RAMBUS INC (RMBS) Institutional Shareholders
RAMBUS INC (RMBS) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026. The institutional investors covered on this page collectively reported approximately $13.14B in RMBS holdings during the latest filing period.
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 $1.14B, representing an estimated loss of -38.67% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 56% 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
604
Total Reported Value
$13.14B
Largest Holder
Blackrock, Inc.
Largest Position
$1.85B
Insider Transactions (90d)
1
Latest Filing Quarter
Q2 2026
New Institutional Positions
85
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 | $1,136,848,073 | -$716,796,490 | -38.67% | |
| Fmr Llc | 0.06% | 10,460,026 | $1,388,463,915 | $851,550,717 | -$536,913,198 | -38.67% | |
| Invesco Ltd. | 0.07% | 6,632,458 | $880,392,476 | $539,948,406 | -$340,444,070 | -38.67% | |
| Vanguard Portfolio Management Llc | 0.04% | 6,068,516 | $805,534,814 | $494,037,888 | -$311,496,926 | -38.67% | |
| Vanguard Capital Management Llc | 0.01% | 4,874,385 | $647,025,865 | $396,823,683 | -$250,202,182 | -38.67% | |
| State Street Corp | 0.02% | 3,915,113 | $519,498,009 | $318,729,349 | -$200,768,660 | -38.65% | |
| Price T Rowe Associates Inc | 0.04% | 3,334,512 | $442,624,000 | $271,462,622 | -$171,161,378 | -38.67% | |
| Geode Capital Management, Llc | 0.02% | 2,297,660 | $305,059,152 | $187,052,501 | -$118,006,651 | -38.68% | |
| Jpmorgan Chase & Co | 0.02% | 2,101,418 | $260,985,471 | $171,076,439 | -$89,909,032 | -34.45% | |
| Dimensional Fund Advisors Lp | 0.04% | 1,719,400 | $228,190,556 | $139,976,354 | -$88,214,202 | -38.66% | |
| Swedbank Ab | 0.19% | 1,646,500 | $218,556,410 | $134,041,565 | -$84,514,845 | -38.67% | |
| Norges Bank | 0.02% | 1,532,622 | $203,440,244 | $124,770,757 | -$78,669,487 | -38.67% | |
| Morgan Stanley | 0.01% | 1,444,281 | $191,714,297 | $117,578,916 | -$74,135,381 | -38.67% | |
| Neuberger Berman Group Llc | 0.12% | 1,311,777 | $173,445,614 | $106,791,766 | -$66,653,848 | -38.43% | |
| Bank Of America Corp | 0.01% | 1,218,726 | $161,773,689 | $99,216,484 | -$62,557,205 | -38.67% | |
| Aqr Capital Management Llc | 0.05% | 1,211,009 | $152,478,080 | $98,588,243 | -$53,889,837 | -35.34% | |
| Charles Schwab Investment Management Inc | 0.02% | 1,109,132 | $147,226,181 | $90,294,436 | -$56,931,745 | -38.67% | |
| Edgepoint Investment Group Inc. | 1.09% | 1,086,213 | $144,183,914 | $88,428,600 | -$55,755,314 | -38.67% | |
| Rafferty Asset Management, Llc | 0.30% | 984,388 | $130,667,663 | $80,139,027 | -$50,528,636 | -38.67% | |
| Goldman Sachs Group Inc | 0.01% | 960,878 | $127,546,942 | $78,225,078 | -$49,321,864 | -38.67% | |
| Bessemer Group Inc | 0.18% | 958,929 | $127,290,000 | $78,066,410 | -$49,223,590 | -38.67% | |
| Northern Trust Corp | 0.01% | 949,113 | $125,985,260 | $77,267,289 | -$48,717,971 | -38.67% | |
| Bank Of New York Mellon Corp | 0.02% | 828,233 | $109,939,644 | $67,426,449 | -$42,513,195 | -38.67% | |
| Manufacturers Life Insurance Company, The | 0.08% | 797,195 | $105,819,664 | $64,899,645 | -$40,920,019 | -38.67% | |
| Congress Asset Management Co | 0.64% | 777,993 | $103,270,791 | $63,336,410 | -$39,934,381 | -38.67% | |
| Pointstate Capital Lp | 1.79% | 764,172 | $101,436,191 | $62,211,243 | -$39,224,948 | -38.67% | |
| D. E. Shaw & Co., Inc. | 0.06% | 739,701 | $98,187,911 | $60,219,058 | -$37,968,853 | -38.67% | |
| Fisher Asset Management, Llc | 0.03% | 705,847 | $93,694,133 | $57,463,004 | -$36,231,129 | -38.67% | |
| Vanguard Fiduciary Trust Co | 0.02% | 699,213 | $92,813,534 | $56,922,930 | -$35,890,604 | -38.67% | |
| Barclays Plc | 0.03% | 645,970 | $85,746,057 | $52,588,418 | -$33,157,639 | -38.67% | |
| Clearbridge Investments, Llc | 0.06% | 589,641 | $78,268,976 | $48,002,674 | -$30,266,302 | -38.67% | |
| Susquehanna International Group, Llp | 0.07% | 555,935 | $73,794,812 | $45,258,668 | -$28,536,144 | -38.67% | |
| Citigroup Inc | 0.03% | 532,402 | $70,671,041 | $43,342,847 | -$27,328,194 | -38.67% | |
| Oberweis Asset Management Inc/ | 1.45% | 527,016 | $69,956,104 | $42,904,373 | -$27,051,731 | -38.67% | |
| Nuveen, Llc | 0.02% | 496,422 | $65,895,056 | $40,413,715 | -$25,481,341 | -38.67% | |
| Raymond James Financial Inc | 0.02% | 473,778 | $62,889,225 | $38,570,267 | -$24,318,958 | -38.67% | |
| Millennium Management Llc | 0.04% | 472,818 | $62,761,861 | $38,492,113 | -$24,269,748 | -38.67% | |
| Loomis Sayles & Co L P | 0.08% | 470,934 | $62,511,780 | $38,338,737 | -$24,173,043 | -38.67% | |
| Principal Financial Group Inc | 0.03% | 429,951 | $57,071,697 | $35,002,311 | -$22,069,386 | -38.67% | |
| Hrt Financial Lp | 0.10% | 423,352 | $56,195,000 | $34,465,086 | -$21,729,914 | -38.67% | |
| Wellington Management Group Llp | 0.01% | 418,533 | $55,556,070 | $34,072,772 | -$21,483,298 | -38.67% | |
| Stephens Investment Management Group Llc | 0.58% | 409,436 | $54,348,535 | $33,332,185 | -$21,016,350 | -38.67% | |
| Citadel Advisors Llc | 0.03% | 400,151 | $53,116,043 | $32,576,293 | -$20,539,750 | -38.67% | |
| Westfield Capital Management Co Lp | 0.17% | 385,811 | $51,212,552 | $31,408,874 | -$19,803,678 | -38.67% | |
| Ubs Group Ag | 0.01% | 373,590 | $49,590,336 | $30,413,962 | -$19,176,374 | -38.67% | |
| Maple Rock Capital Partners Inc. | 0.89% | 342,600 | $45,476,724 | $27,891,066 | -$17,585,658 | -38.67% | |
| Canada Pension Plan Investment Board | 0.02% | 330,648 | $43,890,216 | $26,918,054 | -$16,972,162 | -38.67% | |
| Ameriprise Financial Inc | 0.01% | 321,195 | $42,638,791 | $26,148,485 | -$16,490,306 | -38.67% | |
| Champlain Investment Partners, Llc | 1.02% | 299,368 | $39,738,108 | $24,371,549 | -$15,366,559 | -38.67% | |
| Rhumbline Advisers | 0.03% | 296,916 | $39,412,567 | $24,171,932 | -$15,240,635 | -38.67% |
Frequently asked questions about RMBS
Who owns the most RMBS stock?
The largest holders of RMBS are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for RAMBUS INC (RMBS).
Is RMBS widely held by superinvestors?
Many widely followed stocks like RMBS appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly RMBS is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.