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Equibles

RMBS

Rambus Inc

Company with tickers: RMBS

CIK
917273
CUSIP
750917106
Shares Outstanding
108,136,967
13F Activity (30d)
294 filings 284 filers

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 553
Total Value: $8,900,174,151
Total Shares: 103,454,313
Showing 1–100 of 566 holdings by value · page 1 of 6

Institutional Ownership Trend

25 quarters

Holder Concentration

Across 553 13F filers · Δ vs Dec 31, 2025
Top Holder
15.8%
Jun 2023 → Mar 2026 · range 14.5% – 18.8%
−0.4 pts
Top 5
37.4%
Jun 2023 → Mar 2026 · range 37.4% – 46.2%
−4.6 pts
Top 10
51.0%
Jun 2023 → Mar 2026 · range 50.9% – 57.9%
−1.3 pts
HHI
443
Jun 2023 → Mar 2026 · range 443 – 628
Broadly held −84

Quarterly Activity

vs Dec 31, 2025
New
84
Increased
187
Decreased
207
Sold Out
85
Unchanged
75
Holder count: -1
Institutional value: -3.9%
Shares held: +2.6%

Top Buyers

vs Dec 31, 2025
Institution Added Now Holds Open
Mega Invesco Ltd. +2,350,395 6,499,048
Mega FMR LLC +1,731,420 3,318,449
Mega T. Rowe Price Investment Management, Inc. +1,703,180 2,391,020
Large BESSEMER GROUP INC +946,177 1,039,905
Large EdgePoint Investment Group Inc. +541,056 1,947,742

Top Sellers

vs Dec 31, 2025
Institution Sold Now Holds Open
Mega PRICE T ROWE ASSOCIATES INC /MD/ −2,008,881 3,376,689
Mega ALLIANCEBERNSTEIN L.P. −1,633,119 267,189
Large Driehaus Capital Management LLC −780,211 173,953
Large Allspring Global Investments Holdings, LLC −455,695 66,531
Large WESTFIELD CAPITAL MANAGEMENT CO LP −347,656 14,436

Top New Positions

vs Dec 31, 2025
Institution Acquired Value (USD) Open
Mega VANGUARD PORTFOLIO MANAGEMENT LLC 6,644,320 $571,610,849
Mega VANGUARD CAPITAL MANAGEMENT LLC 4,827,854 $415,340,279
Mega VANGUARD FIDUCIARY TRUST CO 749,880 $64,512,176
Mid PointState Capital LP 701,307 $60,333,441
Mega Clearbridge Investments, LLC 583,270 $50,178,718

Top Sold-Out Positions

vs Dec 31, 2025
Institution Previously Held Last Value (USD) Open
Mega VANGUARD GROUP INC 12,290,929 $1,129,413,463
Mega NORGES BANK 1,701,551 $156,355,521
Large WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC 316,397 $29,073,720
Large Public Sector Pension Investment Board 305,209 $28,045,655
Large TUDOR INVESTMENT CORP ET AL 110,005 $10,108,359
Filter: New 84 Increased 187 Reduced 207 Sold out 85 Unchanged 75
Showing 100 of 566
All Common Calls Puts
Export CSV
Holder Value (USD) % of 13F Shares Open
Mega BlackRock, Inc. $1,402,745,465 15.76% 16,305,306
Mega VANGUARD PORTFOLIO MANAGEMENT LLC $571,610,849 6.42% 6,644,320
Mega Invesco Ltd. $559,113,092 6.28% 6,499,048
Mega VANGUARD CAPITAL MANAGEMENT LLC $415,340,279 4.67% 4,827,854
Mega STATE STREET CORP $376,262,270 4.23% 4,373,617
Mega PRICE T ROWE ASSOCIATES INC /MD/ $290,496,553 3.26% 3,376,689
Mega FMR LLC $285,486,165 3.21% 3,318,449
Mega GEODE CAPITAL MANAGEMENT, LLC $268,800,304 3.02% 3,124,495
Mega T. Rowe Price Investment Management, Inc. $205,699,450 2.31% 2,391,020
Large EdgePoint Investment Group Inc. $167,564,244 1.88% 1,947,742
Mega JPMORGAN CHASE & CO $157,994,092 1.78% 1,836,500
Mega DIMENSIONAL FUND ADVISORS LP $154,449,227 1.74% 1,795,295
Large Swedbank AB Bank $134,464,890 1.51% 1,563,000
Mega BANK OF AMERICA CORP /DE/ Bank $117,135,866 1.32% 1,361,570
Mega NORTHERN TRUST CORP Bank $114,772,189 1.29% 1,334,095
Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC $114,110,364 1.28% 1,326,402
Mega NEUBERGER BERMAN GROUP LLC $112,025,598 1.26% 1,302,169
Large CONGRESS ASSET MANAGEMENT CO $109,772,387 1.23% 1,275,978
Mega AQR CAPITAL MANAGEMENT LLC $107,576,725 1.21% 1,250,456
Mega MORGAN STANLEY $104,371,332 1.17% 1,213,197
Mega BARCLAYS PLC $94,263,155 1.06% 1,095,701
Large BESSEMER GROUP INC $89,463,020 1.01% 1,039,905
Mega CITIGROUP INC $86,679,353 0.97% 1,007,548
Mega AMERIPRISE FINANCIAL INC $83,897,227 0.94% 975,209
Mega UBS Group AG $82,277,971 0.92% 956,387
Mega GOLDMAN SACHS GROUP INC $79,328,691 0.89% 922,105
Mega Nuveen, LLC $76,767,751 0.86% 892,337
Mega WELLINGTON MANAGEMENT GROUP LLP $73,693,124 0.83% 856,598
Mega RAYMOND JAMES FINANCIAL INC $68,047,921 0.76% 790,979
Mega Bank of New York Mellon Corp Bank $67,092,897 0.75% 779,878
Large VOYA INVESTMENT MANAGEMENT LLC $65,880,482 0.74% 765,785
Mega VANGUARD FIDUCIARY TRUST CO Bank $64,512,176 0.72% 749,880
Large Rafferty Asset Management, LLC $64,136,999 0.72% 745,519
Mega Fisher Asset Management, LLC $63,520,766 0.71% 738,356
Mid Hood River Capital Management LLC $62,586,308 0.70% 727,494
Mid PointState Capital LP $60,333,441 0.68% 701,307
Large LOOMIS SAYLES & CO L P $56,765,604 0.64% 659,835
Mega Clearbridge Investments, LLC $50,178,718 0.56% 583,270
Mid OBERWEIS ASSET MANAGEMENT INC/ $45,278,965 0.51% 526,316
Mid EMERALD ADVISERS, LLC $42,433,093 0.48% 493,236
Large Caisse de depot et placement du Quebec $38,592,627 0.43% 448,595
Large PANAGORA ASSET MANAGEMENT INC $37,546,158 0.42% 436,431
Mid SCHWARTZ INVESTMENT COUNSEL INC $36,161,592 0.41% 420,337
Mid Stephens Investment Management Group LLC $35,081,571 0.39% 407,783
Large LORD, ABBETT & CO. LLC $33,303,847 0.37% 387,119
Mega PRINCIPAL FINANCIAL GROUP INC $32,135,301 0.36% 373,536
Large WESTWOOD HOLDINGS GROUP INC $31,757,974 0.36% 369,150
Mega JANUS HENDERSON GROUP PLC $30,875,478 0.35% 358,892
Mid Champlain Investment Partners, LLC $30,731,894 0.35% 357,223
Large SEI INVESTMENTS CO $29,244,263 0.33% 339,931
Small Shannon River Fund Management LLC $28,718,276 0.32% 333,817
Large NOMURA ASSET MANAGEMENT INTERNATIONAL INC. $28,126,476 0.32% 326,938
Mega FRANKLIN RESOURCES INC $27,818,999 0.31% 323,364
Mega RHUMBLINE ADVISERS $27,493,467 0.31% 319,580
Mid TimesSquare Capital Management, LLC $26,872,330 0.30% 312,360
Mid EMERALD MUTUAL FUND ADVISERS TRUST Mutual Fund $26,432,545 0.30% 307,248
Mega FIRST TRUST ADVISORS LP $26,432,201 0.30% 307,244
Mid Granahan Investment Management, LLC $24,109,563 0.27% 280,246
Mega ALLIANCEBERNSTEIN L.P. $22,986,269 0.26% 267,189
Mega BNP PARIBAS ARBITRAGE, SA $22,746,159 0.26% 264,398
Mid ArrowMark Colorado Holdings LLC $22,515,427 0.25% 261,716
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $21,593,530 0.24% 251,000
Mega UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC $20,699,330 0.23% 240,606
Mega California Public Employees Retirement System Pension $19,552,124 0.22% 227,271
Mid Ranger Investment Management, L.P. $19,302,120 0.22% 224,365
Large FEDERATED HERMES, INC. $18,530,861 0.21% 215,400
Mega Swiss National Bank Bank $18,324,390 0.21% 213,000
Large OSAIC HOLDINGS, INC. $17,182,427 0.19% 199,726
Mega CANADA PENSION PLAN INVESTMENT BOARD Pension $17,158,511 0.19% 199,448
Mega VICTORY CAPITAL MANAGEMENT INC $15,743,403 0.18% 182,999
Large HighTower Advisors, LLC $15,622,703 0.18% 181,596
Large Driehaus Capital Management LLC $14,965,176 0.17% 173,953
Large WCM INVESTMENT MANAGEMENT, LLC $14,196,498 0.16% 165,018
Large Thrivent Financial for Lutherans $13,941,763 0.16% 162,057
Large GLENMEDE TRUST CO NA Bank $13,690,038 0.15% 159,131
Mega Legal & General Group Plc $13,653,304 0.15% 158,704
Mid SEGALL BRYANT & HAMILL, LLC $13,545,423 0.15% 157,450
Large DekaBank Deutsche Girozentrale Bank $13,263,503 0.15% 154,173
Mid STEADFAST CAPITAL MANAGEMENT LP $13,184,097 0.15% 153,250
Large ASSETMARK, INC $12,694,070 0.14% 147,554
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $12,534,571 0.14% 145,700
Mega VAN ECK ASSOCIATES CORP $12,495,943 0.14% 145,251
Mega MILLENNIUM MANAGEMENT LLC $12,157,243 0.14% 141,314
Large MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. Mutual Fund $12,137,541 0.14% 141,085
Mid AXIOM INVESTORS LLC /DE $11,977,870 0.13% 139,229
Large Man Group plc $11,969,525 0.13% 139,132
Large Mirae Asset Global Investments Co., Ltd. $11,551,506 0.13% 134,273
Mid MUTUAL OF AMERICA CAPITAL MANAGEMENT LLC $11,408,524 0.13% 132,611
Large Retirement Systems of Alabama Pension $11,353,551 0.13% 131,972
Large Russell Investments Group, Ltd. $11,174,607 0.13% 129,892
Large Tidal Investments LLC $10,779,988 0.12% 125,305
Mega WELLS FARGO & COMPANY/MN $10,744,199 0.12% 124,889
Large CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Pension $10,684,495 0.12% 124,195
Mega TD Asset Management Inc $10,347,860 0.12% 120,282
Small Tairen Capital Ltd $10,323,600 0.12% 120,000
Large Handelsbanken Fonder AB $10,134,075 0.11% 117,797
Mid INTECH INVESTMENT MANAGEMENT LLC $9,838,993 0.11% 114,367
Large Janney Montgomery Scott LLC $9,515,520 0.11% 110,607
Mega JANE STREET GROUP, LLC $9,463,300 0.11% 110,000
Large MetLife Investment Management, LLC $9,448,932 0.11% 109,833

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