Rambus Inc. (RMBS) Shareholders & Insider Trades
Rambus shareholders at a glance
The largest holder of Rambus stock is BlackRock Advisors LLC, with 13.3 million shares (12.28% of the company), worth about $1.16 billion as of September 25, 2026. The 10 largest holders together own 50.4%.
In Q2 2026, 654 institutional holdings reports listed shares worth $13.40 billion.
Insiders reported 42 transactions in the last two years: 27 sales worth $12.57 million and no purchases. The newest one on file is from October 6, 2025 (Lynch Desmond M, Chief Financial Officer).
Major holders as of September 25, 2026; quarterly totals from institutional holdings reports (latest Q2 2026); insider transactions on file through October 6, 2025.
Rambus Inc.
Shareholders Summary
2026Q2
Ownership by Type
Geographic Distribution
Largest Rambus shareholders
| Holder | Shares | % of company | Value |
|---|---|---|---|
| BlackRock Advisors LLC | 13.3 million | 12.28% | $1.2B |
| Fidelity Management & Research Co. LLC | 10.5 million | 9.64% | $907.0M |
| Invesco Advisers, Inc. | 6.6 million | 6.12% | $575.0M |
| Vanguard Portfolio Management LLC | 6.1 million | 5.59% | $526.0M |
| Vanguard Capital Management LLC | 4.9 million | 4.49% | $423.0M |
| State Street Corporation | 3.9 million | 3.61% | $339.0M |
| T. Rowe Price International Ltd. | 3.3 million | 3.07% | $289.0M |
| Geode Capital Management LLC | 2.3 million | 2.12% | $199.0M |
| JPMorgan Investment Management, Inc. | 2.1 million | 1.94% | $182.0M |
| DFA Australia Ltd. | 1.6 million | 1.52% | $143.0M |
As of September 25, 2026.
Rambus institutional holdings by quarter
| Quarter | Reports | Shares | Value |
|---|---|---|---|
| Q2 2026 | 654 | – | $13.4B |
| Q1 2026 | 574 | 103.0 million | $8.8B |
| Q4 2025 | 583 | 99.9 million | $9.2B |
| Q3 2025 | 550 | 101.0 million | $10.6B |
| Q2 2025 | 485 | 97.5 million | $6.2B |
| Q1 2025 | 439 | 99.5 million | $5.2B |
| Q4 2024 | 423 | 95.1 million | $5.0B |
| Q3 2024 | 406 | 97.4 million | $4.1B |
Shares and value held by institutions that file quarterly holdings reports (options not included).
Rambus insider trades
| Insider | Date | Title | Transaction | Value |
|---|---|---|---|---|
| Lynch Desmond M | Oct 6, 2025 | Chief Financial Officer | Sale at price 101.17 - 101.99 per share. | $920,973 |
| Rao Meera P. | Oct 1, 2025 | Director | Sale at price 101.99 per share. | $66,599 |
| Lynch Desmond M | Sep 15, 2025 | Chief Financial Officer | Sale at price 91.70 per share. | $832,099 |
| Sayiner Necip | Sep 11, 2025 | Director | Sale at price 85.63 per share. | $642,226 |
| Rao Meera P. | Sep 2, 2025 | Director | Sale at price 71.72 per share. | $215,160 |
| Laub Steven A | Aug 29, 2025 | Director | Sale at price 78.72 per share. | $177,995 |
| Quanfeng Dong | Aug 13, 2025 | Director | Sale at price 77.75 per share. | $83,581 |
| Sayiner Necip | Aug 8, 2025 | Director | Sale at price 73.53 per share. | $551,448 |
| Shinn John | Aug 4, 2025 | General Counsel | Sale at price 74.61 per share. | $58,945 |
| Quanfeng Dong | Aug 4, 2025 | Director | Sale at price 75.00 per share. | $83,325 |
| Laub Steven A | May 27, 2025 | Director | Sale at price 55.12 per share. | $101,816 |
| Laub Steven A | May 19, 2025 | Director | Sale at price 55.56 per share. | $202,961 |
Newest 12 of 42 insider transactions in the last two years.
Questions and answers
Who owns the most Rambus stock?
BlackRock Advisors LLC, with 12.28% of the company (as of September 25, 2026). Next: Fidelity Management & Research Co. LLC (9.64%) and Invesco Advisers, Inc. (6.12%).
How many institutions own Rambus stock?
654 institutional holdings reports listed Rambus shares in Q2 2026 worth $13.40 billion.
Are Rambus insiders buying or selling the stock?
In the last two years insiders reported 27 sales and no purchases (42 transactions in all); the newest on file is from October 6, 2025.
