Rambus Inc.
DE ˙ DB ˙ US7509171069
142,95 € ↓ -5,25 (-3,54%)
2026-06-04
DEL PRIS
SecurityDE:RMB / Rambus Inc.
InstitutionComerica Bank
Latest Disclosed Ownership30,625 shares
Latest Disclosed Value $ 2,814,144
Comerica Bank reports 45.20% decrease in ownership of RMB / Rambus Inc.

On January 29, 2026 - Comerica Bank filed a 13F-HR form disclosing ownership of 30,625 shares of Rambus Inc. (DE:RMB) valued at $2,421,825 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 14, 2025 disclosing 55,890 shares of Rambus Inc.. This represents a change in shares of -45.20% during the quarter. The current value of the position is $4,377,844 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)
2026-01-29 2025-12-31 13F RAMBUS INC DEL COM 750917106 30,625 -25,265 -45.20 2,814 -51.67 0.0112
2025-11-14 2025-09-30 13F RAMBUS INC DEL COM 750917106 55,890 -27,869 -33.27 5,824 8.60 0.0219
2025-08-14 2025-06-30 13F RAMBUS INC DEL COM 750917106 83,759 -17,253 -17.08 5,362 2.54 0.0208
2025-05-14 2025-03-31 13F RAMBUS INC DEL COM 750917106 101,012 -19,645 -16.28 5,230 -18.00 0.0220
2025-02-14 2024-12-31 13F/A-1 RAMBUS INC DEL COM 750917106 120,657 21,647 21.86 6,378 52.56 0.0257
2025-02-14 2024-12-31 13F RAMBUS INC DEL COM 750917106 120,657 21,647 6,378 0.0214
2024-11-14 2024-09-30 13F RAMBUS INC DEL COM 750917106 99,010 19,545 24.60 4,180 -10.47 0.0165
2024-08-15 2024-06-30 13F RAMBUS COMMON 750917106 79,465 10,070 14.51 4,669 8.86 0.0194
2024-05-16 2024-03-31 13F RAMBUS COMMON 750917106 69,395 23,526 51.29 4,289 37.03 0.0185
2024-02-14 2023-12-31 13F RAMBUS COMMON 750917106 45,869 -7,087 -13.38 3,131 5.96 0.0144
2023-11-21 2023-09-30 13F RAMBUS INC DEL COMMON 750917106 52,956 52,956 2,954 0.0154
2023-08-22 2023-06-30 13F RAMBUS EQU 750917106 0 -65,236 -100.00 0 -100.00
2023-01-26 2022-12-31 13F RAMBUS COM 750917106 65,236 -21,660 -24.93 3 -99.92 0.0200
2022-10-28 2022-09-30 13F RAMBUS COM 750917106 86,896 -9,337 -9.70 2,514 13.50 0.0212
2022-08-02 2022-06-30 13F RAMBUS COM 750917106 96,233 3,157 3.39 2,215 -10.69 0.0182
2022-04-27 2022-03-31 13F RAMBUS COM 750917106 93,076 -2,222 -2.33 2,480 6.94 0.0180
2022-02-18 2021-12-31 13F RAMBUS COM 750917106 95,298 -3,665 -3.70 2,319 3.02 0.0171
2021-11-22 2021-09-30 13F RAMBUS COM 750917106 98,963 -6,573 -6.23 2,251 -8.79 0.0136
2021-08-26 2021-06-30 13F RAMBUS COM 750917106 105,536 -7,588 -6.71 2,468 10.57 0.0147
2021-04-28 2021-03-31 13F RAMBUS COM 750917106 113,124 -6,812 -5.68 2,232 -9.82 0.0133
2021-01-28 2020-12-31 13F RAMBUS COM 750917106 119,936 -41,662 -25.78 2,475 7.42 0.0157
2020-10-30 2020-09-30 13F RAMBUS COM 750917106 161,598 2,990 1.89 2,304 -1.12 0.0167
2020-07-31 2020-06-30 13F RAMBUS COM 750917106 158,608 49,652 45.57 2,330 76.25 0.0180
2020-05-01 2020-03-31 13F RAMBUS COM 750917106 108,956 3,732 3.55 1,322 -22.24 0.0121
2020-02-07 2019-12-31 13F RAMBUS COM 750917106 105,224 781 0.75 1,700 21.00 0.0129
2019-10-31 2019-09-30 13F RAMBUS COM 750917106 104,443 1,284 1.24 1,405 12.85 0.0111
2019-08-02 2019-06-30 13F RAMBUS COM 750917106 103,159 -5,216 -4.81 1,245 3.06 0.0100
2019-05-02 2019-03-31 13F RAMBUS COM 750917106 108,375 3,113 2.96 1,208 35.12 0.0098
2019-02-06 2018-12-31 13F RAMBUS COM 750917106 105,262 1,454 1.40 894 -5.10 0.0076
2018-11-01 2018-09-30 13F RAMBUS COM 750917106 103,808 -9,780 -8.61 942 -35.61 0.0076
2018-08-01 2018-06-30 13F RAMBUS COM 750917106 113,588 -1,862 -1.61 1,463 -8.96 0.0102
2018-05-01 2018-03-31 13F RAMBUS COM 750917106 115,450 2,703 2.40 1,607 2.10 0.0115
2018-02-02 2017-12-31 13F RAMBUS COM 750917106 112,747 -2,535 -2.20 1,574 -5.64 0.0105
2017-11-06 2017-09-30 13F RAMBUS COM 750917106 115,282 -1,869 -1.60 1,668 12.63 0.0121
2017-08-03 2017-06-30 13F RAMBUS COM 750917106 117,151 -6,010 -4.88 1,481 -6.15 0.0111
2017-05-03 2017-03-31 13F RAMBUS COM 750917106 123,161 5,759 4.91 1,578 -3.60 0.0120
2017-02-08 2016-12-31 13F RAMBUS COM 750917106 117,402 7,489 6.81 1,637 7.91 0.0130
2016-08-11 2016-06-30 13F RAMBUS COM 750917106 109,913 -1,344 -1.21 1,517 -0.26 0.0131
2016-05-11 2016-03-31 13F RAMBUS COM 750917106 111,257 -6,808 -5.77 1,521 17.63 0.0136
2016-02-05 2015-12-31 13F RAMBUS COM 750917106 118,065 118,065 6.12 1,293 -14.99 0.0127
2014-08-12 2014-06-30 13F RAMBUS COM 750917106 0 -10,340 -100.00 0 -100.00
2014-05-15 2014-03-31 13F RAMBUS COM 750917106 10,340 183 1.80 111 15.63 0.0009
2014-02-11 2013-12-31 13F RAMBUS COM 750917106 10,157 -173 -1.67 96 -1.03 0.0007
2013-11-12 2013-09-30 13F RAMBUS COM 750917106 10,330 -38 -0.37 97 8.99 0.0007
2013-08-13 2013-06-30 13F/A-1 RAMBUS COM 750917106 10,368 10,368 89 0.0007
2013-08-08 2013-06-30 13F RAMBUS COM 750917106 20,736 178
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.