Xianzhi Sean Fan - 01 Feb 2026 Form 4 Insider Report for RAMBUS INC (RMBS)

Role: EVP, COO
Signature: /s/ Brian Wu, by power of attorney
Issuer symbol: RMBS
Transactions as of: 01 Feb 2026
Net transactions value: -$10,507,145
Form type: 4
Filing time: 03 Feb 2026, 20:13:27 UTC
Previous filing: 21 Nov 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
FAN XIANZHI SEAN	EVP, COO	C/O RAMBUS, INC., 4453 NORTH FIRST STREET, SUITE 100, SAN JOSE	/s/ Brian Wu, by power of attorney	03 Feb 2026	0001583840

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	RMBS	Common Stock	Award	$0	+148,802	+108%	$0.000000	286,357	01 Feb 2026	Direct	F1
transaction	RMBS	Common Stock	Tax liability	$10,507,145	-92,403	-32%	$113.71	193,954	01 Feb 2026	Direct	F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	The shares are represented by performance restricted stock units, or PRSUs, all of which vest on February 1, 2026 based upon assessed achievement of the Company's performance metrics and continued service to the Company through the vesting date. Each PRSU represents a contingent right to receive one share of RMBS common stock.
F2	The shares were withheld to cover the Reporting Person's tax liability in connection with the vesting of restricted stock units, or RSUs.