[Form 4] Rambus Inc Insider Trading Activity

Rhea-AI Filing Summary

SEC Form 4 filed on 8 Aug 2025 reports that Rambus (RMBS) director Emiko Higashi sold 1,111 common shares on 4 Aug 2025 at an exact price of $75.00, generating proceeds of about $83k. Following the sale, Higashi’s direct holdings stand at 63,371 shares. No derivative securities were involved and the transaction was not executed under a disclosed 10b5-1 trading plan. The filing was submitted by attorney-in-fact Brian Wu on 6 Aug 2025.

The disposition represents roughly 1.7% of the insider’s reported stake and is immaterial relative to Rambus’s total outstanding shares, suggesting the action is routine portfolio management rather than a signal of strategic change. Investors monitoring insider sentiment may note that Higashi retains a sizeable position, maintaining alignment with shareholders.

Insights

Equity Analyst

TL;DR: Minor insider sale; 1,111 RMBS shares sold at $75—negligible dilution, neutral signal.

The transaction equals ~1.7% of Higashi’s holdings and an even smaller fraction of Rambus’s 100 m+ share base, so market impact should be minimal. No option exercise or 10b5-1 plan is cited, but the modest dollar value (~$83k) and continued 63k-share stake reduce concern over insider confidence. I classify the filing as neutral and not impactful for valuation or sentiment.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Higashi Emiko

(Last) (First) (Middle)

C/O RAMBUS INC

4453 NORTH FIRST ST, SUITE 100

(Street)

SAN JOSE CA 95134

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
RAMBUS INC [ RMBS ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
08/04/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	08/04/2025		S		1,111	D	$75(1)	63,371	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. All shares sold at an exact price of $75.000000

	/s/Brian Wu, by power of attorney	08/06/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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FAQ

How many Rambus (RMBS) shares did director Emiko Higashi sell?

Higashi disposed of 1,111 common shares.

What was the sale price in the Form 4 filing?

All shares were sold at an exact price of $75.00.

When did the insider transaction occur?

The sale took place on August 4, 2025.

How many RMBS shares does Emiko Higashi still own after the sale?

The director now holds 63,371 shares directly.

Was the transaction executed under a Rule 10b5-1 plan?

No 10b5-1 trading plan was indicated in the filing.