Rambus Ownership | Who Owns Rambus?
Rambus Ownership Summary
Rambus is owned by 94.00% institutional investors, 0.76% insiders, and 5.24% retail investors. Blackrock is the largest institutional shareholder, holding 14.60% of RMBS shares. iShares Core S&P Mid-Cap ETF is the top mutual fund, with 3.56% of its assets in Rambus shares.
RMBS Ownership Benchmark
| Type | Name | % Inst | % Insiders | % Retail |
|---|---|---|---|---|
| Stock | Rambus | 94.00% | 0.76% | 5.24% |
| Sector | Technology Stocks | 78.08% | 15.01% | 6.91% |
| Idea | Semiconductor Stocks List | 74.05% | 7.18% | 18.78% |
Institutional Shareholders
Top Institutional Shareholders by Total Shares
| Holder | Shares | % Holding | Value |
|---|---|---|---|
| Blackrock | 15.79M | 14.60% | $927.60M |
| Blackrock funding, inc. /de | 13.96M | 12.93% | $1.85B |
| Vanguard group | 12.29M | 11.41% | $1.13B |
| Fmr | 10.46M | 9.68% | $1.39B |
| Invesco | 6.63M | 6.14% | $880.39M |
| Vanguard capital management | 4.87M | 4.51% | $647.03M |
| State street | 3.92M | 3.62% | $519.50M |
| Price t rowe associates inc /md/ | 3.33M | 3.09% | $442.62M |
| Geode capital management | 2.30M | 2.13% | $305.06M |
| Jpmorgan chase | 2.10M | 1.95% | $260.99M |
Top Institutional Shareholders by % of Total Assets
| Holder | Shares | % Assets | Value |
|---|---|---|---|
| Shannon river fund management | 291.71K | 3.46% | $38.72M |
| Daventry group, lp | 30.50K | 3.06% | $4.05M |
| Aspetuck financial management | 38.17K | 2.98% | $5.07M |
| Deepwater asset management | 44.63K | 2.69% | $5.92M |
| Aubrey capital management | 24.30K | 2.02% | $3.22M |
| Amj financial wealth management | 76.33K | 1.55% | $6.57M |
| Ranger investment management | 176.69K | 1.48% | $23.45M |
| Oberweis asset management inc/ | 527.02K | 1.45% | $69.96M |
| Pointstate capital lp | 764.17K | 1.30% | $101.44M |
| Mesirow institutional investment management | 298.17K | 1.21% | $15.76M |
Top Buyers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Fmr | 10.46M | 0.06% | 7.14M |
| Norges bank | 1.53M | 0.02% | 1.53M |
| Sixth street partners management company | 1.11M | 0.02% | 1.11M |
| D. e. shaw | 739.70K | 0.05% | 726.90K |
| Manufacturers life insurance company, the | 797.20K | 0.08% | 694.79K |
Top Sellers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| T. rowe price investment management | - | - | -2.39M |
| Blackrock funding, inc. /de | 13.96M | 0.03% | -2.34M |
| Edgepoint investment group | 1.09M | 1.09% | -861.53K |
| Geode capital management | 2.30M | 0.02% | -826.84K |
| Hood river capital management | - | - | -727.49K |
New Positions
| Holder | Shares | % Assets | Change | Value |
|---|---|---|---|---|
| Norges bank | 1.53M | 0.02% | 1.53M | $203.44M |
| Sixth street partners management company | 1.11M | 0.02% | 1.11M | $147.23M |
| Hrt financial lp | 423.35K | 0.10% | 423.35K | $56.20M |
| Maple rock capital partners | 342.60K | 0.89% | 342.60K | $45.48M |
| Gilder gagnon howe | 257.43K | 0.35% | 257.43K | $34.17M |
Sold Out
| Holder | Change |
|---|---|
| Td private client wealth | -1.00 |
| Toronto dominion bank | -1.00 |
| Advisornet financial | -1.00 |
| Activest wealth management | -1.00 |
| Quaker wealth management | -1.00 |
Institutional Ownership Trends
| Date | Holdings | Change % | Shares | Change % | Ownership | Change % | Increased Position | Change % | Decreased Position | Change % |
|---|---|---|---|---|---|---|---|---|---|---|
| Jun 30, 2026 | 640 | 12.28% | 101,548,085 | -1.19% | 93 | 1.03% | 323 | 18.75% | 229 | 9.57% |
| Mar 31, 2026 | 431 | -24.39% | 66,161,078 | -33.73% | 61 | 0.72% | 199 | -31.14% | 159 | -19.70% |
| Dec 31, 2025 | 438 | -19.04% | 72,833,268 | -26.27% | 67 | 0.80% | 210 | -30.00% | 161 | - |
| Sep 30, 2025 | 521 | 12.53% | 98,420,241 | 4.68% | 91 | 1.20% | 289 | 6.64% | 155 | 19.23% |
| Jun 30, 2025 | 464 | 9.43% | 96,964,608 | 0.64% | 90 | 1.12% | 273 | 17.17% | 129 | -0.77% |
Top Mutual Funds Shareholders
| Holder | Shares | % Holding | Change |
|---|---|---|---|
| iShares Core S&P Mid-Cap ETF | 3.86M | 3.56% | -1.38K |
| Vanguard US Total Market Shares ETF | 3.41M | 3.19% | 2.52K |
| Vanguard MStar Total Stk Mkt Idx Invest | 3.45M | 3.18% | 9.16K |
| Vanguard Total Stock Mkt Idx Inv | 3.43M | 3.17% | 1.73K |
| Vanguard Morn Total Stk Mkt Idx Investor | 3.43M | 3.16% | 1.73K |
| iShares Semiconductor ETF | 2.71M | 2.50% | -13.83K |
| iShares Russell 2000 ETF | 2.58M | 2.39% | 23.87K |
| Vanguard Small Cap Index | 2.44M | 2.25% | -46.74K |
| Strategic Advisers Fidelity US TtlStk | 2.08M | 1.92% | 60.30K |
| Invesco Small Cap Value A | 2.00M | 1.84% | -1.05M |
Recent Insider Transactions
| Date | Name | Role | Activity | Value |
|---|---|---|---|---|
| Oct 02, 2026 | KISSNER CHARLES | - | Sell | $555.00K |
| Sep 22, 2026 | KISSNER CHARLES | - | Sell | $525.00K |
| Aug 07, 2026 | KISSNER CHARLES | - | Sell | $504.60K |
| Jun 03, 2026 | Sayiner Necip | - | Sell | $850.75K |
| Jun 02, 2026 | Higashi Emiko | - | Sell | $815.00K |
Insider Transactions Trends
| Date | Buy | Sell |
|---|---|---|
| 2026 Q3 | - | 2 |
| 2026 Q2 | - | 15 |
| 2026 Q1 | - | 12 |
| 2025 Q4 | - | 5 |
| 2025 Q3 | - | 8 |
RMBS Ownership FAQ
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