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 $8.03B 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 $1.40B in its March 31, 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 $1.48B, representing an estimated gain of +5.81% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 55% of the total disclosed RMBS value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Vanguard Portfolio Management 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
564
Total Reported Value
$8.03B
Largest Holder
Blackrock, Inc.
Largest Position
$1.40B
Insider Transactions (90d)
7
Latest Filing Quarter
Q2 2026
New Institutional Positions
67
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.02% | 16,305,306 | $1,402,745,519 | $1,484,272,005 | +$81,526,486 | +5.81% | |
| Vanguard Portfolio Management Llc | 0.03% | 6,644,320 | $571,610,850 | $604,832,450 | +$33,221,600 | +5.81% | |
| Invesco Ltd. | 0.09% | 6,499,048 | $559,113,102 | $591,608,339 | +$32,495,237 | +5.81% | |
| Vanguard Capital Management Llc | 0.01% | 4,827,854 | $415,340,280 | $439,479,550 | +$24,139,270 | +5.81% | |
| State Street Corp | 0.01% | 4,373,617 | $376,262,271 | $398,130,356 | +$21,868,085 | +5.81% | |
| Fmr Llc | 0.02% | 3,318,449 | $285,486,134 | $302,078,412 | +$16,592,278 | +5.81% | |
| Geode Capital Management, Llc | 0.02% | 3,124,495 | $268,843,262 | $284,422,780 | +$15,579,518 | +5.80% | |
| Swedbank Ab | 0.19% | 1,646,500 | $218,556,410 | $149,880,895 | -$68,675,515 | -31.42% | |
| Edgepoint Investment Group Inc. | 1.34% | 1,947,742 | $167,564,244 | $177,302,954 | +$9,738,710 | +5.81% | |
| Dimensional Fund Advisors Lp | 0.03% | 1,795,295 | $154,417,340 | $163,425,704 | +$9,008,364 | +5.83% | |
| Bank Of America Corp | 0.01% | 1,361,570 | $117,135,866 | $123,943,717 | +$6,807,851 | +5.81% | |
| Northern Trust Corp | 0.02% | 1,334,095 | $114,772,192 | $121,442,668 | +$6,670,476 | +5.81% | |
| Charles Schwab Investment Management Inc | 0.02% | 1,326,402 | $114,110,364 | $120,742,374 | +$6,632,010 | +5.81% | |
| Neuberger Berman Group Llc | 0.09% | 1,302,169 | $111,719,586 | $118,536,444 | +$6,816,858 | +6.10% | |
| Morgan Stanley | 0.01% | 1,213,197 | $104,371,458 | $110,437,323 | +$6,065,865 | +5.81% | |
| Aqr Capital Management Llc | 0.05% | 1,250,456 | $103,962,871 | $113,829,010 | +$9,866,139 | +9.49% | |
| Congress Asset Management Co | 0.64% | 777,993 | $103,270,791 | $70,820,703 | -$32,450,088 | -31.42% | |
| Barclays Plc | 0.03% | 1,095,701 | $94,263,156 | $99,741,662 | +$5,478,506 | +5.81% | |
| Ameriprise Financial Inc | 0.02% | 975,209 | $83,895,612 | $88,773,275 | +$4,877,663 | +5.81% | |
| Ubs Group Ag | 0.01% | 956,387 | $82,277,975 | $87,059,909 | +$4,781,934 | +5.81% | |
| Goldman Sachs Group Inc | 0.01% | 922,105 | $79,328,623 | $83,939,218 | +$4,610,595 | +5.81% | |
| Nuveen, Llc | 0.02% | 892,337 | $76,767,752 | $81,229,437 | +$4,461,685 | +5.81% | |
| Wellington Management Group Llp | 0.01% | 856,598 | $73,693,126 | $77,976,116 | +$4,282,990 | +5.81% | |
| Citigroup Inc | 0.03% | 532,402 | $70,671,041 | $48,464,554 | -$22,206,487 | -31.42% | |
| Bank Of New York Mellon Corp | 0.01% | 779,878 | $67,092,887 | $70,992,294 | +$3,899,407 | +5.81% | |
| Voya Investment Management Llc | 0.07% | 765,785 | $65,880,484 | $69,709,409 | +$3,828,925 | +5.81% | |
| Vanguard Fiduciary Trust Co | 0.02% | 749,880 | $64,512,176 | $68,261,576 | +$3,749,400 | +5.81% | |
| Rafferty Asset Management, Llc | 0.26% | 745,519 | $64,137,000 | $67,864,595 | +$3,727,595 | +5.81% | |
| Fisher Asset Management, Llc | 0.02% | 738,356 | $63,520,780 | $67,212,547 | +$3,691,767 | +5.81% | |
| Hood River Capital Management Llc | 0.63% | 727,494 | $62,586,309 | $66,223,779 | +$3,637,470 | +5.81% | |
| Pointstate Capital Lp | 1.40% | 701,307 | $60,333,441 | $63,839,976 | +$3,506,535 | +5.81% | |
| Loomis Sayles & Co L P | 0.08% | 659,835 | $56,765,605 | $60,064,780 | +$3,299,175 | +5.81% | |
| Stephens Investment Management Group Llc | 0.58% | 409,436 | $54,348,535 | $37,270,959 | -$17,077,576 | -31.42% | |
| Clearbridge Investments, Llc | 0.04% | 583,270 | $50,178,756 | $53,095,068 | +$2,916,312 | +5.81% | |
| Raymond James Financial Inc | 0.02% | 586,443 | $49,163,073 | $53,383,906 | +$4,220,833 | +8.59% | |
| Oberweis Asset Management Inc/ | 1.34% | 526,316 | $45,278,965 | $47,910,545 | +$2,631,580 | +5.81% | |
| Emerald Advisers, Llc | 1.34% | 493,236 | $42,433,093 | $44,899,273 | +$2,466,180 | +5.81% | |
| Caisse De Depot Et Placement Du Quebec | 0.06% | 448,595 | $38,592,628 | $40,835,603 | +$2,242,975 | +5.81% | |
| Panagora Asset Management Inc | 0.14% | 436,431 | $37,546,159 | $39,728,314 | +$2,182,155 | +5.81% | |
| Principal Financial Group Inc | 0.02% | 373,536 | $32,135,301 | $34,002,982 | +$1,867,681 | +5.81% | |
| Westwood Holdings Group Inc | 0.23% | 369,150 | $31,757,974 | $33,603,725 | +$1,845,751 | +5.81% | |
| Janus Henderson Group Plc | 0.02% | 358,892 | $30,874,989 | $32,669,939 | +$1,794,950 | +5.81% | |
| Champlain Investment Partners, Llc | 0.39% | 357,223 | $30,731,895 | $32,518,010 | +$1,786,115 | +5.81% | |
| Sei Investments Co | 0.03% | 339,931 | $29,244,128 | $30,943,919 | +$1,699,791 | +5.81% | |
| Shannon River Fund Management Llc | 5.48% | 333,817 | $28,718,276 | $30,387,362 | +$1,669,086 | +5.81% | |
| Nomura Asset Management International Inc. | 0.05% | 326,938 | $28,126,000 | $29,761,166 | +$1,635,166 | +5.81% | |
| Franklin Resources Inc | 0.01% | 323,364 | $27,819,006 | $29,435,825 | +$1,616,819 | +5.81% | |
| Rhumbline Advisers | 0.02% | 319,580 | $27,493,436 | $29,091,367 | +$1,597,931 | +5.81% | |
| Timessquare Capital Management, Llc | 0.46% | 312,360 | $26,872,331 | $28,434,131 | +$1,561,800 | +5.81% | |
| Emerald Mutual Fund Advisers Trust | 1.28% | 307,248 | $26,432,545 | $27,968,785 | +$1,536,240 | +5.81% |
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.