Rambus Inc.
US ˙ NasdaqGS ˙ US7509171069

SecurityRMBS / Rambus Inc.
InstitutionJustInvest LLC
Latest Disclosed Ownership22,144 shares
Latest Disclosed Value $ 1,905,048
JustInvest LLC reports 1.95% increase in ownership of RMBS / Rambus Inc.

On May 14, 2026 - JustInvest LLC filed a 13F-HR form disclosing ownership of 22,144 shares of Rambus Inc. (US:RMBS) valued at $1,905,048 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 21,720 shares of Rambus Inc.. This represents a change in shares of 1.95% during the quarter. The current value of the position is $3,217,745 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-14 2026-03-31 13F RAMBUS INC DEL COM 750917106 22,144 424 1.95 1,905 -4.51 0.0187
2026-02-13 2025-12-31 13F RAMBUS INC DEL COM 750917106 21,720 -99 -0.45 1,996 -12.23 0.0195
2025-10-31 2025-09-30 13F RAMBUS INC DEL COM 750917106 21,819 305 1.42 2,274 65.07 0.0233
2025-07-25 2025-06-30 13F RAMBUS INC DEL COM 750917106 21,514 825 3.99 1,377 28.57 0.0155
2025-05-14 2025-03-31 13F RAMBUS INC DEL COM 750917106 20,689 1,654 8.69 1,071 6.46 0.0158
2025-02-10 2024-12-31 13F RAMBUS INC DEL COM 750917106 19,035 4,088 27.35 1,006 59.43 0.0152
2024-11-12 2024-09-30 13F RAMBUS INC DEL COM 750917106 14,947 1,382 10.19 631 -20.83 0.0102
2024-08-12 2024-06-30 13F RAMBUS INC DEL COM 750917106 13,565 -1,989 -12.79 797 -17.07 0.0152
2024-05-09 2024-03-31 13F RAMBUS INC DEL COM 750917106 15,554 2,095 15.57 961 4.68 0.0206
2024-02-08 2023-12-31 13F RAMBUS INC DEL COM 750917106 13,459 1,807 15.51 919 41.23 0.0238
2023-11-08 2023-09-30 13F RAMBUS INC DEL COM 750917106 11,652 3,265 38.93 650 20.82 0.0194
2023-07-28 2023-06-30 13F RAMBUS INC DEL COM 750917106 8,387 414 5.19 538 31.86 0.0165
2023-05-10 2023-03-31 13F RAMBUS INC DEL COM 750917106 7,973 7,973 409 0.0142
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.