Rambus Inc.
US ˙ NasdaqGS ˙ US7509171069

SecurityRMBS / Rambus Inc.
InstitutionStifel Financial Corp
Latest Disclosed Ownership25,943 shares
Latest Disclosed Value $ 2,231,827
Stifel Financial Corp reports 11.98% decrease in ownership of RMBS / Rambus Inc.

On May 12, 2026 - Stifel Financial Corp filed a 13F-HR form disclosing ownership of 25,943 shares of Rambus Inc. (US:RMBS) valued at $2,231,876 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 29,473 shares of Rambus Inc.. This represents a change in shares of -11.98% during the quarter. The current value of the position is $4,393,447 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)
2026-05-12 2026-03-31 13F RAMBUS INC DEL COM 750917106 25,943 -3,530 -11.98 2,232 -17.61 0.0021
2026-02-13 2025-12-31 13F RAMBUS INC DEL COM 750917106 29,473 8,879 43.11 2,708 26.25 0.0024
2025-11-12 2025-09-30 13F RAMBUS INC DEL COM 750917106 20,594 3,323 19.24 2,146 94.12 0.0020
2025-08-14 2025-06-30 13F RAMBUS INC DEL COM 750917106 17,271 3,046 21.41 1,106 50.14 0.0011
2025-05-14 2025-03-31 13F RAMBUS INC DEL COM 750917106 14,225 2,022 16.57 737 14.11 0.0008
2025-02-13 2024-12-31 13F RAMBUS INC DEL COM 750917106 12,203 12,203 645 0.0007
2024-11-14 2024-09-30 13F RAMBUS INC DEL COM 750917106 0 -78,486 -100.00 0 -100.00
2024-08-13 2024-06-30 13F RAMBUS INC DEL COM 750917106 78,486 -3,663 -4.46 4,612 -9.18 0.0052
2024-05-14 2024-03-31 13F RAMBUS INC DEL COM 750917106 82,149 -1,907 -2.27 5,078 -11.49 0.0058
2024-02-12 2023-12-31 13F RAMBUS INC DEL COM 750917106 84,056 -5,421 -6.06 5,737 14.93 0.0072
2023-11-13 2023-09-30 13F RAMBUS INC DEL COM 750917106 89,477 -1,601 -1.76 4,992 -14.60 0.0070
2023-08-14 2023-06-30 13F RAMBUS INC DEL COM 750917106 91,078 -1,245 -1.35 5,844 23.50 0.0080
2023-05-12 2023-03-31 13F RAMBUS INC DEL COM 750917106 92,323 -1,146 -1.23 4,732 41.34 0.0068
2023-02-13 2022-12-31 13F RAMBUS INC DEL COM 750917106 93,469 -880 -0.93 3,348 39.62 0.0050
2022-11-14 2022-09-30 13F RAMBUS INC DEL COM 750917106 94,349 -662 -0.70 2,398 17.43 0.0039
2022-08-15 2022-06-30 13F RAMBUS INC DEL COM 750917106 95,011 506 0.54 2,042 -32.25 0.0032
2022-05-13 2022-03-31 13F RAMBUS INC DEL COM 750917106 94,505 3,175 3.48 3,014 12.30 0.0041
2022-02-14 2021-12-31 13F RAMBUS INC DEL COM 750917106 91,330 841 0.93 2,684 33.60 0.0035
2021-11-15 2021-09-30 13F RAMBUS INC DEL COM 750917106 90,489 741 0.83 2,009 -5.59 0.0029
2021-08-13 2021-06-30 13F RAMBUS INC DEL COM 750917106 89,748 3,566 4.14 2,128 27.04 0.0032
2021-05-14 2021-03-31 13F RAMBUS INC DEL COM 750917106 86,182 6,315 7.91 1,675 20.16 0.0028
2021-02-12 2020-12-31 13F RAMBUS INC DEL COM 750917106 79,867 79,867 1,394 0.0025
2020-05-14 2020-03-31 13F RAMBUS INC DEL COM 750917106 0 -90,268 -100.00 0 -100.00
2020-02-13 2019-12-31 13F RAMBUS INC DEL COM 750917106 90,268 -83,430 -48.03 1,244 -45.41 0.0026
2019-11-19 2019-09-30 13F/A-1 RAMBUS INC DEL COM 750917106 173,698 1,786 1.04 2,279 10.15 0.0058
2019-11-13 2019-09-30 13F RAMBUS INC DEL COM 750917106 173,698 1,786 2,279 1,277.4937
2019-08-14 2019-06-30 13F RAMBUS INC DEL COM 750917106 171,912 -170,993 -49.87 2,069 -42.66 0.0053
2019-05-14 2019-03-31 13F RAMBUS INC DEL COM 750917106 342,905 25,631 8.08 3,608 41.77 0.0102
2019-02-13 2018-12-31 13F RAMBUS INC DEL COM 750917106 317,274 -47,495 -13.02 2,545 -36.14 0.0082
2018-11-13 2018-09-30 13F RAMBUS INC DEL COM 750917106 364,769 -2,465 -0.67 3,985 -13.16 0.0114
2018-08-14 2018-06-30 13F RAMBUS INC DEL COM 750917106 367,234 367,234 4,589 0.0141
2018-05-11 2018-03-31 13F RAMBUS INC DEL COM 750917106 0 -95,820 -100.00 0 -100.00
2018-02-14 2017-12-31 13F RAMBUS INC DEL COM 750917106 95,820 95,820 1,365 0.0043
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.