%
Morgan Stanley
25
Morgan Stanley
New York
$48.6M +$1.37M +23,282 +3%
1
2 3 4 5

RMBS Hedge Fund Activity: Q1 2025 in Review

414 of the 7,457 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.