Insider files Form 144 to sell 5,426 shares

Luc Seraphin reported intended sales of 5,426 shares of Common Stock (restricted) via a Form 144; the filing lists this security as restricted stock and dates the sale 04/01/2026.

Accepted by SEC EDGAR 04/02/2026 - 04:10 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Luc Seraphin reported intended sales of 5,426 shares of Common Stock (restricted) via a Form 144; the filing lists this security as restricted stock and dates the sale 04/01/2026.

The filing also shows a prior disposition of 39,914 Common shares on 03/02/2026 with an aggregate value of $3,936,697.86. Other line items in the excerpt include $470,187.86 and a figure of 107,790,732, each presented in the securities information section.

Insights

Securities Compliance Analyst

Form 144 records a planned restricted‑stock sale and a recent disposition by the same reporting person.

The excerpt lists 5,426 restricted Common shares to be sold (dated 04/01/2026) and a prior sale of 39,914 shares on 03/02/2026. Form 144s are the standard notice used when affiliates sell restricted or control securities under Rule 144.

Cash flow details and certain numeric labels appear in the table; the excerpt shows $470,187.86 alongside the 5,426 line and $3,936,697.86 tied to the prior sale. Subsequent filings may clarify transaction mechanics and exact proceeds allocation.

Key Figures

Planned sale: 5,426 shares Prior sale quantity: 39,914 shares Prior sale aggregate value: $3,936,697.86 +2 more

5 metrics

Planned sale 5,426 shares Securities To Be Sold line dated 04/01/2026

Prior sale quantity 39,914 shares Securities Sold During The Past 3 Months dated 03/02/2026

Prior sale aggregate value $3,936,697.86 Value listed next to 39,914 shares sold on 03/02/2026

Value shown with 5,426 line $470,187.86 Amount appearing in the securities information row associated with 5,426

Securities information figure 107,790,732 Number listed in the securities information row dated 04/02/2026

Key Terms

Form 144, Restricted Stock, Securities Sold During The Past 3 Months

3 terms

Form 144 regulatory

"Securities To Be Sold line and header '144: Securities To Be Sold'"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

Restricted Stock financial

"Entry reads 'Restricted Stock' next to the 04/01/2026 sale line"

Shares granted to an individual that carry limits on transfer or sale until certain conditions are met, such as staying with the company for a set time or hitting performance targets. Think of them as a locked gift that gradually opens; for investors they matter because they affect how many shares may enter the market later, signal management incentives and potential dilution, and reveal confidence in future company performance.

Securities Sold During The Past 3 Months regulatory

"Section label preceding the 03/02/2026 transaction row"

FAQ

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

What does Luc Seraphin's Form 144 for RMBS report?

It reports an intended sale of 5,426 restricted Common shares dated 04/01/2026. The filing also shows a prior sale of 39,914 shares on 03/02/2026 with an aggregate value of $3,936,697.86.

How much value is shown for the recent prior sale by the reporting person?

The excerpt lists an aggregate value of $3,936,697.86 for the 39,914 shares sold on 03/02/2026. This figure appears in the "Securities Sold During The Past 3 Months" row.

Are the 5,426 shares described as restricted or freely tradable?

The filing labels the 5,426 Common shares as Restricted Stock. The entry under "Securities To Be Sold" identifies the security type as restricted on 04/01/2026.

Does the Form 144 excerpt show outstanding shares for RMBS?

The table includes the number 107,790,732 in the securities information row dated 04/02/2026. The excerpt presents this number alongside other security fields in that section.

Who is the broker or placement agent listed on the Form 144?

The excerpt names Morgan Stanley Smith Barney LLC with an address at 1 New York Plaza, 8th Floor, New York, NY 10004 in the securities information section.

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

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Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001341984
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	RAMBUS INC.
SEC File Number	000-22339
Address of Issuer	4453 North First Street Suite 100 San Jose CALIFORNIA 95134
Phone	(408) 462-8000
Name of Person for Whose Account the Securities are To Be Sold	LUC SERAPHIN
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer
Relationship to Issuer	Director

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	5426	470187.86	107790732	04/02/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	04/01/2026	Restricted Stock	ISSUER			5426	04/01/2026	Not Applicable

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
LUC SERAPHIN 4453 North First Street Suite 100 San Jose CA 95134	Common	03/02/2026	39914	3936697.86

144: Remarks and Signature

Remarks
Date of Notice	04/02/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	11/11/2025
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Luc Seraphin
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)