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RMBS — RAMBUS INC DEL

Reported value held$8.06B
Funds holding (latest)51
SectorTechnology
Funds holding (Q2 2026)37
Institutional value$6.72B · 54.14M sh
New / Add / Cut / Exit1 / 14 / 22 / 3
Top-5 / Top-10 concentration69.8% / 82.5%
Institutional holdings change Accumulating +16.0% (+7.48M sh)
Institutional value change Up +80.6%

As of Q2 2026, 37 SEC-registered investment managers reported holding RMBS (RAMBUS INC DEL) in their latest 13F filings, with a combined reported value of $6.72B across 54.14M shares. That is +16.0% by share count (+7.48M shares) versus the previous quarter, while reported value moved +80.6%. Ownership is concentrated: the five largest holders account for 69.8% of reported value and the top ten for 82.5%.

Compared with the prior quarter, 1 opened new positions, 14 added to existing stakes, 22 trimmed, 3 exited entirely. 13F holdings are quarter-end snapshots, so these moves reflect positioning as of Q2 2026, not real-time trading.

RMBS is classified in the Technology sector.

All figures on this page are computed from SEC Form 13F quarterly filings. 13F filers disclose long positions of $100,000 or more within 45 days of quarter end; short positions, options overlays and intra-quarter trades are not included, so treat the numbers as a quarterly snapshot of institutional ownership rather than real-time positioning.

FundQuarterSharesValuePortfolio WeightChange
BlackRock Inc history Q2 2026 13.96M $1.85B 0.03% Reduce
Fidelity Management & Research (FMR) history Q2 2026 10.46M $1.39B 0.07% Add
Vanguard Group history Q4 2025 12.29M $1.13B 0.02% Reduce
Invesco Ltd history Q2 2026 6.63M $880.39M 0.07% Add
Geode Capital Management history Q2 2026 2.30M $305.06M 0.02% Reduce
JPMorgan Chase & Co history Q2 2026 2.10M $260.99M 0.03% New
Norges Bank Investment Management history Q2 2026 1.53M $203.44M 0.02% Reduce
Morgan Stanley history Q2 2026 1.44M $191.71M 0.01% Add
Bank of America Corp history Q2 2026 1.22M $161.77M 0.01% Reduce
AQR Capital Management history Q2 2026 1.21M $152.48M 0.05% Reduce
Charles Schwab Investment Management history Q2 2026 1.11M $147.23M 0.02% Reduce
Goldman Sachs Group history Q2 2026 960.88K $127.55M 0.01% Add
Northern Trust Corp history Q2 2026 949.11K $125.99M 0.01% Reduce
Citadel Advisors history Q2 2026 877.75K $116.51M 0.01% Add
BNY Mellon history Q2 2026 828.23K $109.94M 0.02% Add
Manulife Financial history Q2 2026 797.20K $105.82M 0.09% Add
Whale Rock Capital Management history Q3 2023 1.89M $105.17M 2.19% Add
D. E. Shaw & Co history Q2 2026 739.70K $98.19M 0.05% Add
Citigroup Inc history Q2 2026 532.40K $70.67M 0.03% Reduce
Millennium Management history Q2 2026 513.72K $68.19M 0.03% Add

View all 51 fund holders →

New Positions (Q2 2026)

Fully Exited (vs previous quarter)

Fund Position History — shares by quarter (top 20 funds)

FundQ3 2021Q4 2021Q1 2022Q2 2022Q3 2022Q4 2022Q1 2023Q2 2023Q3 2023Q4 2023Q1 2024Q2 2024Q3 2024Q4 2024Q1 2025Q2 2025Q3 2025Q4 2025Q1 2026Q2 2026
BlackRock Inc — — — — — — — — — — — — 13.69M 14.14M 14.24M 15.00M 15.81M 16.28M 16.31M 13.96M
Fidelity Management & Research (FMR) 154 154 3.72K 3.90K 6.00K 4.97K 714.51K 552.06K 313.25K 327.09K 913.22K 730.33K 62.73K 79.48K 42.57K 338.26K 1.37M 1.59M 3.32M 10.46M
Invesco Ltd 863.33K 1.03M 822.03K 813.49K 826.02K 775.36K 927.48K 1.89M 1.30M 1.37M 1.42M 1.72M 2.91M 5.00M 4.53M 2.32M 2.43M 4.15M 6.50M 6.63M
Geode Capital Management 1.85M 1.92M 1.98M 1.97M 1.99M 2.01M 2.11M 2.22M 2.31M 2.43M 2.49M 2.60M 2.62M 2.58M 2.65M 2.69M 2.75M 2.84M 3.12M 2.30M
JPMorgan Chase & Co 746.56K 832.04K 605.86K 532.63K 814.84K 423.21K 3.62M 4.18M 4.79M 5.30M 6.50M 6.59M 4.12M 4.18M 3.65M 3.18M 2.56M 2.07M — 2.10M
Norges Bank Investment Management — — — — — 1.16M — — — 1.24M — 1.29M — 1.79M — 1.97M — 1.70M — 1.53M
Morgan Stanley 569.98K 843.49K 722.22K 1.03M 996.83K 1.03M 983.12K 1.51M 1.05M 970.39K 816.14K 826.23K 1.59M 914.75K 938.03K 1.16M 1.07M 885.09K 1.21M 1.44M
Bank of America Corp 312.93K 372.61K 386.41K 278.35K 265.75K 321.54K 243.39K 203.20K 635.22K 579.51K 983.32K 847.54K 665.72K 415.32K 396.72K 523.89K 1.55M 1.25M 1.36M 1.22M
AQR Capital Management 48.14K 60.11K 43.95K 45.54K 46.52K 42.35K 36.44K 130.99K 69.38K 55.35K 86.85K 572.93K 362.25K 319.73K 239.63K 701.75K 547.60K 711.13K 1.25M 1.21M
Charles Schwab Investment Management 755.38K 774.46K 790.77K 779.59K 804.79K 808.01K 812.33K 836.33K 1.21M 1.18M 1.21M 1.25M 1.24M 1.25M 1.26M 1.29M 1.34M 1.33M 1.33M 1.11M
Goldman Sachs Group 286.85K 896.19K 403.16K 452.14K 581.44K 359.47K 375.51K 300.21K 725.14K 858.44K 1.17M 919.39K 820.86K 1.05M 672.98K 659.61K 1.19M 1.19M 922.11K 960.88K
Northern Trust Corp 1.67M 1.62M 1.57M 1.58M 1.59M 1.58M 1.58M 1.51M 1.52M 1.63M 1.45M 1.30M 1.29M 1.46M 1.42M 1.39M 1.39M 1.32M 1.33M 949.11K
Citadel Advisors 196.20K 196.53K 199.16K 136.40K 148.50K 143.70K 340.70K 668.75K 760.75K 514.75K 399.37K 306.50K 486.75K 403.00K 302.67K 441.80K 386.00K 438.20K 117.59K 877.75K
BNY Mellon 1.01M 1.19M 1.17M 1.12M 1.16M 1.08M 1.03M 1.13M 1.99M 2.17M 2.31M 2.24M 2.16M 2.10M 1.78M 2.02M 1.60M 1.09M 779.88K 828.23K
Manulife Financial 55.77K 54.98K 44.56K 44.23K 43.62K 42.97K 43.63K 44.25K 69.66K 128.11K 131.59K 131.65K 127.16K 128.15K 126.05K 121.21K 115.37K 113.99K 102.40K 797.20K
D. E. Shaw & Co 1.50M 1.43M 1.36M 1.30M 1.27M 1.33M 1.25M 662.49K 250.01K 140.13K 76.53K 53.30K 800.70K 394.35K 56.76K 52.53K 86.10K 18.49K 12.80K 739.70K
Citigroup Inc 90.02K 130.02K 127.28K 79.16K 99.20K 88.59K 73.26K 118.23K 270.41K 204.57K 532.92K 677.57K 112.92K 117.20K 111.95K 150.13K 370.34K 502.54K 1.01M 532.40K
Millennium Management 860.48K 778.03K 565.36K 571.00K 10.07K 475.68K 789.48K 483.59K 202.06K 1.87M 24.25K 37.26K 936.60K 595.05K 236.09K 418.51K 215.43K 290.58K 146.31K 513.72K
Principal Global Investors 751.84K 737.96K 730.78K 760.82K 710.43K 679.73K 663.53K 939.30K 926.40K 876.41K 543.54K 424.38K 325.41K 330.13K 506.71K 516.02K 472.97K 411.72K 373.54K 429.95K
Wellington Management Group 2.39M 2.39M 2.25M 2.39M 2.65M 2.73M 2.47M 1.87M 1.78M 3.93M 4.12M 6.20M 1.46M 1.25M 1.19M 1.21M 750.45K 933.93K 856.60K 418.53K

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