Director Gary M. Pfeiffer filed a Form 4 with the SEC on October 28, 2026, disclosing the sale of 1,203 shares of Quest Diagnostics Inc common stock on October 26, 2026, under a Rule 10b5-1 trading plan.

Key Highlights

  • Reporting person: Gary M. Pfeiffer, a director of Quest Diagnostics Inc (NYSE:DGX)
  • Transaction: Disposition (code S) of 1,203 shares of common stock on October 26, 2026
  • Price per share: $243
  • Post-transaction holdings: 29,802 shares of common stock held directly following the reported sale
  • 10b5-1 plan: The sale was effected pursuant to a Rule 10b5-1 sales plan adopted by Pfeiffer
  • Signed by: Sean D. Mersten, Attorney in Fact for Gary M. Pfeiffer, on October 28, 2026

Gary M. Pfeiffer's October 2026 Share Sale Under 10b5-1 Plan

According to the filing, Gary M. Pfeiffer, listed as a director of Quest Diagnostics Inc (NYSE:DGX), disposed of 1,203 shares of the company's common stock on October 26, 2026, at a price of $243 per share. The transaction is recorded as a sale (transaction code S) in Table I of the Form 4, covering non-derivative securities.

The filing notes that "this sale reported was effected pursuant to a Rule 10b5-1 sales plan adopted by the reporting person." The form also indicates that the checkbox confirming a transaction made pursuant to a contract, instruction, or written plan intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) was checked. Following the reported transaction, Pfeiffer's directly held beneficial ownership in Quest Diagnostics common stock stands at 29,802 shares, according to the filing.

No derivative securities transactions were reported in Table II of the filing. The Form 4 was signed on October 28, 2026, by Sean D. Mersten as Attorney in Fact for Gary M. Pfeiffer, and was filed that same date. No amendment to a prior filing was indicated.

What Was Disclosed

Director Gary M. Pfeiffer disclosed the sale of 1,203 Quest Diagnostics common shares at $243 each on October 26, 2026, under a pre-established Rule 10b5-1 plan, leaving him with 29,802 directly held shares after the transaction.