Rambus Inc.
US ˙ NasdaqGS ˙ US7509171069

SecurityRMBS / Rambus Inc.
InstitutionVanguard Group Inc
Latest Disclosed Ownership0 shares
Ownership 0.00%
Vanguard Group Inc ownership in RMBS / Rambus Inc.

2026-03-27 - Vanguard Group Inc has filed an SCHEDULE 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 0 shares of Rambus Inc. (US:RMBS). This represents 0.0 percent ownership of the company. In their previous filing dated 2024-11-12 , Vanguard Group Inc had reported owning 12,563,334 shares, indicating a decrease of -100.00 percent.

Institutional Ownership: 13D/G Filings

This table shows a history of the 13D/G filings made by the investor and/or investor group. Note that the share values in this table are not directly comparable to any numbers shown in the 13F table (if any).

File
Date		Effective
Date		Form Prev
Shares		 Latest
Shares		 ΔShares
(Percent)		 Ownership
(Percent)		 ΔOwnership
(Percent)
2026-03-27 2026-03-27 13G/A 12,563,334 0 -100.00 0.00 -100.00
2024-11-12 2024-11-12 13G/A 12,563,334 12,563,334 0.00 11.66 0.00
2024-11-04 2024-11-04 13G/A 11,375,954 12,563,334 10.44 11.66 10.21
2024-02-13 2024-02-13 13G/A 12,480,580 11,375,954 -8.85 10.58 -8.87
2023-02-09 2023-02-09 13G/A 11,861,940 12,480,580 5.22 11.61 7.00
2022-02-10 2022-02-10 13G/A 11,704,272 11,861,940 1.35 10.85 5.65
2021-02-10 2021-02-10 13G/A 12,010,103 11,704,272 -2.55 10.27 -4.64
2020-02-12 2020-02-12 13G/A 11,083,907 12,010,103 8.36 10.77 6.95
2019-04-08 2019-04-08 13G/A 8,905,645 11,083,907 24.46 10.07 22.80
2019-02-12 2019-02-12 13G/A 10,775,002 8,905,645 -17.35 8.20 -18.16
2018-08-08 2018-08-08 13G/A 10,247,860 10,775,002 5.14 10.02 7.40
2018-02-12 2018-02-12 13G/A 9,334,245 10,247,860 9.79 9.33 10.41
2017-02-13 2017-02-13 13G/A 9,334,245 9,334,245 0.00 8.45 0.00
2017-02-11 2017-02-11 13G/A 8,908,755 9,334,245 4.78 8.45 10.60
2016-02-10 2016-02-10 13G/A 8,908,755 7.64
2015-02-10 2015-02-10 13G/A 6,877,454 5.99
2014-02-12 2014-02-12 13G/A 6,855,933 6.08
2013-02-13 2013-02-13 13G 5,572,908 5.02

Important Note: One of the primary uses of the 13D/G filings is to evaluate the ability of a firm to control a company (ie, the "beneficial ownership"). To that end, firms are required to report not just direct holdings in companies, but indirect holdings that they control. For investment firms, these indirect holdings can include shares in funds they manage, advisory accounts, and in the case of activist campaigns, pledged votes. Therefore, share counts listed in 13D/G filings can differ significantly than share counts listed in 13F filings.

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.

Upgrade to unlock premium data and export to Excel .

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 12,290,929 -410,844 -3.23 1,129,413 -14.67 0.0164
2025-11-07 2025-09-30 13F RAMBUS INC DEL COM 750917106 12,701,773 140,948 1.12 1,323,525 64.59 0.0198
2025-08-11 2025-06-30 13F RAMBUS INC DEL COM 750917106 12,560,825 118,413 0.95 804,144 24.83 0.0130
2025-05-09 2025-03-31 13F RAMBUS INC DEL COM 750917106 12,442,412 -152,567 -1.21 644,206 -3.24 0.0116
2025-02-11 2024-12-31 13F RAMBUS INC DEL COM 750917106 12,594,979 31,645 0.25 665,771 25.52 0.0116
2024-11-13 2024-09-30 13F RAMBUS INC DEL COM 750917106 12,563,334 774,156 6.57 530,424 -23.43 0.0095
2024-08-13 2024-06-30 13F RAMBUS INC DEL COM 750917106 11,789,178 138,064 1.18 692,732 -3.81 0.0133
2024-05-10 2024-03-31 13F RAMBUS INC DEL COM 750917106 11,651,114 275,160 2.42 720,155 -7.25 0.0143
2024-03-11 2023-12-31 13F/A-1 RAMBUS INC DEL COM 750917106 11,375,954 -1,394,902 -10.92 776,409 8.97 0.0170
2024-02-14 2023-12-31 13F RAMBUS INC DEL COM 750917106 11,375,954 -1,394,902 776,409 0.0147
2023-12-18 2023-09-30 13F/A-1 RAMBUS INC DEL COM 750917106 12,770,856 -48,623 -0.38 712,486 -13.39 0.0175
2023-11-14 2023-09-30 13F RAMBUS INC DEL COM 750917106 12,770,856 -48,623 712,486 0.0032
2023-08-14 2023-06-30 13F RAMBUS INC DEL COM 750917106 12,819,479 150,432 1.19 822,626 26.67 0.0195
2023-07-14 2023-03-31 13F/A-1 RAMBUS INC DEL COM 750917106 12,669,047 188,467 1.51 649,415 45.27 0.0165
2023-05-15 2023-03-31 13F RAMBUS INC DEL COM 750917106 12,669,047 188,467 649,415 0.0035
2023-02-10 2022-12-31 13F RAMBUS INC DEL COM 750917106 12,480,580 -106,386 -0.85 447,054 39.72 0.0122
2022-11-14 2022-09-30 13F RAMBUS INC DEL COM 750917106 12,586,966 314,467 2.56 319,960 21.32 0.0094
2022-08-12 2022-06-30 13F RAMBUS INC DEL COM 750917106 12,272,499 241,619 2.01 263,736 -31.26 0.0074
2022-05-13 2022-03-31 13F RAMBUS INC DEL COM 750917106 12,030,880 168,940 1.42 383,665 10.05 0.0091
2022-02-14 2021-12-31 13F RAMBUS INC DEL COM 750917106 11,861,940 52,720 0.45 348,622 32.98 0.0079
2021-11-12 2021-09-30 13F RAMBUS INC DEL COM 750917106 11,809,220 -399,702 -3.27 262,165 -9.43 0.0065
2021-08-13 2021-06-30 13F RAMBUS INC DEL COM 750917106 12,208,922 224,767 1.88 289,474 24.25 0.0072
2021-05-14 2021-03-31 13F RAMBUS INC DEL COM 750917106 11,984,155 279,883 2.39 232,972 14.00 0.0063
2021-02-12 2020-12-31 13F RAMBUS INC DEL COM 750917106 11,704,272 63,081 0.54 204,356 28.23 0.0059
2020-11-16 2020-09-30 13F RAMBUS INC DEL COM 750917106 11,641,191 -494,038 -4.07 159,368 -13.60 0.0053
2020-08-14 2020-06-30 13F RAMBUS INC DEL COM 750917106 12,135,229 -12,392 -0.10 184,455 36.80 0.0065
2020-05-15 2020-03-31 13F RAMBUS INC DEL COM 750917106 12,147,621 137,518 1.15 134,838 -18.50 0.0057
2020-02-14 2019-12-31 13F RAMBUS INC DEL COM 750917106 12,010,103 134,791 1.14 165,439 6.14 0.0056
2019-11-14 2019-09-30 13F RAMBUS INC DEL COM 750917106 11,875,312 200,960 1.72 155,863 10.89 0.0058
2019-08-14 2019-06-30 13F RAMBUS INC DEL COM 750917106 11,674,352 590,445 5.33 140,560 21.35 0.0053
2019-05-15 2019-03-31 13F RAMBUS INC DEL COM 750917106 11,083,907 2,178,262 24.46 115,827 69.57 0.0045
2019-02-14 2018-12-31 13F RAMBUS INC DEL COM 750917106 8,905,645 -2,031,293 -18.57 68,307 -42.75 0.0031
2018-12-13 2018-09-30 13F/A-2 RAMBUS INC DEL COM 750917106 10,936,938 277,298 2.60 119,321 -10.74 0.0047
2018-11-23 2018-09-30 13F/A-1 RAMBUS INC DEL COM 750917106 10,936,938 0 119,321 0.0047
2018-11-14 2018-09-30 13F RAMBUS INC DEL COM 750917106 10,936,938 277,298 119,321
2018-08-14 2018-06-30 13F RAMBUS INC DEL COM 750917106 10,659,640 207,008 1.98 133,672 -4.78 0.0056
2018-05-15 2018-03-31 13F RAMBUS INC DEL COM 750917106 10,452,632 204,772 2.00 140,380 -3.67 0.0061
2018-02-14 2017-12-31 13F RAMBUS INC DEL COM 750917106 10,247,860 105,220 1.04 145,724 7.62 0.0064
2017-11-14 2017-09-30 13F RAMBUS INC DEL COM 750917106 10,142,640 106,413 1.06 135,405 18.04 0.0063
2017-08-24 2017-06-30 13F/A-1 RAMBUS INC DEL COM 750917106 10,036,227 188,666 1.92 114,714 -11.35 0.0057
2017-08-11 2017-06-30 13F RAMBUS INC DEL COM 750917106 10,036,227 188,666 114,714
2017-05-12 2017-03-31 13F RAMBUS INC DEL COM 750917106 9,847,561 513,316 5.50 129,396 0.67 0.0067
2017-02-14 2016-12-31 13F RAMBUS INC DEL COM 750917106 9,334,245 335,039 3.72 128,533 14.26 0.0072
2016-11-14 2016-09-30 13F RAMBUS INC DEL COM 750917106 8,999,206 158,431 1.79 112,490 5.33 0.0066
2016-08-10 2016-06-30 13F RAMBUS INC DEL COM 750917106 8,840,775 49,968 0.57 106,797 -11.65 0.0066
2016-05-13 2016-03-31 13F RAMBUS INC DEL COM 750917106 8,790,807 -117,948 -1.32 120,874 17.07 0.0078
2016-02-08 2015-12-31 13F RAMBUS INC DEL COM 750917106 8,908,755 983,528 12.41 103,253 10.41 0.0069
2015-11-12 2015-09-30 13F/A-1 RAMBUS INC DEL COM 750917106 7,925,227 116,320 1.49 93,517 -17.35 0.0040
2015-11-12 2015-09-30 13F/A-1 RAMBUS INC DEL COM 750917106 7,925,227 116,320 93,517 0.0040
2015-08-13 2015-06-30 13F RAMBUS INC DEL COM 750917106 7,808,907 639,287 8.92 113,151 25.50 0.0076
2015-05-15 2015-03-31 13F/A-1 RAMBUS INC DEL COM 750917106 7,169,620 292,166 4.25 90,159 18.21 0.0061
2015-05-14 2015-03-31 13F RAMBUS INC DEL COM 750917106 7,169,620 90,159
2015-02-12 2014-12-31 13F RAMBUS INC DEL COM 750917106 6,877,454 -119,073 -1.70 76,271 -12.65 0.0055
2014-11-12 2014-09-30 13F RAMBUS INC DEL COM 750917106 6,996,527 65,660 0.95 87,317 -11.90 0.0068
2014-08-11 2014-06-30 13F RAMBUS INC DEL COM 750917106 6,930,867 -167,567 -2.36 99,112 29.88 0.0078
2014-05-13 2014-03-31 13F RAMBUS INC DEL COM 750917106 7,098,434 242,501 3.54 76,309 17.53 0.0064
2014-02-12 2013-12-31 13F RAMBUS INC DEL COM 750917106 6,855,933 479,226 7.52 64,926 8.32 0.0057
2013-11-07 2013-09-30 13F RAMBUS INC DEL COM 750917106 6,376,707 292,593 4.81 59,941 14.69 0.0059
2013-08-13 2013-06-30 13F RAMBUS INC DEL COM 750917106 6,084,114 6,084,114 52,262 0.0055
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.