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                    <ccc>XXXXXXXX</ccc>
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            <liveTestFlag>LIVE</liveTestFlag>



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        <issuerInfo>
            <issuerCik>0000917273</issuerCik>
            <issuerName>RAMBUS INC.</issuerName>
            <secFileNumber>000-22339</secFileNumber>
            <issuerAddress>
                <ns2:street1>4453 North First Street</ns2:street1>
                <ns2:street2>Suite 100</ns2:street2>
                <ns2:city>San Jose</ns2:city>
                <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                <ns2:zipCode>95134</ns2:zipCode>
            </issuerAddress>
            <issuerContactPhone>(408) 462-8000</issuerContactPhone>
            <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>LUC SERAPHIN</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <relationshipsToIssuer>
                <relationshipToIssuer>Officer</relationshipToIssuer>
                <relationshipToIssuer>Director</relationshipToIssuer>
            </relationshipsToIssuer>
        </issuerInfo>
        <securitiesInformation>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <brokerOrMarketmakerDetails>
                <name>Morgan Stanley Smith Barney LLC Executive Financial Services</name>
                <address>
                    <ns2:street1>1 New York Plaza</ns2:street1>
                    <ns2:street2>8th Floor</ns2:street2>
                    <ns2:city>New York</ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10004</ns2:zipCode>
                </address>
            </brokerOrMarketmakerDetails>
            <noOfUnitsSold>6348</noOfUnitsSold>
            <aggregateMarketValue>298165.56</aggregateMarketValue>
            <noOfUnitsOutstanding>107445874</noOfUnitsOutstanding>
            <approxSaleDate>04/23/2025</approxSaleDate>
            <securitiesExchangeName>NASDAQ</securitiesExchangeName>
        </securitiesInformation>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>02/01/2025</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>ISSUER</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>4109</amountOfSecuritiesAcquired>
            <paymentDate>02/01/2025</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>04/01/2025</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>ISSUER</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>2239</amountOfSecuritiesAcquired>
            <paymentDate>04/01/2025</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>LUC SERAPHIN</name>
                <address>
                    <ns2:street1>4453 North First Street</ns2:street1>
                    <ns2:street2>Suite 100</ns2:street2>
                    <ns2:city>San Jose</ns2:city>
                    <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                    <ns2:zipCode>95134</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>04/22/2025</saleDate>
            <amountOfSecuritiesSold>1255</amountOfSecuritiesSold>
            <grossProceeds>56475.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>LUC SERAPHIN</name>
                <address>
                    <ns2:street1>4453 North First Street</ns2:street1>
                    <ns2:street2>Suite 100</ns2:street2>
                    <ns2:city>San Jose</ns2:city>
                    <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                    <ns2:zipCode>95134</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>04/15/2025</saleDate>
            <amountOfSecuritiesSold>4487</amountOfSecuritiesSold>
            <grossProceeds>214419.37</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>LUC SERAPHIN</name>
                <address>
                    <ns2:street1>4453 North First Street</ns2:street1>
                    <ns2:street2>Suite 100</ns2:street2>
                    <ns2:city>San Jose</ns2:city>
                    <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                    <ns2:zipCode>95134</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>04/15/2025</saleDate>
            <amountOfSecuritiesSold>5513</amountOfSecuritiesSold>
            <grossProceeds>263448.63</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>LUC SERAPHIN</name>
                <address>
                    <ns2:street1>4453 North First Street</ns2:street1>
                    <ns2:street2>Suite 100</ns2:street2>
                    <ns2:city>San Jose</ns2:city>
                    <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                    <ns2:zipCode>95134</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>04/08/2025</saleDate>
            <amountOfSecuritiesSold>10000</amountOfSecuritiesSold>
            <grossProceeds>468100.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>LUC SERAPHIN</name>
                <address>
                    <ns2:street1>4453 North First Street</ns2:street1>
                    <ns2:street2>Suite 100</ns2:street2>
                    <ns2:city>San Jose</ns2:city>
                    <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                    <ns2:zipCode>95134</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>04/01/2025</saleDate>
            <amountOfSecuritiesSold>10000</amountOfSecuritiesSold>
            <grossProceeds>508815.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>LUC SERAPHIN</name>
                <address>
                    <ns2:street1>4453 North First Street</ns2:street1>
                    <ns2:street2>Suite 100</ns2:street2>
                    <ns2:city>San Jose</ns2:city>
                    <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                    <ns2:zipCode>95134</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>03/25/2025</saleDate>
            <amountOfSecuritiesSold>10000</amountOfSecuritiesSold>
            <grossProceeds>586406.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>LUC SERAPHIN</name>
                <address>
                    <ns2:street1>4453 North First Street</ns2:street1>
                    <ns2:street2>Suite 100</ns2:street2>
                    <ns2:city>San Jose</ns2:city>
                    <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                    <ns2:zipCode>95134</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>03/18/2025</saleDate>
            <amountOfSecuritiesSold>10000</amountOfSecuritiesSold>
            <grossProceeds>537888.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <noticeSignature>
            <noticeDate>04/23/2025</noticeDate>
            <planAdoptionDates>
                <planAdoptionDate>12/13/2024</planAdoptionDate>
            </planAdoptionDates>
            <signature>/s/ Luc Seraphin</signature>
        </noticeSignature>
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144
0001341984
XXXXXXXX
LIVE
0000917273
RAMBUS INC.
000-22339
4453 North First Street
Suite 100
San Jose
CA
95134
(408) 462-8000
LUC SERAPHIN
Officer
Director
Common
Morgan Stanley Smith Barney LLC Executive Financial Services
1 New York Plaza
8th Floor
New York
NY
10004
6348
298165.56
107445874
04/23/2025
NASDAQ
Common
02/01/2025
Restricted Stock
ISSUER
N
4109
02/01/2025
Not Applicable
Common
04/01/2025
Restricted Stock
ISSUER
N
2239
04/01/2025
Not Applicable
N
LUC SERAPHIN
4453 North First Street
Suite 100
San Jose
CA
95134
Common
04/22/2025
1255
56475.00
LUC SERAPHIN
4453 North First Street
Suite 100
San Jose
CA
95134
Common
04/15/2025
4487
214419.37
LUC SERAPHIN
4453 North First Street
Suite 100
San Jose
CA
95134
Common
04/15/2025
5513
263448.63
LUC SERAPHIN
4453 North First Street
Suite 100
San Jose
CA
95134
Common
04/08/2025
10000
468100.00
LUC SERAPHIN
4453 North First Street
Suite 100
San Jose
CA
95134
Common
04/01/2025
10000
508815.00
LUC SERAPHIN
4453 North First Street
Suite 100
San Jose
CA
95134
Common
03/25/2025
10000
586406.00
LUC SERAPHIN
4453 North First Street
Suite 100
San Jose
CA
95134
Common
03/18/2025
10000
537888.00
04/23/2025
12/13/2024
/s/ Luc Seraphin