DexCom Officer Files Form 144 Notice to Sell $221K in Common Stock

Executive Summary

On September 28, 2026, DexCom, Inc. officer Sadie Stern filed a Form 144 notice disclosing the proposed sale of 2,565 shares of common stock with an estimated aggregate market value of $220,974.75 (approximately $86.15 per share). The proposed sale is executed through Morgan Stanley Smith Barney LLC.

Transaction Details

• Filer: Sadie Stern (Officer)
• Shares Proposed for Sale: 2,565
• Aggregate Market Value: $220,974.75
• Acquisition Origin: The shares were originally acquired on March 8, 2024, directly from the issuer as restricted stock.
• Trading Plan: The planned disposition is executed under a pre-established Rule 10b5-1 trading plan adopted on May 28, 2026.
• Prior Transactions: In the preceding three months, Stern sold 2,565 shares on August 27, 2026, generating gross proceeds of $226,669.05.

Trading Significance

This filing carries Low trading significance. The 2,565 shares represent a negligible fraction of DexCom's 377,360,765 total shares outstanding. Furthermore, the transaction is executed under a predetermined Rule 10b5-1 trading plan established four months prior, matching a scheduled cadence of sales following an identical transaction in August 2026.