Rambus
Builds memory-interface chipsets and licenses interface and security IP for data-intensive computing.
$86.08
After-hours close+0.36 (+0.42%)
At close$85.72(−5.92%)
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Breakdown13F · Form 4
Institutions 109.02%Insiders 0.74%
A 13F quarter can total more than the shares outstanding — sub-advisers file the same block twice, and a filer's own share count can be a quarter stale. No split is drawn from it.
Shares outstanding 108.46M · Float 107.61M · 99.2% free float
Institutions13F, as of Jun 30, 2026
647 holders · 118.24M shares · 142 new positions · 327 increased · 231 reduced · 77 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| BlackRock, Inc. | 13.96M | 12.88% | −2.34M | Aug 7, 2026 |
| FMR LLC | 10.46M | 9.64% | +7.14M | Aug 13, 2026 |
| Invesco Ltd. | 6.63M | 6.12% | +133.4K | Aug 14, 2026 |
| Vanguard Portfolio Management LLC | 6.07M | 5.60% | −575.8K | Aug 13, 2026 |
| Vanguard Capital Management LLC | 4.87M | 4.49% | +46.5K | Aug 13, 2026 |
| State Street Corp | 3.92M | 3.61% | −458.5K | Aug 7, 2026 |
| Price T Rowe Associates Inc /MD/ | 3.33M | 3.07% | −42.2K | Aug 14, 2026 |
| Geode Capital Management, LLC | 2.30M | 2.12% | −826.8K | Aug 12, 2026 |
Beneficial owners13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| BlackRock, Inc. | 14.00% | 15.06M | 13G | Jan 21, 2026 ↗ |
| FMR LLC | 10.40% | 11.30M | 13G | Jun 5, 2026 ↗ |
| Vanguard Portfolio Management | 6.23% | 6.74M | 13G | Apr 29, 2026 ↗ |
| Invesco Ltd. | 6.00% | 6.50M | 13G | May 6, 2026 ↗ |
| Vanguard Capital Management | 5.22% | 5.65M | 13G | Apr 30, 2026 ↗ |
InsidersForm 4
| Insider | Role | Shares | % outstanding | Filed |
|---|---|---|---|---|
| Luc Seraphin | director, officer: President and CEO | 345.8K | 0.32% | Apr 3, 2026 |
| Xianzhi Sean Fan | officer: EVP, COO | 168.4K | 0.16% | May 26, 2026 |
| Desmond Lynch | officer: SVP, CFO | 63.6K | 0.06% | Feb 24, 2026 |
| Charles Kissner | director | 54.3K | 0.05% | Aug 10, 2026 |
| Emiko Higashi | director | 49.5K | 0.05% | Jun 3, 2026 |
| Eric B. Stang | director | 21.4K | 0.02% | Jun 2, 2026 |
| John Shinn | officer: SVP, General Counsel | 21.1K | 0.02% | May 26, 2026 |
| Meera Rao | director | 20.0K | 0.02% | Apr 27, 2026 |
| Necip Sayiner | director | 18.2K | 0.02% | Jun 3, 2026 |
| John K. Allen | officer: Chief Accounting Officer | 17.1K | 0.02% | Apr 7, 2026 |
1 ten-percent owner holds 69.7K shares by Form 4, outside the officers-and-directors figure above · 31 people have not refiled in the last 18 months (9.88M shares), so they are not in the figure above
Latest trades
| Date | Insider | Type | Shares | Avg price | Owned after |
|---|---|---|---|---|---|
| Aug 7, 2026 | Charles Kissnerdirector | Sale | 5,000 | $100.92 | 13,747 |
| Jun 2, 2026 | Emiko Higashidirector | Sale · 2 lots | 10,000 | $160.50 | 49,519 |
| Jun 3, 2026 | Necip Sayinerdirector | Sale | 5,000 | $170.15 | 18,223 |
| Jun 1, 2026 | Eric B. Stangdirector | Sale | 5,000 | $146.00 | 19,218 |
| May 26, 2026 | Emiko Higashidirector | Sale | 5,000 | $157.57 | 59,519 |
| May 22, 2026 | John Shinnofficer: SVP, General Counsel | Sale | 1,000 | $143.63 | 21,112 |
| May 26, 2026 | Xianzhi Sean Fanofficer: EVP, COO | Sale · 2 lots | 37,914 | $151.69 | 168,358 |
| May 7, 2026 | Steven Laubdirector | Sale | 1,500 | $125.52 | 7,519 |
| May 8, 2026 | Necip Sayinerdirector | Sale | 9,824 | $130.18 | 23,223 |
| Apr 24, 2026 | Meera Raodirector | Sale | 2,972 | $150.30 | 19,974 |
CongressHouse and Senate disclosures
Not reported.