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. 99.5% of the shares are freely tradable; institutional investors hold 99.4%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 12.88 | 13,964,477 | -14.4 | 06/30/2026 |
| FMR Inc | 9.64 | 10,460,026 | +215.2 | 06/30/2026 |
| Amvescap Plc. | 6.12 | 6,632,458 | +2.1 | 06/30/2026 |
| Vanguard Portfolio Management, LLC | 5.60 | 6,068,516 | -8.7 | 06/30/2026 |
| Vanguard Capital Management, LLC | 4.49 | 4,874,385 | +1.0 | 06/30/2026 |
| State Street Corp | 3.61 | 3,915,113 | -10.5 | 06/30/2026 |
| T. Rowe Price Associates, Inc. | 3.07 | 3,334,512 | -1.2 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| iShares Core S&P Mid-Cap ETF | 3.56 | 3,863,446 | +0.0 | 09/30/2026 |
| Vanguard MStar Total Stk Mkt Idx Invest | 3.18 | 3,447,859 | +0.3 | 09/30/2026 |
| Vanguard Small Cap Index | 2.25 | 2,441,685 | -1.9 | 09/30/2026 |
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 | 3,747 | 317,371 $ | Oct 2, 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 |
|---|---|---|---|---|---|---|
| Oct 2, 2026 | Kissner Charles | Director | Sell | 5,000 | 111.00 | 555,000 |
| Sep 22, 2026 | Kissner Charles | Director | Sell | 5,000 | 105.00 | 525,000 |
| 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: October 30, 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.