RMBS Institutional Ownership & Shareholders
RAMBUS INC (RMBS) is currently held by 594 institutional investors tracked by InsiderSet, with a combined reported market value of approximately $12.91B based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of RMBS tracked by InsiderSet, reporting ownership valued at approximately $1.85B in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $1.18B, representing an estimated loss of -36.23% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 57% of the total disclosed RMBS value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Fmr Llc, Invesco Ltd., and several other long-term asset managers with concentrated positions in RAMBUS INC (RMBS).
This page ranks the largest institutional RMBS shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
594
Total Reported Value
$12.91B
Largest Holder
Blackrock, Inc.
Largest Position
$1.85B
Insider Transactions (90d)
3
Latest Filing Quarter
Q2 2026
New Institutional Positions
60
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.03% | 13,964,477 | $1,853,644,563 | $1,182,092,978 | -$671,551,585 | -36.23% | |
| Fmr Llc | 0.06% | 10,460,026 | $1,388,463,915 | $885,441,201 | -$503,022,714 | -36.23% | |
| Invesco Ltd. | 0.07% | 6,632,458 | $880,392,476 | $561,437,570 | -$318,954,906 | -36.23% | |
| Vanguard Portfolio Management Llc | 0.04% | 6,068,516 | $805,534,814 | $513,699,879 | -$291,834,935 | -36.23% | |
| Vanguard Capital Management Llc | 0.01% | 4,874,385 | $647,025,865 | $412,616,690 | -$234,409,175 | -36.23% | |
| State Street Corp | 0.02% | 3,915,113 | $519,498,009 | $331,414,315 | -$188,083,694 | -36.20% | |
| Price T Rowe Associates Inc | 0.04% | 3,334,512 | $442,624,000 | $282,266,441 | -$160,357,559 | -36.23% | |
| Geode Capital Management, Llc | 0.02% | 2,297,660 | $305,059,152 | $194,496,919 | -$110,562,233 | -36.24% | |
| Jpmorgan Chase & Co | 0.02% | 2,101,418 | $260,985,471 | $177,885,034 | -$83,100,437 | -31.84% | |
| Dimensional Fund Advisors Lp | 0.04% | 1,719,400 | $228,190,556 | $145,547,210 | -$82,643,346 | -36.22% | |
| Norges Bank | 0.02% | 1,532,622 | $203,440,244 | $129,736,452 | -$73,703,792 | -36.23% | |
| Morgan Stanley | 0.01% | 1,444,281 | $191,714,297 | $122,258,387 | -$69,455,910 | -36.23% | |
| Swedbank Ab | 0.16% | 1,725,500 | $184,214,380 | $146,063,575 | -$38,150,805 | -20.71% | |
| Bank Of America Corp | 0.01% | 1,218,726 | $161,773,689 | $103,165,156 | -$58,608,533 | -36.23% | |
| Aqr Capital Management Llc | 0.05% | 1,211,009 | $152,478,080 | $102,511,912 | -$49,966,168 | -32.77% | |
| Charles Schwab Investment Management Inc | 0.02% | 1,109,132 | $147,226,181 | $93,888,024 | -$53,338,157 | -36.23% | |
| Edgepoint Investment Group Inc. | 1.09% | 1,086,213 | $144,183,914 | $91,947,930 | -$52,235,984 | -36.23% | |
| Rafferty Asset Management, Llc | 0.30% | 984,388 | $130,667,663 | $83,328,444 | -$47,339,219 | -36.23% | |
| Goldman Sachs Group Inc | 0.01% | 960,878 | $127,546,942 | $81,338,323 | -$46,208,619 | -36.23% | |
| Bessemer Group Inc | 0.18% | 958,929 | $127,290,000 | $81,173,340 | -$46,116,660 | -36.23% | |
| Northern Trust Corp | 0.01% | 949,113 | $125,985,260 | $80,342,415 | -$45,642,845 | -36.23% | |
| Neuberger Berman Group Llc | 0.09% | 1,305,951 | $120,147,476 | $110,548,752 | -$9,598,724 | -7.99% | |
| Bank Of New York Mellon Corp | 0.02% | 828,233 | $109,939,644 | $70,109,923 | -$39,829,721 | -36.23% | |
| Manufacturers Life Insurance Company, The | 0.08% | 797,195 | $105,819,664 | $67,482,557 | -$38,337,107 | -36.23% | |
| Pointstate Capital Lp | 1.79% | 764,172 | $101,436,191 | $64,687,160 | -$36,749,031 | -36.23% | |
| D. E. Shaw & Co., Inc. | 0.06% | 739,701 | $98,187,911 | $62,615,690 | -$35,572,221 | -36.23% | |
| Fisher Asset Management, Llc | 0.03% | 705,847 | $93,694,133 | $59,749,949 | -$33,944,184 | -36.23% | |
| Vanguard Fiduciary Trust Co | 0.02% | 699,213 | $92,813,534 | $59,188,380 | -$33,625,154 | -36.23% | |
| Barclays Plc | 0.03% | 645,970 | $85,746,057 | $54,681,361 | -$31,064,697 | -36.23% | |
| Clearbridge Investments, Llc | 0.06% | 589,641 | $78,268,976 | $49,913,111 | -$28,355,865 | -36.23% | |
| Susquehanna International Group, Llp | 0.07% | 555,935 | $73,794,812 | $47,059,898 | -$26,734,914 | -36.23% | |
| Citigroup Inc | 0.03% | 532,402 | $70,671,041 | $45,067,829 | -$25,603,212 | -36.23% | |
| Oberweis Asset Management Inc/ | 1.45% | 527,016 | $69,956,104 | $44,611,904 | -$25,344,200 | -36.23% | |
| Nuveen, Llc | 0.02% | 496,422 | $65,895,056 | $42,022,122 | -$23,872,934 | -36.23% | |
| Raymond James Financial Inc | 0.02% | 473,778 | $62,889,225 | $40,105,308 | -$22,783,917 | -36.23% | |
| Millennium Management Llc | 0.04% | 472,818 | $62,761,861 | $40,024,044 | -$22,737,817 | -36.23% | |
| Loomis Sayles & Co L P | 0.08% | 470,934 | $62,511,780 | $39,864,563 | -$22,647,217 | -36.23% | |
| Principal Financial Group Inc | 0.03% | 429,951 | $57,071,697 | $36,395,352 | -$20,676,345 | -36.23% | |
| Hrt Financial Lp | 0.10% | 423,352 | $56,195,000 | $35,836,747 | -$20,358,253 | -36.23% | |
| Wellington Management Group Llp | 0.01% | 418,533 | $55,556,070 | $35,428,818 | -$20,127,252 | -36.23% | |
| Stephens Investment Management Group Llc | 0.58% | 409,436 | $54,348,535 | $34,658,757 | -$19,689,778 | -36.23% | |
| Citadel Advisors Llc | 0.03% | 400,151 | $53,116,043 | $33,872,782 | -$19,243,261 | -36.23% | |
| Westfield Capital Management Co Lp | 0.17% | 385,811 | $51,212,552 | $32,658,901 | -$18,553,651 | -36.23% | |
| Ubs Group Ag | 0.01% | 373,590 | $49,590,336 | $31,624,394 | -$17,965,942 | -36.23% | |
| Maple Rock Capital Partners Inc. | 0.89% | 342,600 | $45,476,724 | $29,001,090 | -$16,475,634 | -36.23% | |
| Canada Pension Plan Investment Board | 0.02% | 330,648 | $43,890,216 | $27,989,353 | -$15,900,863 | -36.23% | |
| Ameriprise Financial Inc | 0.01% | 321,195 | $42,638,791 | $27,189,157 | -$15,449,634 | -36.23% | |
| Champlain Investment Partners, Llc | 1.02% | 299,368 | $39,738,108 | $25,341,501 | -$14,396,607 | -36.23% | |
| Rhumbline Advisers | 0.03% | 296,916 | $39,412,567 | $25,133,939 | -$14,278,628 | -36.23% | |
| Shannon River Fund Management Llc | 3.46% | 291,713 | $38,721,984 | $24,693,505 | -$14,028,479 | -36.23% |
Frequently asked questions about RMBS
Who are the largest institutional holders of RMBS?
The largest institutional holders of RMBS reported in the latest SEC Form 13F filings include Blackrock, Inc., Fmr Llc, Invesco Ltd., Vanguard Portfolio Management Llc, and Vanguard Capital Management Llc. InsiderSet ranks institutional holders by their latest reported RMBS position.
What is RMBS institutional ownership?
This page tracks RMBS positions reported by institutional investment managers through SEC Form 13F. RAMBUS INC (RMBS) institutional ownership on InsiderSet reflects disclosed 13F holdings among the managers we analyze, not every shareholder of the stock.
How many institutions own RMBS?
InsiderSet currently tracks 594 institutional managers reporting RMBS holdings in the latest available 13F data. This count reflects institutions included in the SEC Form 13F filings analyzed by InsiderSet and should not be interpreted as the total number of RMBS shareholders.
How much RMBS stock do institutions own?
Institutional investment managers disclosed approximately $12.91B in RMBS holdings for Q2 2026. This figure is reported 13F value as of the filing period, not necessarily today's market value.
When was RMBS institutional ownership last updated?
The latest RMBS institutional ownership data on InsiderSet is based on SEC Form 13F filings for the quarter ended June 30, 2026. Form 13F filings are generally reported after the quarter ends, so the holdings shown represent the latest publicly disclosed positions rather than real-time institutional holdings.
Are institutional RMBS holdings real-time?
No. Form 13F data is not real-time. It represents positions reported by institutional investment managers as of the end of the reporting quarter. An institution may have changed its RMBS position after the reporting date.
Are institutions buying or selling RMBS?
Institutional buying and selling can be analyzed by comparing RMBS positions across consecutive 13F reporting periods. InsiderSet's RMBS Ownership Changes page shows institutions that increased, reduced, initiated, or exited positions based on reported 13F holdings. View RMBS ownership changes.
How has RMBS institutional ownership changed over time?
InsiderSet tracks RMBS institutional holdings across multiple 13F reporting periods, allowing investors to compare institutional holder counts, reported value, and reported shares over time.