FMR LLC reports 11.30M-share stake in RAMBUS (NASDAQ: RMBS) via Schedule 13G

Rhea-AI Filing Summary

RAMBUS INC ownership filing by FMR LLC reports beneficial ownership of 11,296,794.81 shares of Common Stock, representing 10.4% of the class as disclosed with CUSIP 750917106 and dated 05/29/2026. The filing shows sole dispositive power of 11,296,794.81 shares and sole voting power of 10,756,318 shares.

The schedule notes that other persons may have rights to dividends or sale proceeds but none exceeds 5.0%. Transactions were reported on behalf of FMR LLC and Abigail P. Johnson via powers of attorney; an Exhibit 99 13d-1(k)(1) agreement is referenced.

Insights

Institutional Ownership Analyst

Large passive holding disclosed: FMR LLC reports a 10.4% stake in RAMBUS.

FMR LLC reports 11,296,794.81 shares beneficially owned (10.4%) with sole dispositive power of the same amount and sole voting power of 10,756,318 shares as shown in the filing dated 05/29/2026. The filing is a Schedule 13G-style disclosure indicating an ownership stake rather than an active change-in-control transaction.

Cash-flow treatment or planned dispositions are not stated in the excerpt. Subsequent filings or the referenced Exhibit 99 may clarify any arrangements under the 13d-1(k)(1) agreement.

Governance & Compliance Specialist

Filing cites delegated signing authority and an attached 13d-1(k)(1) agreement.

The signature block shows transactions reported through powers of attorney for FMR LLC and Abigail P. Johnson, and the filing references an Exhibit 99 implementing a 13d-1(k)(1) agreement. This identifies the filing as coordinated institutional disclosure under Schedule 13G procedures.

For governance implications, the filing lists voting and dispositive counts explicitly; any change to voting control or additional agreements would appear in later amendments or exhibits.

Key Figures

CUSIP: 750917106 Beneficial ownership: 11,296,794.81 shares Percent of class: 10.4% +2 more

5 metrics

CUSIP 750917106 identifier for the reported Common Stock class

Beneficial ownership 11,296,794.81 shares <date>05/29/2026</date> reported on Schedule 13G

Percent of class <percent>10.4%</percent> Percent of Common Stock class reported

Sole voting power 10,756,318 shares Sole voting power reported on the cover page

Sole dispositive power 11,296,794.81 shares Sole dispositive power reported on the cover page

Key Terms

Schedule 13G, Beneficially owned, Dispositive power, 13d-1(k)(1) agreement

4 terms

Schedule 13G regulatory

"Item 1. (a) Name of issuer: RAMBUS INC"

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.

Beneficially owned financial

"Item 4. (a) Amount beneficially owned: 11296794.81"

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.

Dispositive power regulatory

"Item 4. (iii) Sole power to dispose: 11296794.81"

Dispositive power is the authority to decide the final outcome of an asset, legal claim, contract, or corporate action — in effect the power to dispose of or resolve something. For investors it matters because whoever holds that authority can determine who gets paid, who controls an asset or vote, and how risks and returns are allocated; think of it like holding the key that lets you lock in the winner or loser in a deal.

13d-1(k)(1) agreement regulatory

"Exhibit Information Please see Exhibit 99 for 13d-1(k)(1) agreement."

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

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FAQ

What stake does FMR LLC report in RAMBUS (RMBS)?

FMR LLC reports beneficial ownership of 11,296,794.81 shares, representing 10.4%. The Schedule 13G lists CUSIP 750917106 and indicates sole dispositive power over 11,296,794.81 shares and sole voting power of 10,756,318 shares as disclosed on 05/29/2026.

Does the filing state who controls voting and disposition for these RAMBUS shares?

The filing shows FMR LLC has sole dispositive power for 11,296,794.81 shares and sole voting power for 10,756,318 shares. It also notes Abigail P. Johnson has sole dispositive power reported via the filing, with signatures made under powers of attorney dated in 2023.

Are there other parties with rights to RAMBUS dividends or sale proceeds?

The filing states one or more other persons are known to have rights to dividends or sale proceeds, but no single other person's interest exceeds 5.0%. It clarifies that investor lists for registered investment companies need not be provided on the schedule.

What document governs the reporting arrangement referenced in the RAMBUS filing?

The filing references an Exhibit 99 showing a 13d-1(k)(1) agreement. Signatures reference powers of attorney incorporated by Exhibit 24 filings from January 2023, indicating delegated authority for filings on behalf of FMR LLC and Abigail P. Johnson.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

RAMBUS INC

(Name of Issuer)

COMMON STOCK

(Title of Class of Securities)

750917106

(CUSIP Number)

05/29/2026

(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

FMR LLC

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 10,756,318.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 11,296,794.81
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

11,296,794.81

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)

10.4 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

CUSIP Number(s): 750917106

1

Names of Reporting Persons

Abigail P. Johnson

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

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 11,296,794.81
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

11,296,794.81

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)

10.4 %

12

Type of Reporting Person (See Instructions)

IN

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,USA,95134
Item 2.
(a)	Name of person filing: FMR LLC
(b)	Address or principal business office or, if none, residence: 245 Summer Street, Boston, Massachusetts 02210
(c)	Citizenship: Not applicable
(d)	Title of class of securities: COMMON STOCK
(e)	CUSIP Number(s): 750917106
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 11296794.81
(b)	Percent of class: 10.4 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: Please see the responses to Items 5 and 6 on the cover page.
	(ii) Shared power to vote or to direct the vote: 0.00
	(iii) Sole power to dispose or to direct the disposition of: 11296794.81
	(iv) Shared power to dispose or to direct the disposition of: 0.00
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. One or more other persons are known to 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 other person's interest in the COMMON STOCK of RAMBUS INC is more than five percent of the total outstanding COMMON STOCK.
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 attached 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.

FMR LLC

Signature:	Stephanie J. Brown
Name/Title:	Duly authorized under Power of Attorney effective as of January 3, 2023, by and on behalf of FMR LLC and its direct and indirect subsidiaries*
Date:	06/04/2026

Abigail P. Johnson

Signature:	Stephanie J. Brown
Name/Title:	Duly authorized under Power of Attorney effective as of January 26, 2023, by and on behalf of Abigail P. Johnson**
Date:	06/04/2026

Comments accompanying signature: * This power of attorney is incorporated herein by reference to Exhibit 24 to the Schedule 13G filed by FMR LLC on January 10, 2023, accession number: 0000315066-23-000003. ** This power of attorney is incorporated herein by reference to Exhibit 24 to the Schedule 13G filed by FMR LLC on January 31, 2023, accession number: 0000315066-23-000038.

Exhibit Information

Please see Exhibit 99 for 13d-1(k) (1) agreement.