Rambus Inc.
US ˙ NasdaqGS ˙ US7509171069

SecurityRMBS / Rambus Inc.
InstitutionDeutsche Bank Ag\
Latest Disclosed Ownership108,308 shares
Latest Disclosed Value $ 9,317,738
Deutsche Bank Ag\ ownership in RMBS / Rambus Inc.

On May 6, 2026 - Deutsche Bank Ag\ filed a 13F-HR form disclosing ownership of 108,308 shares of Rambus Inc. (US:RMBS) valued at $9,317,737 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 97,196 shares of Rambus Inc.. This represents a change in shares of 11.43% during the quarter. The current value of the position is $15,738,235 USD.

Deutsche Bank Ag\ has a history of taking positions in derivatives of the underlying security (RMBS) in the form of stock options. The firm currently holds call options representing 0 of underlying shares valued at $0 USD and put options representing 0 of underlying shares valued at $0 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

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 .

Institutional Put/Call Ratios
(Premium Subscription Required)

In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

RMBS / Rambus Inc. Historical Put/Call Ratio
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)
2026-05-06 2026-03-31 13F RAMBUS INC DEL COM 750917106 108,308 11,112 11.43 9,318 4.32 0.0031
2026-02-11 2025-12-31 13F RAMBUS INC DEL COM 750917106 97,196 -28,748 -22.83 8,931 -31.94 0.0029
2025-11-13 2025-09-30 13F RAMBUS INC DEL COM 750917106 125,944 -1,862 -1.46 13,123 60.39 0.0044
2025-08-12 2025-06-30 13F RAMBUS INC DEL COM 750917106 127,806 -65,020 -33.72 8,182 -18.05 0.0030
2025-05-09 2025-03-31 13F RAMBUS INC DEL COM 750917106 192,826 53,824 38.72 9,985 35.89 0.0040
2025-06-30 2024-12-31 13F/A-1 RAMBUS INC DEL COM 750917106 139,002 39,798 40.12 7,348 75.43 0.0029
2025-02-14 2024-12-31 13F RAMBUS INC DEL COM 750917106 139,002 39,798 7,348 0.0029
2025-06-26 2024-09-30 13F/A-1 RAMBUS INC DEL COM 750917106 99,204 37,632 61.12 4,188 15.79 0.0017
2024-11-13 2024-09-30 13F RAMBUS INC DEL COM 750917106 99,204 37,632 4,188 0.0017
2025-06-12 2024-06-30 13F/A-1 RAMBUS INC DEL COM 750917106 61,572 -42,847 -41.03 3,618 -43.96 0.0016
2024-08-14 2024-06-30 13F RAMBUS INC DEL COM 750917106 61,572 -42,847 3,618 0.0016
2025-06-02 2024-03-31 13F/A-1 RAMBUS INC DEL COM 750917106 104,419 38,414 58.20 6,454 43.29 0.0030
2024-05-15 2024-03-31 13F RAMBUS INC DEL COM 750917106 104,419 38,414 6,454 0.0030
2024-02-14 2023-12-31 13F RAMBUS INC DEL COM 750917106 66,005 -3,571 -5.13 4,505 16.05 0.0023
2023-11-24 2023-09-30 13F/A-1 RAMBUS INC DEL COM 750917106 69,576 8,037 13.06 3,882 -1.70 0.0025
2023-11-09 2023-09-30 13F RAMBUS INC DEL COM 750917106 69,576 8,037 3,882 0.0021
2023-08-14 2023-06-30 13F RAMBUS INC DEL COM 750917106 61,539 -21,568 -25.95 3,949 -7.32 0.0021
2023-05-15 2023-03-31 13F RAMBUS INC DEL COM 750917106 83,107 10,767 14.88 4,260 64.42 0.0024
2023-02-13 2022-12-31 13F RAMBUS INC DEL COM 750917106 72,340 -17,056 -19.08 2,591 14.04 0.0015
2022-11-14 2022-09-30 13F RAMBUS INC DEL COM 750917106 89,396 -146,597 -62.12 2,272 -55.21 0.0014
2022-08-11 2022-06-30 13F RAMBUS INC DEL COM 750917106 235,993 -223,461 -48.64 5,072 -65.38 0.0028
2022-05-13 2022-03-31 13F RAMBUS INC DEL COM 750917106 459,454 -200,169 -30.35 14,651 -24.43 0.0068
2022-02-16 2021-12-31 13F/A-1 RAMBUS INC DEL COM 750917106 659,623 336,380 104.06 19,387 170.16 0.0087
2022-02-11 2021-12-31 13F RAMBUS INC DEL COM 750917106 659,623 336,380 19,387 0.0010
2021-11-04 2021-09-30 13F RAMBUS INC DEL COM 750917106 323,243 202,910 168.62 7,176 151.44 0.0034
2021-08-11 2021-06-30 13F RAMBUS INC DEL COM 750917106 120,333 -52,342 -30.31 2,854 -14.98 0.0014
2021-05-13 2021-03-31 13F RAMBUS INC DEL COM 750917106 172,675 72,809 72.91 3,357 92.38 0.0018
2021-02-16 2020-12-31 13F RAMBUS INC DEL COM 750917106 99,866 -291,582 -74.49 1,745 -67.44 0.0011
2020-11-12 2020-09-30 13F RAMBUS INC DEL COM 750917106 391,448 -7,899 -1.98 5,359 -11.71 0.0037
2020-08-13 2020-06-30 13F RAMBUS INC DEL COM 750917106 399,347 -428,751 -51.78 6,070 -33.96 0.0046
2020-05-14 2020-03-31 13F RAMBUS INC DEL COM 750917106 828,098 13,761 1.69 9,192 -18.05 0.0082
2020-02-14 2019-12-31 13F RAMBUS INC DEL COM 750917106 814,337 403,694 98.31 11,216 108.20 0.0073
2019-11-14 2019-09-30 13F RAMBUS INC DEL COM 750917106 410,643 -124,799 -23.31 5,387 -16.40 0.0037
2019-08-14 2019-06-30 13F RAMBUS INC DEL COM 750917106 535,442 -705,256 -56.84 6,444 -50.29 0.0038
2019-05-15 2019-03-31 13F RAMBUS INC DEL COM 750917106 1,240,698 -26,262 -2.07 12,963 33.42 0.0077
2019-04-01 2018-12-31 13F/A-1 RAMBUS INC DEL COM 750917106 1,266,960 -417,253 -24.77 9,716 -47.12 0.0069
2019-02-14 2018-12-31 13F RAMBUS INC DEL COM 750917106 1,266,960 113,045 9,716
2021-12-21 2018-09-30 13F/A-1 RAMBUS INC DEL COM 750917106 1,684,213 -95,053 -5.34 18,374 -17.65 0.0093
2018-11-14 2018-09-30 13F RAMBUS INC DEL COM 750917106 1,153,915 -625,351 12,587 0.0087
2020-04-21 2018-06-30 13F/A-1 RAMBUS INC DEL COM 750917106 1,779,266 266,059 17.58 22,312 9.80 0.0111
2018-08-14 2018-06-30 13F RAMBUS INC DEL COM 750917106 1,190,579 -322,628 14,927 9,914.4762
2019-10-23 2018-03-31 13F/A-2 RAMBUS INC DEL COM 750917106 1,513,207 250,590 19.85 20,320 13.20 0.0097
2019-10-18 2018-03-31 13F/A-1 RAMBUS INC DEL COM 750917106 1,513,207 0 20,320 0.0097
2018-05-15 2018-03-31 13F RAMBUS INC DEL COM 750917106 1,250,665 -11,952 16,794
2018-02-14 2017-12-31 13F RAMBUS INC DEL COM 750917106 1,262,617 640,127 102.83 17,951 116.04 0.0115
2017-11-14 2017-09-30 13F RAMBUS INC DEL COM 750917106 622,490 39,691 6.81 8,309 24.78 0.0057
2017-08-11 2017-06-30 13F RAMBUS INC DEL COM 750917106 582,799 525,162 911.15 6,659 780.82 0.0048
2017-05-15 2017-03-31 13F RAMBUS INC DEL COM 750917106 57,637 -66,076 -53.41 756 -55.56 0.0006
2017-02-14 2016-12-31 13F RAMBUS INC DEL COM 750917106 123,713 -71,817 -36.73 1,701 -30.34 0.0014
2016-11-14 2016-09-30 13F RAMBUS INC DEL COM 750917106 195,530 -11,926 -5.75 2,442 -2.44 0.0017
2016-08-15 2016-06-30 13F RAMBUS INC DEL COM 750917106 207,456 -86,731 -29.48 2,503 -38.09 0.0018
2016-05-16 2016-03-31 13F RAMBUS INC DEL COM 750917106 294,187 -57,442 -16.34 4,043 -0.76 0.0030
2016-02-16 2015-12-31 13F RAMBUS INC DEL COM 750917106 351,629 109,654 45.32 4,074 42.75 0.0028
2015-11-17 2015-09-30 13F RAMBUS INC DEL COM 750917106 241,975 -150,424 -38.33 2,854 -49.79 0.0022
2015-08-12 2015-06-30 13F RAMBUS INC DEL COM 750917106 392,399 -198,540 -33.60 5,684 -23.49 0.0036
2015-05-15 2015-03-31 13F RAMBUS INC DEL COM 750917106 590,939 -138,035 -18.94 7,429 -8.08 0.0046
2015-02-13 2014-12-31 13F RAMBUS INC DEL COM 750917106 728,974 18,858 2.66 8,082 -8.79 0.0050
2014-11-14 2014-09-30 13F RAMBUS INC DEL COM 750917106 710,116 219,519 44.75 8,861 26.33 0.0055
2014-08-15 2014-06-30 13F RAMBUS INC DEL COM 750917106 490,597 -43,513 -8.15 7,014 22.17 0.0048
2014-05-15 2014-03-31 13F RAMBUS INC DEL COM 750917106 534,110 30,033 5.96 5,741 20.28 0.0041
2014-02-24 2013-12-31 13F/A-1 RAMBUS INC DEL COM 750917106 504,077 321,791 176.53 4,773 178.96 0.0034
2014-02-18 2013-12-31 13F RAMBUS INC DEL COM 750917106 504,077 4,773
2013-11-18 2013-09-30 13F RAMBUS INC DEL COM 750917106 182,286 65,677 56.32 1,711 70.93 0.0013
2013-08-16 2013-06-30 13F RAMBUS INC DEL COM 075091710 116,609 116,609 1,001 0.0008
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2023-08-14 2023-06-30 13F RAMBUS INC DEL COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2023-05-15 2023-03-31 13F RAMBUS INC DEL COM Call 700 36 n/a n/a n/a
2022-08-11 2022-06-30 13F RAMBUS INC DEL COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2022-05-13 2022-03-31 13F RAMBUS INC DEL COM Call 40 1 n/a n/a n/a
2021-02-16 2020-12-31 13F RAMBUS INC DEL COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2020-11-12 2020-09-30 13F RAMBUS INC DEL COM Call 378 5 n/a n/a n/a
2019-05-15 2019-03-31 13F RAMBUS INC DEL COM Call 0 -100.00 0 n/a n/a n/a
2019-04-01 2018-12-31 13F/A RAMBUS INC DEL COM Call 50 0.00 0 -100.00 n/a n/a n/a
2019-02-14 2018-12-31 13F RAMBUS INC DEL COM Call 50 0 n/a n/a n/a
2021-12-21 2018-09-30 13F/A RAMBUS INC DEL COM Call 50 0.00 1 0.00 n/a n/a n/a
2018-11-14 2018-09-30 13F RAMBUS INC DEL COM Call 50 0 n/a n/a n/a
2020-04-21 2018-06-30 13F/A RAMBUS INC DEL COM Call 50 0.00 1 n/a n/a n/a
2018-08-14 2018-06-30 13F RAMBUS INC DEL COM Call 50 0 n/a n/a n/a
2019-10-18 2018-03-31 13F/A RAMBUS INC DEL COM Call 50 0 n/a n/a n/a
2019-10-23 2018-03-31 13F/A RAMBUS INC DEL COM Call 50 0.00 0 n/a n/a n/a
2018-05-15 2018-03-31 13F RAMBUS INC DEL COM Call 50 0 n/a n/a n/a
2018-02-14 2017-12-31 13F RAMBUS INC DEL COM Call 50 0 n/a n/a n/a
Disclosed Put Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share Price Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2022-08-11 2022-06-30 13F RAMBUS INC DEL COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2022-05-13 2022-03-31 13F RAMBUS INC DEL COM Put 3,401 -2.10 108 5.88 n/a n/a n/a
2022-02-16 2021-12-31 13F/A RAMBUS INC DEL COM Put 3,474 -0.06 102 32.47 n/a n/a n/a
2022-02-11 2021-12-31 13F RAMBUS INC DEL COM Put 3,474 102 n/a n/a n/a
2021-11-04 2021-09-30 13F RAMBUS INC DEL COM Put 3,476 77 n/a n/a n/a
2021-05-13 2021-03-31 13F RAMBUS INC DEL COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2021-02-16 2020-12-31 13F RAMBUS INC DEL COM Put 1,770 31 n/a n/a n/a
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.