Quest Diagnostics Officer Files Form 144 to Sell $5.58M in Common Stock

Executive Summary

On November 3, 2026, Catherine T. Doherty, an Officer at Quest Diagnostics Inc ($DGX), filed a Form 144 notice of proposed sale covering 22,105 common shares with an estimated aggregate market value of $5,584,607.20 (implied price of ~$252.64 per share).

Transaction & Acquisition Details

• Security: Common Stock
• Shares Proposed for Sale: 22,105
• Aggregate Market Value: $5,584,607.20
• Acquisition Origin: Stock option exercise from the issuer on November 3, 2026, paid in cash.
• Broker: Fidelity Brokerage Services LLC
• Trading Plan: The proposed sale is executed pursuant to a pre-established Rule 10b5-1 trading plan adopted on August 3, 2026.

Market Impact & Significance

• Relative Size: With 110,019,073 common shares outstanding, the 22,105 shares represent roughly 0.02% of total shares outstanding, posing minimal dilution or liquidity impact on the open market.
• Trading Significance: Rated as Medium. Although the dollar volume is notable at over $5.5M, the transaction represents an exercise-and-sell execution under a pre-scheduled Rule 10b5-1 plan adopted three months prior, dampening concerns of discretionary insider selling.