Rivian Officer Michael J. Callahan Files Form 144 Notice of Proposed Sale

Executive Summary

On October 1, 2026, Michael J. Callahan, an Officer of Rivian Automotive, Inc. (CIK: 0001874178), submitted a Form 144 filing declaring the intention to sell 15,000 shares of Rivian Common Stock. The aggregate market value of the shares proposed to be sold is approximately $225,000.00, implying an average price of $15.00 per share.

Transaction Details

• Security: Common Stock
• Number of Shares: 15,000
• Aggregate Market Value: $225,000.00
• Approximate Sale Date: October 1, 2026
• Securities Origin: Acquired via Restricted Stock grants from the Issuer on August 15, 2023 (4,833 shares) and November 15, 2023 (10,167 shares).
• Broker: Morgan Stanley Smith Barney LLC Executive Financial Services
• Trading Plan: Adopted under Rule 10b5-1 on June 12, 2026.

Prior Sales & Context

Within the past three months, Mr. Callahan executed a prior sale of 15,000 shares on September 11, 2026, generating gross proceeds of $244,390.50.

Significance Assessment

The trading significance is assessed as Low. The proposed transaction of 15,000 shares represents a negligible fraction of Rivian's 1,443,948,130 shares outstanding and is executed under a pre-scheduled Rule 10b5-1 trading plan established in June 2026.