Luc Seraphin - 01 Feb 2026 Form 4 Insider Report for RAMBUS INC (RMBS)

Role: President and CEO, Director
Signature: /s/ Brian Wu, by power of attorney
Issuer symbol: RMBS
Transactions as of: 01 Feb 2026
Net transactions value: -$10,520,790
Form type: 4
Filing time: 03 Feb 2026, 20:20:51 UTC
Previous filing: 24 Apr 2025
Next filing: 03 Mar 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Seraphin Luc	President and CEO, Director	C/O RAMBUS INC., 4453 NORTH FIRST STREET, SUITE 100, SAN JOSE	/s/ Brian Wu, by power of attorney	03 Feb 2026	0001341984

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	RMBS	Common Stock	Award	$0	+143,744	+45%	$0.000000	463,507	01 Feb 2026	Direct	F1, F2
transaction	RMBS	Common Stock	Tax liability	$10,520,790	-92,523	-20%	$113.71	370,984	01 Feb 2026	Direct	F3

* 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	Includes an exempt transaction of 522 shares acquired through the Rambus Inc. 2015 Employee Stock Purchase Plan.
F3	The shares were withheld to cover the Reporting Person's tax liability in connection with the vesting of restricted stock units, or RSUs.