Rambus Inc.
US ˙ NasdaqGS ˙ US7509171069

SecurityRMBS / Rambus Inc.
InstitutionNatixis Advisors, L.p.
Latest Disclosed Ownership30,567 shares
Latest Disclosed Value $ 2,630
Natixis Advisors, L.p. reports 7.76% increase in ownership of RMBS / Rambus Inc.

On May 13, 2026 - Natixis Advisors, L.p. filed a 13F-HR form disclosing ownership of 30,567 shares of Rambus Inc. (US:RMBS) valued at $2,629,679 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 28,366 shares of Rambus Inc.. This represents a change in shares of 7.76% during the quarter. The current value of the position is $5,216,564 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)
2026-05-13 2026-03-31 13F RAMBUS INC COM 750917106 30,567 2,201 7.76 3 0.00 0.0037
2026-02-10 2025-12-31 13F RAMBUS INC COM 750917106 28,366 2,308 8.86 3 0.00 0.0037
2025-11-13 2025-09-30 13F RAMBUS INC COM 750917106 26,058 1,661 6.81 3 100.00 0.0040
2025-08-13 2025-06-30 13F RAMBUS INC COM 750917106 24,397 -98,082 -80.08 2 -83.33 0.0025
2025-05-08 2025-03-31 13F RAMBUS INC COM 750917106 122,479 -36,204 -22.82 6 -25.00 0.0117
2025-02-10 2024-12-31 13F RAMBUS INC DEL COM 750917106 158,683 -136,624 -46.27 8 -33.33 0.0157
2024-11-06 2024-09-30 13F RAMBUS INC COM 750917106 295,307 72,280 32.41 12 -7.69 0.0243
2024-08-01 2024-06-30 13F RAMBUS INC COM 750917106 223,027 14,093 6.75 13 8.33 0.0285
2024-04-25 2024-03-31 13F RAMBUS INC COM 750917106 208,934 34,875 20.04 13 9.09 0.0297
2024-02-06 2023-12-31 13F RAMBUS INC COM 750917106 174,059 -72,284 -29.34 12 -15.38 0.0313
2023-11-13 2023-09-30 13F RAMBUS COM 750917106 246,343 7,375 3.09 14 -13.33 0.0420
2023-08-15 2023-06-30 13F RAMBUS INC COM 750917106 238,968 6,608 2.84 15 36.36 0.0473
2023-05-11 2023-03-31 13F RAMBUS INC COM 750917106 232,360 -66,720 -22.31 12 10.00 0.0410
2023-01-27 2022-12-31 13F RAMBUS INC COM 750917106 299,080 158,580 112.87 11 -99.72 0.0405
2022-11-14 2022-09-30 13F RAMBUS INC DEL COM 750917106 140,500 -83,918 -37.39 3,572 -25.94 0.0151
2022-08-12 2022-06-30 13F RAMBUS INC COM 750917106 224,418 90,387 67.44 4,823 12.85 0.0212
2022-05-12 2022-03-31 13F RAMBUS COM 750917106 134,031 114,596 589.64 4,274 648.51 0.0163
2022-02-08 2021-12-31 13F RAMBUS COM 750917106 19,435 2,280 13.29 571 49.87 0.0022
2021-11-15 2021-09-30 13F RAMBUS INC DEL COM 750917106 17,155 568 3.42 381 -3.05 0.0016
2021-08-12 2021-06-30 13F RAMBUS INC DEL COM 750917106 16,587 2,747 19.85 393 46.10 0.0018
2021-05-05 2021-03-31 13F RAMBUS INC DEL COM 750917106 13,840 13,840 269 0.0014
2020-11-12 2020-09-30 13F RAMBUS INC COM 750917106 0 -189,379 -100.00 0 -100.00
2020-08-11 2020-06-30 13F RAMBUS INC COM 750917106 189,379 -398 -0.21 2,878 36.66 0.0191
2020-04-27 2020-03-31 13F RAMBUS COM 750917106 189,777 -1,949 -1.02 2,106 -20.26 0.0172
2020-02-10 2019-12-31 13F RAMBUS INC COM 750917106 191,726 6,970 3.77 2,641 8.91 0.0186
2019-11-12 2019-09-30 13F RAMBUS COM 750917106 184,756 21,606 13.24 2,425 23.47 0.0192
2019-08-12 2019-06-30 13F RAMBUS INC COM 750917106 163,150 43,770 36.66 1,964 57.50 0.0160
2019-05-15 2019-03-31 13F/A-1 RAMBUS INC COM 750917106 119,380 119,380 1,247 0.0109
2019-05-15 2019-03-31 13F RAMBUS INC COM 750917106 119,380 1,247 0.0109
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.