United Therapeutics Officer Paul Mahon Files Form 144 to Sell $4.0M in Common Stock

Executive Summary

On September 3, 2026, Paul Mahon, an Officer of United Therapeutics Corp ($UTHR), filed a Form 144 notice proposing the sale of 8,300 shares of common stock with an estimated market value of $4,000,836.55 (~$482.03 per share).

Transaction & Plan Details

• Security: Common Stock
• Proposed Sale Quantity: 8,300 shares
• Aggregate Market Value: $4,000,836.55
• Shares Outstanding: 42,890,692 shares (proposed sale represents ~0.02% of total outstanding shares)
• Acquisition Source: Stock Option Exercise from the issuer on September 3, 2026, settled in cash.
• Trading Plan: Executed pursuant to a Rule 10b5-1 trading plan adopted on August 11, 2025.
• Broker: Morgan Stanley Smith Barney LLC

Historical Context (Past 3 Months)

The insider has executed consistent, bi-weekly sales of 8,300 shares under the 10b5-1 plan:

• August 20, 2026: 8,300 shares for $4,342,078.81
• August 6, 2026: 8,300 shares for $4,291,512.51
• July 16, 2026: 8,300 shares for $4,429,637.79
• July 2, 2026: 8,300 shares for $4,586,274.56
• June 18, 2026: 8,300 shares for $4,494,840.93
• June 4, 2026: 8,300 shares for $4,540,642.45

Market Significance

This filing represents routine, scheduled divestments tied to option exercises under a pre-arranged Rule 10b5-1 plan established over a year prior. Due to its automated and recurring schedule, the trading significance is categorized as Low.