Rambus Inc.
DE ˙ DB ˙ US7509171069
142,95 € ↓ -5,25 (-3,54%)
2026-06-04
DEL PRIS
SecurityDE:RMB / Rambus Inc.
InstitutionProShare Advisors LLC
Latest Disclosed Ownership29,844 shares
Latest Disclosed Value $ 2,567,479
ProShare Advisors LLC reports 20.98% decrease in ownership of RMB / Rambus Inc.

On April 24, 2026 - ProShare Advisors LLC filed a 13F-HR form disclosing ownership of 29,844 shares of Rambus Inc. (DE:RMB) valued at $2,118,327 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 6, 2026 disclosing 37,770 shares of Rambus Inc.. This represents a change in shares of -20.98% during the quarter. The current value of the position is $4,266,200 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)
2026-04-24 2026-03-31 13F RAMBUS INC DEL COM 750917106 29,844 -7,926 -20.98 2,567 -26.02 0.0038
2026-02-06 2025-12-31 13F RAMBUS INC DEL COM 750917106 37,770 4,812 14.60 3,471 1.05 0.0061
2025-11-06 2025-09-30 13F RAMBUS INC DEL COM 750917106 32,958 -6,742 -16.98 3,434 35.14 0.0072
2025-08-07 2025-06-30 13F RAMBUS INC DEL COM 750917106 39,700 -618 -1.53 2,542 21.75 0.0051
2025-05-08 2025-03-31 13F RAMBUS INC DEL COM 750917106 40,318 -8,709 -17.76 2,087 -19.45 0.0047
2025-02-14 2024-12-31 13F RAMBUS INC DEL COM 750917106 49,027 9,546 24.18 2,592 55.52 0.0059
2024-11-14 2024-09-30 13F RAMBUS INC DEL COM 750917106 39,481 5,010 14.53 1,667 -17.73 0.0041
2024-08-13 2024-06-30 13F RAMBUS INC DEL COM 750917106 34,471 -3,188 -8.47 2,026 -12.98 0.0054
2024-05-08 2024-03-31 13F RAMBUS INC DEL COM 750917106 37,659 4,692 14.23 2,328 3.47 0.0062
2024-02-14 2023-12-31 13F RAMBUS INC DEL COM 750917106 32,967 6,929 26.61 2,250 54.89 0.0069
2023-11-13 2023-09-30 13F RAMBUS INC DEL COM 750917106 26,038 9,003 52.85 1,453 32.85 0.0045
2023-08-10 2023-06-30 13F RAMBUS INC DEL COM 750917106 17,035 1,520 9.80 1,093 37.48 0.0032
2023-05-26 2023-03-31 13F/A-1 RAMBUS INC DEL COM 750917106 15,515 -1,373 -8.13 795 31.62 0.0024
2023-05-12 2023-03-31 13F RAMBUS INC DEL COM 750917106 15,515 -1,373 795 0.0025
2023-02-02 2022-12-31 13F RAMBUS INC DEL COM 750917106 16,888 1,793 11.88 605 57.70 0.0021
2022-11-07 2022-09-30 13F RAMBUS INC DEL COM 750917106 15,095 -383 -2.47 383 15.36 0.0015
2022-08-01 2022-06-30 13F RAMBUS INC DEL COM 750917106 15,478 -8,678 -35.92 332 -56.94 0.0011
2022-05-10 2022-03-31 13F RAMBUS INC DEL COM 750917106 24,156 -2,967 -10.94 771 -3.38 0.0017
2022-02-08 2021-12-31 13F RAMBUS INC DEL COM 750917106 27,123 10,411 62.30 798 115.09 0.0016
2021-11-12 2021-09-30 13F RAMBUS INC DEL COM 750917106 16,712 -15,425 -48.00 371 -51.31 0.0010
2021-08-13 2021-06-30 13F RAMBUS INC DEL COM 750917106 32,137 -1,471 -4.38 762 16.69 0.0022
2021-05-14 2021-03-31 13F RAMBUS INC DEL COM 750917106 33,608 6,296 23.05 653 36.90 0.0021
2021-02-09 2020-12-31 13F RAMBUS INC DEL COM 750917106 27,312 11,357 71.18 477 118.81 0.0018
2020-11-13 2020-09-30 13F RAMBUS INC DEL COM 750917106 15,955 -1,358 -7.84 218 -17.11 0.0010
2020-08-03 2020-06-30 13F RAMBUS INC DEL COM 750917106 17,313 17,313 263 0.0014
2020-05-15 2020-03-31 13F RAMBUS INC DEL COM 750917106 0 -18,038 -100.00 0 -100.00
2020-02-12 2019-12-31 13F RAMBUS INC DEL COM 750917106 18,038 2,644 17.18 248 22.77 0.0011
2019-11-12 2019-09-30 13F RAMBUS INC DEL COM 750917106 15,394 946 6.55 202 16.09 0.0011
2019-08-13 2019-06-30 13F RAMBUS INC DEL COM 750917106 14,448 -281 -1.91 174 12.99 0.0010
2019-05-15 2019-03-31 13F RAMBUS INC DEL COM 750917106 14,729 450 3.15 154 40.00 0.0009
2019-02-14 2018-12-31 13F RAMBUS INC DEL COM 750917106 14,279 -1,474 -9.36 110 -36.05 0.0008
2018-11-14 2018-09-30 13F RAMBUS INC DEL COM 750917106 15,753 -1,760 -10.05 172 -21.82 0.0012
2018-08-13 2018-06-30 13F RAMBUS INC DEL COM 750917106 17,513 243 1.41 220 -5.17 0.0015
2018-05-14 2018-03-31 13F RAMBUS INC DEL COM 750917106 17,270 -2,168 -11.15 232 -15.94 0.0015
2018-02-14 2017-12-31 13F RAMBUS INC DEL COM 750917106 19,438 19,438 276 0.0019
2017-11-13 2017-09-30 13F RAMBUS INC DEL COM 750917106 0 -11,464 -100.00 0 -100.00
2017-08-11 2017-06-30 13F RAMBUS INC DEL COM 750917106 11,464 -3,644 -24.12 131 -34.17 0.0013
2017-05-12 2017-03-31 13F/A-2 RAMBUS INC DEL COM 750917106 15,108 -4,819 -24.18 199 -27.37 0.0021
2017-05-08 2017-03-31 13F/A-1 RAMBUS INC DEL COM 750917106 15,108 0 199 0.0021
2017-04-25 2017-03-31 13F RAMBUS INC DEL COM 750917106 15,108 199
2017-02-13 2016-12-31 13F RAMBUS INC DEL COM 750917106 19,927 7,012 54.29 274 70.19 0.0030
2016-11-10 2016-09-30 13F RAMBUS INC DEL COM 750917106 12,915 -2,855 -18.10 161 -15.71 0.0022
2016-08-12 2016-06-30 13F RAMBUS INC DEL COM 750917106 15,770 -872 -5.24 191 -16.59 0.0025
2016-05-06 2016-03-31 13F RAMBUS INC DEL COM 750917106 16,642 -3,060 -15.53 229 0.44 0.0032
2016-02-05 2015-12-31 13F RAMBUS INC DEL COM 750917106 19,702 8,696 79.01 228 75.38 0.0028
2015-11-06 2015-09-30 13F RAMBUS INC DEL COM 750917106 11,006 -3,567 -24.48 130 -38.39 0.0018
2015-08-11 2015-06-30 13F RAMBUS INC DEL COM 750917106 14,573 -7,403 -33.69 211 -23.55 0.0029
2015-05-08 2015-03-31 13F RAMBUS INC DEL COM 750917106 21,976 21,976 0.00 276 0.0033
2015-01-30 2014-12-31 13F RAMBUS INC DEL COM 750917106 0 -45,190 -100.00 0 -100.00
2014-11-06 2014-09-30 13F RAMBUS INC DEL COM 750917106 45,190 -10,240 -18.47 564 -28.88 0.0075
2014-08-08 2014-06-30 13F RAMBUS INC DEL COM 750917106 55,430 -57,598 -50.96 793 -34.73 0.0103
2014-05-07 2014-03-31 13F RAMBUS INC DEL COM 750917106 113,028 113,028 60.27 1,215 83.26 0.0152
2014-02-04 2013-12-31 13F RAMBUS INC DEL COM 750917106 0 -70,524 -100.00 0 -100.00
2013-11-07 2013-09-30 13F RAMBUS INC DEL COM 750917106 70,524 -766 -1.07 663 8.33 0.0157
2013-07-25 2013-06-30 13F RAMBUS INC DEL COM 750917106 71,290 71,290 612 0.0120
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.