RMBS
Rambus Inc. · Technology · Semiconductors
Momentum inputs (comparable managers):
holder breadth -18.8% ·
share flow +12.2% ·
net new positions -20.0%
· formula
Concentrated accumulation: rising shares among fewer holders
All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q1 2025
| Quarter | Holders | Δ | Shares | Reported value | New | Exits |
|---|---|---|---|---|---|---|
| Q3 2026 | 3 | 0 | 186.25K | $16.07M | n/a | −1 |
| Q2 2026 | 139 | +6 | 78.25M | $10.35B | +12 | −7 |
| Q1 2026 | 137 | -4 | 75.08M | $6.44B | +5 | −10 |
| Q4 2025 | 140 | 0 | 82.50M | $7.59B | +2 | −1 |
| Q3 2025 | 21 | +3 | 52.09M | $5.43B | +3 | −1 |
| Q2 2025 | 16 | 0 | 44.72M | $2.86B | +1 | −1 |
| Q1 2025 | 13 | -3 | 20.22M | $1.05B | n/a | −3 |
| Q4 2024 | 16 | +1 | 18.03M | $953.00M | +1 | n/a |
| Q3 2024 | 14 | +2 | 9.95M | $420.01M | +2 | n/a |
| Q2 2024 | 12 | n/a | 12.20M | $716.28M | n/a | n/a |
| # | Manager | Shares | Δ shares | Value | Their weight | Held | ||
|---|---|---|---|---|---|---|---|---|
| 1 | T. Rowe Price ✦ | 8.75M | +60.5% | $452.87M | 0.1% | ▲ Add | 4 | SEC ↗ ×2 |
| 2 | State Street Global Advisors ✦ (passive) | 4.58M | -3.3% | $237.16M | 0.0% | ▼ Trim | 2 | SEC ↗ |
| 3 | Geode Capital Management ✦ (passive) | 2.65M | +2.9% | $137.34M | 0.0% | ▲ Add | 4 | SEC ↗ ×2 |
| 4 | Norges Bank ✦ (passive) | 2.01M | +12.6% | $104.05M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 5 | Wellington Management ✦ | 1.19M | -4.4% | $61.82M | 0.0% | ▼ Trim | 4 | SEC ↗ ×4 |
| 6 | Two Sigma Investments ✦ | 313.17K | -40.9% | $16.21M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 7 | Millennium Management ✦ | 236.09K | -60.3% | $12.22M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 8 | AQR Capital Management ✦ | 239.63K | -25.1% | $12.22M | 0.0% | ▼ Trim | 4 | SEC ↗ ×5 |
| 9 | Bridgewater Associates ✦ | 78.08K | +992.8% | $4.04M | 0.0% | ▲ Add | 4 | SEC ↗ |
| 10 | PRIMECAP Management ✦ | 72.90K | -11.6% | $3.77M | 0.0% | ▼ Trim | 4 | SEC ↗ |
| 11 | D. E. Shaw & Co. ✦ | 56.76K | -85.6% | $2.94M | 0.0% | ▼ Trim | 4 | SEC ↗ ×2 |
| 12 | Renaissance Technologies ✦ | 22.90K | +502.6% | $1.19M | 0.0% | ▲ Add | 2 | SEC ↗ |
| 13 | Citadel Advisors ✦ | 18.27K | -83.8% | $946,033 | 0.0% | ▼ Trim | 3 | SEC ↗ ×2 |
“Their weight” = the position's share of that manager's reported 13F equity value: the conviction measure. ✦ = curated manager.
New buyers
| No new tracked buyers this quarter. |
Exited
| Point72 Asset Management | $8.52M | was 0.0% |
| Marshall Wace | $1.08M | was 0.0% |
| Gotham Asset Management | $216,303 | was 0.0% |
Full-market context: across ALL 13F filers (SEC structured data, Q1 2026): 549 holders, 100.74M shares, $7.93B reported. This is a different, older period than the tracked-universe figures above and the two are never mixed.
What else this security's tracked holders most often hold: shared-ownership counts, not fundamental relationships.
Open-market purchases (P)
No open-market insider purchases in our coverage window.
Open-market sales (S)
Director · 5.00K sh · $525,000
Director · 5.00K sh · $504,600
Awards, exercises and tax withholding are never counted as buys or sales here. Methodology