Before the blackout period begins on December 24, 2025, at 1 p.m. ET:

Review your account and finalize all transactions at Empower. Contact Empower at 844-465-4455 or visit www.myrivian401k.com.

After the blackout period, expected to end during the week of January 18, 2026, visit www.NetBenefits.com or call Fidelity to:

• Register your account. If you have an existing Fidelity account, use the same login information to access your Rivian 401(k) Plan account.
• Elect how you want to receive important Plan information. Select U.S. mail to receive print communications or provide your preferred email address and elect eDelivery if you'd like to receive emails.
• Transact in your Plan account, including enrolling or changing your investment elections.
• Confirm or designate a beneficiary. Your beneficiary designation will transfer from Empower to Fidelity only if information is in good order.
• Review your final account statement from Empower with your Fidelity statement. Your final quarterly Empower statement will be available online in January 2026. Fidelity’s statements are available online at any time for on-demand viewing and printing. Please note that statements will not be automatically mailed to your home. To change your mail preferences, visit NetBenefits and select Profile, then Preferences.    

                                           
General transition-related questions
Contact Fidelity at 800-835-5095, weekdays between 8:30 a.m. and 8:30 p.m. ET, excluding most holidays. 

Please note: Fidelity will not be able to answer questions about your individual Plan account until the transition is complete during the week of January 18, 2026.