Rambus Inc.
US ˙ NasdaqGS ˙ US7509171069

SecurityRMBS / Rambus Inc.
InstitutionFifth Third Bancorp
Latest Disclosed Ownership27,361 shares
Latest Disclosed Value $ 2,353,866
Fifth Third Bancorp reports 1,675.54% increase in ownership of RMBS / Rambus Inc.

On May 1, 2026 - Fifth Third Bancorp filed a 13F-HR form disclosing ownership of 27,361 shares of Rambus Inc. (US:RMBS) valued at $2,353,867 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 2, 2026 disclosing 1,541 shares of Rambus Inc.. This represents a change in shares of 1,675.54% during the quarter. The current value of the position is $4,669,428 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)
2026-05-01 2026-03-31 13F RAMBUS INC DEL COM 750917106 27,361 25,820 1,675.54 2,354 1,568.79 0.0043
2026-02-02 2025-12-31 13F RAMBUS INC DEL COM 750917106 1,541 13 0.85 142 -11.32 0.0004
2025-11-07 2025-09-30 13F RAMBUS INC DEL COM 750917106 1,528 31 2.07 159 67.37 0.0005
2025-07-15 2025-06-30 13F RAMBUS INC DEL COM 750917106 1,497 79 5.57 96 30.14 0.0003
2025-04-15 2025-03-31 13F RAMBUS INC DEL COM 750917106 1,418 282 24.82 73 21.67 0.0003
2025-01-21 2024-12-31 13F RAMBUS INC DEL COM 750917106 1,136 150 15.21 60 46.34 0.0002
2024-10-17 2024-09-30 13F RAMBUS INC DEL COM 750917106 986 259 35.63 42 -2.38 0.0002
2024-07-22 2024-06-30 13F RAMBUS INC DEL COM 750917106 727 296 68.68 43 61.54 0.0002
2024-04-23 2024-03-31 13F RAMBUS INC DEL COM 750917106 431 -73 -14.48 27 -23.53 0.0001
2024-01-19 2023-12-31 13F RAMBUS INC DEL COM 750917106 504 200 65.79 34 112.50 0.0001
2023-10-31 2023-09-30 13F RAMBUS INC DEL COM 750917106 304 22 7.80 17 -11.11 0.0001
2023-07-26 2023-06-30 13F RAMBUS INC DEL COM 750917106 282 25 9.73 18 38.46 0.0001
2023-04-24 2023-03-31 13F RAMBUS INC DEL COM 750917106 257 22 9.36 13 62.50 0.0001
2023-01-25 2022-12-31 13F RAMBUS INC DEL COM 750917106 235 6 2.62 8 33.33 0.0000
2022-10-25 2022-09-30 13F RAMBUS INC DEL COM 750917106 229 -19 -7.66 6 20.00 0.0000
2022-08-04 2022-06-30 13F RAMBUS INC DEL COM 750917106 248 60 31.91 5 -16.67 0.0000
2022-04-19 2022-03-31 13F RAMBUS INC DEL COM 750917106 188 0 0.00 6 0.00 0.0000
2022-02-01 2021-12-31 13F RAMBUS INC DEL COM 750917106 188 70 59.32 6 100.00 0.0000
2021-10-15 2021-09-30 13F RAMBUS INC DEL COM 750917106 118 118 3 0.0000
2018-05-15 2018-03-31 13F RAMBUS INC DEL COM 750917106 0 -53 -100.00 0 -100.00
2018-02-14 2017-12-31 13F RAMBUS INC DEL COM 750917106 53 0 0.00 1 0.00 0.0000
2017-11-14 2017-09-30 13F RAMBUS INC DEL COM 750917106 53 0 0.00 1 0.00 0.0000
2017-08-11 2017-06-30 13F RAMBUS INC DEL COM 750917106 53 0 0.00 1 0.00 0.0000
2017-05-12 2017-03-31 13F RAMBUS INC DEL COM 750917106 53 0 0.00 1 0.00 0.0000
2017-02-13 2016-12-31 13F/A-1 RAMBUS INC DEL COM 750917106 53 53 0.00 1 0.0000
2016-05-13 2016-03-31 13F RAMBUS INC DEL COM 750917106 0 -325 -100.00 0 -100.00
2016-02-16 2015-12-31 13F RAMBUS INC DEL COM 750917106 325 325 0.00 4 0.0000
2014-11-17 2014-09-30 13F RAMBUS INC DEL COM 750917106 0 -14 -100.00 0 0.0000
2014-08-14 2014-06-30 13F RAMBUS INC DEL COM 750917106 14 14 0 0.0000
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.