Notice of Proposed Sale · 144

Rambus Inc.

RMBSNASDAQEQUITYCurrent

Notice of Proposed Sale

Filed Oct 2, 2026Accepted Oct 2, 2026, 4:11 PM EDTFiling CIK 1188095Accession 0001969223-26-001057

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Structured filing — 144

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Notice of proposed sale. The proposed amounts below do not establish that a sale occurred.

Proposed-sale notice

Issuer: RAMBUS INC
Issuer CIK: 0000917273
SEC file number: 000-22339
Phone: 408-462-8000
Person for whose account securities are to be sold: KISSNER CHARLES
Relationships to issuer: Director
Street: 4453 NORTH FIRST STREET, SUITE 100
City: SAN JOSE
State / country code: CA
Postal code: 95134

Securities proposed for sale

Securities proposed for sale · 1 reported row
Security	Proposed units	Aggregate market value	Units outstanding	Approximate sale date	Exchange	Broker / market maker
Common	5,000	555,000.00	108,461,603	10/02/2026	NASDAQ	UBS Financial Services Inc.

Broker / market maker — proposed row 1, entry 1

Name: UBS Financial Services Inc.
Street: 11 Madison Avenue
Street (continued): 4th Floor
City: New York
State / country code: NY
Postal code: 10010

Acquisition of securities to be sold

Acquisition of securities to be sold · 1 reported row
Security	Acquired	Nature of acquisition	Acquired from	Amount acquired	Gift transaction	Payment date	Nature of payment
Common	10/01/2014	RSU	Issuer	5,000	N	10/01/2014	N/A

Sales reported in the preceding three months

Sales reported in the preceding three months · 2 reported rows
Seller	Security	Sale date	Amount sold	Gross proceeds
Charles Kissner	Common	08/07/2026	5,000	504,600.00
Charles Kissner	Common	09/22/2026	5,000	525,000.00

Seller — prior-sale row 1, entry 1

Name: Charles Kissner
Street: 4453 NORTH FIRST STREET
Street (continued): Suite 100
City: San Jose
State / country code: CA
Postal code: 95134

Seller — prior-sale row 2, entry 1

Name: Charles Kissner
Street: 4453 NORTH FIRST STREET
Street (continued): Suite 100
City: San Jose
State / country code: CA
Postal code: 95134

Prior-sale reporting

Nothing to report for the preceding three months: N

Remarks

The shares covered by this filing are being sold by Kissner & Associates, LLC

Notice signature

Notice date: 10/02/2026
Signed: /s/ UBS Financial Services Inc, as attorney-in-fact for Charles Kissner
Plan adoption dates: 05/08/2026

Company context

Rambus delivers industry-leading chips and silicon IP for the data center and AI infrastructure. With over three decades of advanced semiconductor experience, our products and technologies address the critical bottlenecks between memory and processing to accelerate data-intensive workloads. By enabling greater bandwidth, efficiency and security across next generation computing platforms, we make data faster and safer. For more information, visit rambus.com.

Current securities

RMBSNASDAQ · EQUITY · Current

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