Rambus CAO reports 8,293 RSU-based shares

Rambus Inc disclosed that its Chief Accounting Officer holds 8,293 RSU-based common shares vesting annually starting in 2027.

Available on EDGAR 09/15/2026 - 06:37 PM EDT Accepted by SEC EDGAR 09/15/2026 - 06:36 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

RAMBUS INC (RMBS) reported the initial equity holdings of Chief Accounting Officer William Clarence Taulbee II on a Form 3. He holds 8,293 shares of common stock, represented by restricted stock units (RSUs) that vest in four equal annual installments beginning on September 1, 2027, with each RSU delivering one share of RMBS common stock upon vesting.

Insider Trade Summary

Holdings reported, no transactions

Holdings

Insider Taulbee William Clarence II

Role Chief Accounting Officer

Type	Security	Shares	Price	Value
Holding	Common Stock F1	--	--	--

Holdings: Common Stock — 8,293 shares (Direct)

Footnotes (1)

1. F1. The shares are represented by RSUs which vest in four equal annual installments beginning on September 1, 2027 or the first business trading day thereafter. Each RSU represents a contingent right to receive one share of RMBS common stock.

Key Figures

RSU-based common shares held: 8,293 shares Vesting installments: 4 annual installments Vesting start date: September 1, 2027 +1 more

4 metrics

RSU-based common shares held 8,293 shares Total direct holdings of common stock represented by RSUs after the reported position

Vesting installments 4 annual installments RSUs vest in four equal annual installments

Vesting start date September 1, 2027 First vesting date or the first business trading day thereafter

RSU-to-share ratio 1 RSU : 1 share Each RSU represents a contingent right to receive one share of RMBS common stock

Key Terms

RSUs, vest, contingent right

3 terms

RSUs financial

"The shares are represented by RSUs which vest in four equal annual installments"

RSUs, or restricted stock units, are a form of company shares given to employees as part of their compensation. They are typically awarded with certain restrictions, such as a waiting period before they can be fully owned or sold, similar to earning a gift that becomes fully yours over time. For investors, RSUs can impact a company's stock offerings and reflect how much the company relies on stock-based incentives to attract and retain talent.

vest financial

"RSUs which vest in four equal annual installments beginning on September 1, 2027"

A vest is the process by which an employee earns the right to receive certain benefits or ownership interests, such as stock or retirement funds, over time. It’s similar to earning a reward gradually, ensuring that the benefit becomes fully yours only after a set period or meeting specific conditions. This makes it important for investors because it determines when they can actually claim or use those benefits.

contingent right financial

"Each RSU represents a contingent right to receive one share of RMBS common stock"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did RMBS disclose in this Form 3 for William Clarence Taulbee II?

RMBS disclosed that Chief Accounting Officer William Clarence Taulbee II has 8,293 shares of common stock represented by RSUs, vesting in four equal annual installments starting on September 1, 2027, with each RSU converting into one share of RMBS common stock.

How many RMBS shares does the Chief Accounting Officer beneficially hold?

The Chief Accounting Officer beneficially holds 8,293 shares of RMBS common stock, represented by restricted stock units. This figure is reported as the total direct holdings following the reported position on the Form 3.

When do the RMBS RSUs for the Chief Accounting Officer begin vesting?

The RSUs begin vesting on September 1, 2027, or the first business trading day thereafter. Vesting then continues in four equal annual installments according to the disclosure.

What does each RSU reported by RMBS for the CAO represent?

Each RSU represents a contingent right to receive one share of RMBS common stock. The shares are delivered as the RSUs vest over the four-year schedule beginning in 2027.

Does this RMBS Form 3 report any insider buying or selling activity?

No. The Form 3 reports a holding of 8,293 RSU-based shares and provides their vesting schedule; it does not report any purchase or sale transactions.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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SEC Form 3

FORM 3

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

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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:			3235-0104
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

Taulbee William Clarence II

(Last) (First) (Middle)

4453 N FIRST ST

SUITE 100

(Street)

SAN JOSE CALIFORNIA 95134

(City) (State) (Zip)

UNITED STATES

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
09/08/2026

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

3a. Foreign Trading Symbol

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

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

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

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 Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	8,293(1)	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. The shares are represented by RSUs which vest in four equal annual installments beginning on September 1, 2027 or the first business trading day thereafter. Each RSU represents a contingent right to receive one share of RMBS common stock.

	/s/Brian Wu, by power of attorney	09/15/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 3: SEC 1473 (03-26)