As of November 6, 2026, Rambus Inc. is a publicly traded company (Nasdaq: RMBS); its largest reported holder is BlackRock, with 10.4% on Schedule 13G/A of October 27, 2026, then Fidelity (FMR) (6.6%). The largest insider holding is Luc Seraphin, the chief executive and president, with 345,767 shares (0.32% of shares outstanding), per Form 4 of April 3, 2026 (Schedule 13G/A, October 27, 2026).
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Is Rambus Inc. a real, registered company?
- Rambus Inc files with the SEC under CIK 917273 (its SEC filings).
- Its shares are listed under the ticker RMBS on Nasdaq (SEC company record).
- Incorporated in Delaware; business address in San Jose, California, as its SEC filings state.
- Court and bankruptcy records: see Before you sign or pay below.
Before you sign or pay
- Court and bankruptcy: No federal court case or bankruptcy filing found under RAMBUS INC in our court records and SEC 8-K records (as of 2026-11-06).
- Leadership changes: the latest reported is John Allen, Principal Accounting Officer (Form 8-K filed 2026-09-04). Check you are dealing with the people now in charge.
- Ownership: 5%+ holders are reported on Schedule 13D or 13G; the latest names Fidelity (FMR) (filed 2026-11-05).
Who are Rambus Inc.'s owners and officers?
Rambus Inc.: incorporated in Delaware; business address in San Jose, California; industry Semiconductors & Related Devices (Schedule 13G/A, 2026-11-05).
| Report | Holder | Share |
|---|---|---|
| Schedule 13G/A, 2026-11-05 | Fmr LLC | 6.6% |
| Schedule 13G/A, 2026-10-27 | Blackrock, Inc. | 10.4% |
| Schedule 13G/A, 2026-07-29 | Blackrock, Inc. | 12.2% |
| Schedule 13G, 2026-06-05 | Fmr LLC | 10.4% |
| Schedule 13G/A, 2026-05-15 | T. Rowe Price Associates, Inc. | 3.1% |
| Schedule 13G, 2026-05-06 | Invesco LTD. | 6% |
| Schedule 13G, 2026-04-30 | Vanguard Capital Management | 5.22% |
| Schedule 13G, 2026-04-29 | Vanguard Portfolio Management | 6.23% |
| Schedule 13G/A, 2026-03-27 | The Vanguard Group | 0% |
| Schedule 13G, 2026-02-17 | T. Rowe Price Associates, Inc. | 5% |
| Schedule 13G/A, 2026-01-21 | Blackrock, Inc. | 14% |
| Schedule 13G/A, 2025-08-14 | T. Rowe Price Associates, Inc. | 4.4% |
Questions about who owns Rambus Inc.
Who owns Rambus Inc.?
On this page, 5 holders' latest ownership filings report 5% or more of Rambus Inc.: Blackrock, Inc. (10.4%, Schedule 13G/A, filed 2026-10-27), Fmr LLC (6.6%, Schedule 13G/A, filed 2026-11-05), Vanguard Portfolio Management (6.23%, Schedule 13G, filed 2026-04-29), Invesco LTD. (6%, Schedule 13G, filed 2026-05-06) and Vanguard Capital Management (5.22%, Schedule 13G, filed 2026-04-30).
Who are the largest shareholders of Rambus Inc.?
By the share each holder's latest filing reports, the largest holders of Rambus Inc. on this page are Blackrock, Inc. (10.4%), Fmr LLC (6.6%) and Vanguard Portfolio Management (6.23%).
When did Blackrock, Inc. buy into Rambus Inc.?
The filings give report dates, not purchase dates. The earliest filing from Blackrock, Inc. on this page is the Schedule 13G/A, filed 2026-01-21, reporting 14%; its latest, Schedule 13G/A filed 2026-10-27, reports 10.4%. That earliest filing is itself an amendment, which updates an earlier report.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 12 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
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| Filed | Person | Role | Change | Effective |
|---|---|---|---|---|
| Form 8-K, 2026-09-04 | John Allen | Principal Accounting Officer | departed | 2026-09-08 |
| Form 8-K, 2026-09-04 | William Taulbee | Chief Accounting Officer | appointed | 2026-09-08 |
| Form 8-K, 2026-04-29 | Sumeet Gagneja | Chief Financial Officer | appointed | 2026-04-29 |
Which insiders own Rambus Inc. shares?
Directors, officers and holders of 10% or more report their shares on Forms 3, 4 and 5. Each line is the latest such report, largest holding first.
- , the chief executive and president: 345,767 shares (0.32% of shares outstanding) (Form 4, 2026-04-03).
- , the chief operating officer and executive vice president: 168,358 shares (0.16% of shares outstanding) (Form 4, 2026-05-26).
- , the chief financial officer and senior vice president: 63,618 shares (0.06% of shares outstanding) (Form 4, 2026-02-24).
- , a director: 49,519 shares (0.05% of shares outstanding) (Form 4, 2026-06-03).
- , a director: 44,292 shares (0.04% of shares outstanding), 40,545 held directly and 3,747 indirectly (Form 4, 2026-10-05).
Shares outstanding: 107,095,985 as of 2026-09-30, from the company's latest SEC cover page.
How much has Rambus Inc. raised?
No fundraising or offering filing from Rambus Inc. is on file with us.
Keep reading
More on Rambus Inc. and the records around it.
Rambus Inc. elsewhere on the record
- Leadership changes Sep 2026
Companies that share a holder
- Invesco Ltd. also filed stake reports on 83 other companies: Alignment Healthcare Inc (Aug 2026), ArcBest Corp (Aug 2026), ARKO Petroleum Corp (Aug 2026)
- T. Rowe Price Associates, Inc. also filed stake reports on 191 other companies: PACIFIC BIOSCIENCES OF CALIF (Nov 2026), APARTMENT INVT & MGMT CO -A (Oct 2026), BETA BIONICS INC (Oct 2026)
- FMR LLC also filed stake reports on 761 other companies: ASPEN NEUROSCIENCE INC (Nov 2026), AVALO THERAPEUTICS INC (Nov 2026), BRAZE INC (Nov 2026)
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