13F Insight
DOSSIER · 13F Holders · Q1 2026Technology · Semiconductors & Related DevicesMega-capCrowded
RMBS

RAMBUS INC DEL

576 institutions still hold RAMBUS INC DEL as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 750917106·Semiconductors & Related Devices·576 13F holders·last filed Mar 31, 2026
Market cap
—
▼ 5.7%
vs prior quarter
13F value held
$5.4B
54.0% inst. owned
of float
Holders
576
+30 QoQ
filers reporting
Activity
+72 / −120
+977 added · −947 reduced
this quarter
Concentration
25.79%
BlackRock, Inc. #1
top holder share
AI Holders Summary · Q1 2026

576 institutions reported RMBS in Q1 2026. BlackRock, Inc. leads at 25.8% of the visible book. +30 net new institutions vs prior quarter — accumulation reading.

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

#HolderValueShares% port.Quarter
01
BlackRock, Inc.
CIK 0002012383
$1.4B16.3M0.02%Q1 202602
Vanguard Portfolio Management
CIK 0002100121
$572M6.6M0.03%Q1 202603
Invesco Ltd.
CIK 0000914208
$559M6.5M0.09%Q1 202604
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$415M4.8M0.01%Q1 202605
STATE STREET CORP
CIK 0000093751
$376M4.4M0.01%Q1 202606
FMR LLC
CIK 0000315066
$285M3.3M0.01%Q1 202607
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$269M3.1M0.02%Q1 202608
EdgePoint Investment Group Inc.
CIK 0001481669
$168M1.9M1.34%Q1 202609
DIMENSIONAL FUND ADVISORS LP
CIK 0000354204· Quasi-passive
$154M1.8M0.03%Q1 202610
JPMORGAN CHASE & CO
CIK 0000019617
$146M1.8M0.01%Q1 202611
Swedbank AB
CIK 0000946431
$134M1.6M0.14%Q1 202612
BANK OF AMERICA CORP /DE/
CIK 0000070858
$117M1.4M0.01%Q1 202613
NORTHERN TRUST CORP
CIK 0000073124· Index
$115M1.3M0.02%Q1 202614
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
CIK 0000884546· Index
$114M1.3M0.02%Q1 202615
Neuberger Berman Group LLC
CIK 0001465109
$112M1.3M0.09%Q1 202616
CONGRESS ASSET MANAGEMENT CO
CIK 0000897378
$110M1.3M0.79%Q1 202617
MORGAN STANLEY
CIK 0000895421
$104M1.2M0.01%Q1 202618
AQR CAPITAL MANAGEMENT LLC
CIK 0001167557
$104M1.3M0.05%Q1 202619
BARCLAYS PLC
CIK 0000312069
$94M1.1M0.02%Q1 202620
CITIGROUP INC
CIK 0000831001
$87M1.0M0.04%Q1 2026
Page 1 of 29
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