Rambus: BlackRock reports 12.2% ownership stake

BlackRock, Inc. reports beneficial ownership of 13,203,935 shares of Rambus Inc. common stock, representing 12.2% of the class.

Rhea-AI Filing Summary

BlackRock, Inc. reports beneficial ownership of 13,203,935 shares of Rambus Inc. common stock, representing 12.2% of the class. BlackRock has sole voting power over 12,911,062 shares and sole dispositive power over 13,203,935 shares, with no shared voting or dispositive power.

Various underlying persons have rights to receive dividends or sale proceeds from these shares, but no single such person holds an interest in more than five percent of Rambus’s outstanding common stock. The filing is made by BlackRock on behalf of certain of its business units.

Key Figures

Beneficial ownership: 13,203,935 shares Percent of class: 12.2% Sole voting power: 12,911,062 shares +3 more

6 metrics

Beneficial ownership 13,203,935 shares Shares of Rambus common stock beneficially owned by BlackRock

Percent of class 12.2% Portion of Rambus common stock class beneficially owned

Sole voting power 12,911,062 shares Shares over which BlackRock has sole power to vote

Shared voting power 0 shares Shares over which BlackRock has shared power to vote

Sole dispositive power 13,203,935 shares Shares over which BlackRock has sole power to dispose

Shared dispositive power 0 shares Shares over which BlackRock has shared power to dispose

Key Terms

beneficially owned, sole voting power, sole dispositive power, Schedule 13G, +1 more

5 terms

beneficially owned financial

"reflects the securities beneficially owned, or deemed to be beneficially owned, by certain business units"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

sole voting power financial

"Sole power to vote or to direct the vote: 12911062"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

sole dispositive power financial

"Sole power to dispose or to direct the disposition of: 13203935"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

Schedule 13G regulatory

"In accordance with SEC Release No. 34-39538 this Schedule 13G reflects the securities"

A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.

parent holding company financial

"Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company"

FAQ

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

What percentage of Rambus Inc. (RMBS) does BlackRock currently report owning?

BlackRock reports beneficial ownership of 12.2% of Rambus Inc.’s common stock. This stake corresponds to 13,203,935 shares as disclosed in the Schedule 13G/A, giving BlackRock a significant institutional position in the company.

How many Rambus (RMBS) shares does BlackRock have voting power over?

BlackRock has sole voting power over 12,911,062 shares of Rambus common stock. It reports no shared voting power, meaning all reported voting authority is held on a sole basis by BlackRock’s reporting business units.

What is the total number of Rambus (RMBS) shares BlackRock beneficially owns?

BlackRock beneficially owns 13,203,935 Rambus common shares. It also reports sole dispositive power over the same 13,203,935 shares, with no shared dispositive power, according to the Schedule 13G/A amendment.

Do any BlackRock clients hold more than 5% of Rambus (RMBS) through this stake?

No, the filing states that no one person has an interest in more than five percent of Rambus’s outstanding common shares. Various persons may receive dividends or sale proceeds, but none exceed the 5% threshold.

Who signed the Schedule 13G/A reporting BlackRock’s Rambus (RMBS) holdings?

The Schedule 13G/A was signed by Spencer Fleming, a Managing Director at BlackRock. The signature is supported by a Power of Attorney included as Exhibit 24 to the filing.

What type of securities in Rambus (RMBS) are covered by BlackRock’s 13G/A filing?

The filing covers common stock of Rambus Inc. It identifies the security under the title of class of securities as common stock and references the CUSIP number 750917106 for these shares.

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

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Available on EDGAR 07/29/2026 - 03:22 PM Accepted by SEC EDGAR 07/29/2026 - 03:19 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 6)

RAMBUS INC

(Name of Issuer)

Common Stock

(Title of Class of Securities)

750917106

(CUSIP Number)

06/30/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 750917106

1

Names of Reporting Persons

BlackRock, Inc.

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 12,911,062.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 13,203,935.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

13,203,935.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

12.2 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

Item 1.
(a)	Name of issuer: RAMBUS INC
(b)	Address of issuer's principal executive offices: 4453 NORTH FIRST STREET, SUITE 100 SAN JOSE CA 95134
Item 2.
(a)	Name of person filing: BlackRock, Inc. In accordance with SEC Release No. 34-39538 (January 12, 1998), this Schedule 13G reflects the securities beneficially owned, or deemed to be beneficially owned, by certain business units (collectively, the "Reporting Business Units") of BlackRock, Inc. and its subsidiaries and affiliates. It does not include securities, if any, beneficially owned by other business units whose beneficial ownership of securities are disaggregated from that of the Reporting Business Units in accordance with such release.
(b)	Address or principal business office or, if none, residence: BlackRock, Inc., 50 Hudson Yards New York, NY 10001
(c)	Citizenship: See Item 4 of Cover Page
(d)	Title of class of securities: Common Stock
(e)	CUSIP No.: 750917106
Item 4.	Ownership
(a)	Amount beneficially owned: 13203935
(b)	Percent of class: 12.2 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 12911062
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 13203935
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. Various persons have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of the common stock of RAMBUS INC. No one person's interest in the common stock of RAMBUS INC is more than five percent of the total outstanding common shares.
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary. See Exhibit 99
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

BlackRock, Inc.

Signature:	Spencer Fleming
Name/Title:	Managing Director
Date:	07/29/2026

Exhibit Information

Exhibit 24: Power of Attorney Exhibit 99: Item 7