RMBS — RAMBUS INC DEL
Public company
InvestorLens aggregates public filing data to show which tracked investors reported holdings in this stock. Dollar values represent reported position values, not market capitalization, and may be delayed up to 45 days. Not a recommendation.
Sourced from SEC EDGAR public filings
Why are billionaires buying RMBS?
Built from public SEC filings and public economic data. Not a recommendation.
Why? — Evidence & Confidence ▾
Of 2 tracked investors who changed their RMBS position last quarter, 1 bought and 1 sold (50% buy-side). Macro conditions are mixed for this sector (Macro Tailwind 56/100 in a Overheat regime).
- +1 tracked investor added or increased positions last quarter (Stanley Druckenmiller)
- +5 tracked investors reported holding RMBS at their latest filing
- +Macro Health is 56/100 in a Overheat regime — historically acceptable for this sectorsource
- −1 tracked investor reduced or exited last quarter (1 reduced, 0 sold out)
- −13F data is disclosed up to 45 days after quarter end — positions may have changed since
- · 13F disclosure lag (up to 45 days)
- · Tracked investors are a sample, not the whole market
- · Sector regime fit is a historical average, not a guarantee
Every InvestorLens score shows its evidence — including what argues against it. Model conviction-v1 · generated 9/18/2026.
About RAMBUS INC DEL (RMBS)
RAMBUS INC DEL (RMBS) appears in the most recent 13F filings of 5 tracked institutional investors. The largest disclosed position is held by Ken Griffin (Citadel Advisors), valued at $117M. Across recent filings, tracked investors recorded 3 new positions, 3 increased, 5 reduced, and 1 exited. All data sourced from SEC 13F filings.
Based on recent institutional activity in RMBS
How many top investors track RMBS
A small number of top investors own this.
RMBS Ownership Composition
How RAMBUS INC DEL is held across tracked investor types, based on reported 13F positions.
- Multi-Strategy / Quant80.5%
- Macro19.5%
Tracked investors currently reporting RMBS
1 tracked investor has since exited this position — listed separately below.
- Ken GriffinJun 30, 2026Citadel AdvisorsShares877.8KValue$116.5M% Portfolio0.01%
- Izzy EnglanderJun 30, 2026Millennium ManagementShares513.7KValue$68.2M% Portfolio0.02%
- Stanley DruckenmillerJun 30, 2026Duquesne Family OfficeShares173KValue$23M% Portfolio0.44%
- Paul Tudor JonesJun 30, 2026Tudor Investment CorpShares160.6KValue$21.3M% Portfolio0.03%
- Ray DalioJun 30, 2026Bridgewater AssociatesShares3.9KValue$513.8K% Portfolio0.00%
Previously held RMBS
These investors reported RMBS in an earlier quarter but not in their most recent 13F. Figures below are their last reported position, not a current holding.
| Investor | Firm | Last reported shares | Value then | Last held |
|---|---|---|---|---|
| Steve Cohen | Point72 Asset Management | 30K | $2.8M | Dec 31, 2025 |
Recent activity
- New$40.2KNov 14, 2025
- Sold$0(-100.00%)Feb 17, 2026
- New$287.3KAug 14, 2024
- Increased$2.6M(1150.73%)Nov 13, 2024
- Reduced$377.7K(-88.32%)Feb 13, 2025
- Increased$4M(992.78%)May 14, 2025
- Increased$14.5M(190.56%)Aug 13, 2025
- Reduced$18.2K(-22.81%)Nov 13, 2025
- Reduced$14.2M(-11.89%)Feb 13, 2026
- Reduced$4.5M(-66.39%)May 15, 2026
- Reduced$513.8K(-92.53%)Aug 14, 2026
- $23MAug 14, 2026
Frequently asked questions
- How many institutional investors hold RMBS?
- 5 tracked institutional investors disclosed a position in RMBS (RAMBUS INC DEL) in their most recent 13F filing.
- Who is the largest institutional holder of RMBS?
- Ken Griffin, Citadel Advisors, holds the largest disclosed position in RMBS, valued at $117M.
- Did institutional ownership of RMBS increase or decrease?
- Across recent 13F filings, tracked investors recorded 3 new positions, 3 increased, 5 reduced, and 1 fully exited RMBS.
- Where does this RMBS ownership data come from?
- SEC Form 13F-HR filings, accessed via EDGAR. 13F filings are disclosed quarterly with a 45-day reporting delay and cover U.S.-listed long equity positions only. This is not investment advice.