Luc Seraphin - 01 Apr 2026 Form 4 Insider Report for RAMBUS INC (RMBS)

Reporting relationship: President and CEO, Director
Issuer ticker: RMBS
Reported as of: 01 Apr 2026
Net transaction value: -$470,188
SEC form: 4
Accepted by SEC: 03 Apr 2026, 20:15:48 UTC
Prior SEC filing: 03 Mar 2026
Source filing: View source filing
Reporting owner signature: /s/ Brian Wu, by power of attorney

Key filing fact

Luc Seraphin filed Form 4 for RAMBUS INC (RMBS) on 03 Apr 2026.

Key facts

This page summarizes Luc Seraphin's Form 4 filing for RAMBUS INC (RMBS).
5 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 03 Apr 2026, 20:15.

Change

Previous filing in this sequence was filed on 03 Mar 2026.
Current net transaction value: -$470,188.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001341984 Primary reporting owner

Seraphin Luc

Relationship: President and CEO, Director
Address: C/O RAMBUS INC., 4453 NORTH FIRST STREET, SUITE 100, SAN JOSE
Signature: /s/ Brian Wu, by power of attorney
Signature date: 03 Apr 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

RMBS transaction

Common Stock

Award

Transaction value
Shares: +32,684
Change %: +9.9%
Price: $0.000000^*
Shares after: 363,754
Date: 01 Apr 2026
Ownership: Direct
Footnotes: F1

RMBS transaction

Common Stock

Tax liability

Transaction value
Shares: -12,561
Change %: -3.5%
Price: $89.95^*
Shares after: 351,193
Date: 01 Apr 2026
Ownership: Direct
Footnotes: F2

RMBS transaction

Common Stock

Sale

Transaction value: $216,045
Shares: -2,511
Change %: -0.71%
Price: $86.04
Shares after: 348,682
Date: 02 Apr 2026
Ownership: Direct
Footnotes: F3, F4

RMBS transaction

Common Stock

Sale

Transaction value: $239,565
Shares: -2,750
Change %: -0.79%
Price: $87.11
Shares after: 345,932
Date: 02 Apr 2026
Ownership: Direct
Footnotes: F3, F5

RMBS transaction

Common Stock

Sale

Transaction value: $14,578
Shares: -165
Change %: -0.05%
Price: $88.35
Shares after: 345,767
Date: 02 Apr 2026
Ownership: Direct
Footnotes: F3, F6

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Rule 10b5-1 trading plan

These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.

Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).

Explanation of responses 6 footnotes

Footnote F1

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

Footnote F2

The shares were withheld to cover the Reporting Person's tax liability in connection with the vesting of restricted stock units, or RSUs.

Footnote F3

The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted on November 11, 2025

Footnote F4

The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $85.70 to $86.48, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the Staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

Footnote F5

The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $86.81 to $87.80, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the Staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

Footnote F6

The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $87.85 to $88.71, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the Staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.