Rambus Inc.
US ˙ NasdaqGS ˙ US7509171069

SecurityRMBS / Rambus Inc.
InstitutionAmundi
Latest Disclosed Ownership16,384 shares
Latest Disclosed Value $ 1,409,516
Amundi reports 32.44% increase in ownership of RMBS / Rambus Inc.

On May 15, 2026 - Amundi filed a 13F-HR form disclosing ownership of 16,384 shares of Rambus Inc. (US:RMBS) valued at $1,409,516 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 12,371 shares of Rambus Inc.. This represents a change in shares of 32.44% during the quarter. The current value of the position is $2,796,093 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)
2026-05-15 2026-03-31 13F RAMBUS INC DEL COM 750917106 16,384 4,013 32.44 1,410 24.03 0.0002
2026-02-17 2025-12-31 13F RAMBUS INC DEL COM 750917106 12,371 4,760 62.54 1,137 47.92 0.0003
2025-11-14 2025-09-30 13F RAMBUS INC DEL COM 750917106 7,611 0 0.00 769 55.47 0.0002
2025-08-13 2025-06-30 13F RAMBUS INC DEL COM 750917106 7,611 2,886 61.08 495 126.61 0.0002
2025-05-15 2025-03-31 13F RAMBUS COM 750917106 4,725 -15,648 -76.81 218 -81.24 0.0001
2025-02-07 2024-12-31 13F RAMBUS COM 750917106 20,373 20,373 1,163 0.0004
2024-05-15 2024-03-31 13F RAMBUS COM 750917106 0 -114,695 -100.00 0 -100.00
2024-02-14 2023-12-31 13F RAMBUS COM 750917106 114,695 -57,612 -33.44 7,650 -22.42 0.0034
2023-11-14 2023-09-30 13F RAMBUS COM 750917106 172,307 -41,708 -19.49 9,861 -27.91 0.0048
2023-08-14 2023-06-30 13F RAMBUS COM 750917106 214,015 199,288 1,353.22 13,680 1,791.98 0.0069
2023-05-15 2023-03-31 13F RAMBUS COM 750917106 14,727 14,727 723 0.0004
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.