Rambus Inc
Ownership
Ownership Structure
Who owns Rambus Inc (RMBS)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 99.2% of the shares are freely tradable; institutional investors hold 99.4%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 15.03 | 16,305,306 | +0.2 | 03/31/2026 |
| Vanguard Portfolio Management, LLC | 6.13 | 6,644,320 | +0.0 | 03/31/2026 |
| Amvescap Plc. | 5.99 | 6,499,048 | +56.7 | 03/31/2026 |
| Vanguard Capital Management, LLC | 4.45 | 4,827,854 | +0.0 | 03/31/2026 |
| State Street Corp | 4.03 | 4,373,617 | +2.9 | 03/31/2026 |
| T. Rowe Price Associates, Inc. | 3.11 | 3,376,689 | -37.3 | 03/31/2026 |
| FMR Inc | 3.06 | 3,318,449 | +109.1 | 03/31/2026 |
| Geode Capital Management, LLC | 2.88 | 3,124,495 | +9.9 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| iShares Core S&P Mid-Cap ETF | 3.49 | 3,787,045 | +0.0 | 08/31/2026 |
| Vanguard MStar Total Stk Mkt Idx Invest | 3.17 | 3,442,607 | +0.3 | 07/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Kissner Charles | Director | 13,747 | 1,180,867 $ | Aug 7, 2026 | indirect |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Aug 7, 2026 | Kissner Charles | Director | Sell | 5,000 | 100.92 | 504,600 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: September 17, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.