Rambus Inc.
US ˙ NasdaqGS ˙ US7509171069

SecurityRMBS / Rambus Inc.
InstitutionAmalgamated Bank
Latest Disclosed Ownership46,548 shares
Latest Disclosed Value $ 4,005
Amalgamated Bank reports 2.67% increase in ownership of RMBS / Rambus Inc.

On May 8, 2026 - Amalgamated Bank filed a 13F-HR form disclosing ownership of 46,548 shares of Rambus Inc. (US:RMBS) valued at $4,004,524 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 45,339 shares of Rambus Inc.. This represents a change in shares of 2.67% during the quarter. The current value of the position is $7,943,882 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)
2026-05-08 2026-03-31 13F RAMBUS COM 750917106 46,548 1,209 2.67 4 0.00 0.0306
2026-02-05 2025-12-31 13F RAMBUS COM 750917106 45,339 -1,885 -3.99 4 0.00 0.0301
2025-10-29 2025-09-30 13F RAMBUS COM 750917106 47,224 11 0.02 5 33.33 0.0352
2025-08-04 2025-06-30 13F RAMBUS COM 750917106 47,213 293 0.62 3 50.00 0.0233
2025-04-25 2025-03-31 13F RAMBUS COM 750917106 46,920 -1,927 -3.94 2 0.00 0.0208
2025-02-04 2024-12-31 13F RAMBUS COM 750917106 48,847 426 0.88 3 0.00 0.0212
2024-10-30 2024-09-30 13F RAMBUS COM 750917106 48,421 -3,938 -7.52 2 -33.33 0.0168
2024-08-12 2024-06-30 13F RAMBUS COM 750917106 52,359 -4,003 -7.10 3 0.00 0.0262
2024-04-23 2024-03-31 13F RAMBUS COM 750917106 56,362 -12,036 -17.60 3 -25.00 0.0298
2024-02-06 2023-12-31 13F RAMBUS COM 750917106 68,398 19,705 40.47 5 100.00 0.0372
2023-11-08 2023-09-30 13F RAMBUS COM 750917106 48,693 -723 -1.46 3 -33.33 0.0231
2023-08-11 2023-06-30 13F RAMBUS COM 750917106 49,416 908 1.87 3 50.00 0.0257
2023-05-02 2023-03-31 13F RAMBUS COM 750917106 48,508 -3,337 -6.44 2 100.00 0.0212
2023-02-10 2022-12-31 13F RAMBUS COM 750917106 51,845 -1,670 -3.12 2 -99.93 0.0166
2022-11-09 2022-09-30 13F RAMBUS COM 750917106 53,515 1,114 2.13 1,360 20.78 0.0131
2022-08-15 2022-06-30 13F RAMBUS COM 750917106 52,401 3,210 6.53 1,126 -28.23 0.0105
2022-08-25 2022-03-31 13F/A-1 RAMBUS COM 750917106 49,191 -2,302 -4.47 1,569 3.70 0.0122
2022-06-30 2022-03-31 13F RAMBUS COM 750917106 49,191 -2,302 1,569 0.0125
2022-02-15 2021-12-31 13F/A-1 RAMBUS COM 750917106 51,493 -701 -1.34 1,513 30.54 0.0112
2022-02-15 2021-12-31 13F RAMBUS COM 750917106 51,493 -701 1,513 0.0112
2021-10-29 2021-09-30 13F RAMBUS COM 750917106 52,194 -2,288 -4.20 1,159 -10.29 0.0098
2021-08-16 2021-06-30 13F RAMBUS COM 750917106 54,482 44,346 437.51 1,292 555.84 0.0104
2021-05-13 2021-03-31 13F RAMBUS COM 750917106 10,136 -667 -6.17 197 4.23 0.0074
2021-02-12 2020-12-31 13F RAMBUS COM 750917106 10,803 102 0.95 189 29.45 0.0072
2020-10-30 2020-09-30 13F RAMBUS COM 750917106 10,701 -84 -0.78 146 -10.98 0.0063
2020-08-10 2020-06-30 13F RAMBUS COM 750917106 10,785 -7,441 -40.83 164 -18.81 0.0076
2020-05-13 2020-03-31 13F RAMBUS COM 750917106 18,226 -629 -3.34 202 -22.31 0.0049
2020-02-13 2019-12-31 13F RAMBUS COM 750917106 18,855 1,983 11.75 260 17.65 0.0048
2019-11-13 2019-09-30 13F RAMBUS COM 750917106 16,872 -421 -2.43 221 6.25 0.0046
2019-08-14 2019-06-30 13F RAMBUS COM 750917106 17,293 1,401 8.82 208 25.30 0.0049
2019-05-15 2019-03-31 13F RAMBUS COM 750917106 15,892 469 3.04 166 40.68 0.0040
2019-02-15 2018-12-31 13F RAMBUS COM 750917106 15,423 -2 -0.01 118 -29.76 0.0033
2018-11-14 2018-09-30 13F RAMBUS COM 750917106 15,425 -270 -1.72 168 -14.72 0.0042
2018-07-18 2018-06-30 13F RAMBUS COM 750917106 15,695 260 1.68 197 -4.83 0.0048
2018-05-22 2018-03-31 13F RAMBUS COM 750917106 15,435 -256 -1.63 207 -7.17 0.0055
2018-02-13 2017-12-31 13F RAMBUS COM 750917106 15,691 998 6.79 223 13.78 0.0060
2017-11-09 2017-09-30 13F RAMBUS COM 750917106 14,693 -515 -3.39 196 12.64 0.0061
2017-08-10 2017-06-30 13F RAMBUS COM 750917106 15,208 549 3.75 174 -9.84 0.0057
2017-05-12 2017-03-31 13F RAMBUS COM 750917106 14,659 16 0.11 193 -4.46 0.0096
2017-02-14 2016-12-31 13F RAMBUS COM 750917106 14,643 1,763 13.69 202 25.47 0.0091
2016-11-15 2016-09-30 13F/A-1 RAMBUS COM 750917106 12,880 27 0.21 161 -7.47 0.0093
2016-08-16 2016-06-30 13F RAMBUS COM 750917106 12,853 697 5.73 174 4.19 0.0101
2016-05-11 2016-03-31 13F RAMBUS COM 750917106 12,156 1,096 9.91 167 30.47 0.0163
2016-02-10 2015-12-31 13F RAMBUS COM 750917106 11,060 -1,079 -8.89 128 -10.49 0.0158
2015-11-04 2015-09-30 13F RAMBUS COM 750917106 12,139 192 1.61 143 -17.34 0.0150
2015-07-10 2015-06-30 13F RAMBUS COM 750917106 11,947 391 3.38 173 19.31 0.0170
2015-04-22 2015-03-31 13F RAMBUS COM 750917106 11,556 11,556 0.00 145 0.0177
2015-01-29 2014-12-31 13F RAMBUS INC COM 750917106 0 -11,094 -100.00 0 -100.00
2014-11-14 2014-09-30 13F RAMBUS INC COM 750917106 11,094 -4 -0.04 138 -13.21 0.0205
2014-08-11 2014-06-30 13F RAMBUS INC COM 750917106 11,098 -374 -3.26 159 29.27 0.0240
2014-05-12 2014-03-31 13F RAMBUS INC COM 750917106 11,472 -100 -0.86 123 11.82 0.0212
2014-02-13 2013-12-31 13F RAMBUS INC COM 750917106 11,572 11,572 110 0.0187
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.