ADP Officer Joseph DeSilva Files Form 144 to Sell $178K in Common Stock Under Rule 10b5-1

Insider Filing Analysis: Form 144 Summary

Automatic Data Processing, Inc. (NASDAQ: ADP) officer Joseph DeSilva has filed a Form 144 notice of proposed sale covering 631 shares of common stock with an aggregate market value of approximately $178,490.97 (implied price of ~$282.87 per share).

Key Details:

• Filer: Joseph DeSilva, Officer
• Shares to be Sold: 631 shares
• Approximate Sale Date: September 3, 2026
• Broker: Fidelity Brokerage Services LLC
• Trading Plan: Executed pursuant to a Rule 10b5-1 trading plan adopted on September 3, 2025.
• Origin of Shares: Acquired on September 1, 2026, via restricted stock vesting as part of executive compensation.

Prior 3-Month Activity:

• Sold 6,512 shares on September 2, 2026, for gross proceeds of $1,842,896.00.

Market Context & Significance:

• Low Significance: The proposed transaction of 631 shares is modest relative to total shares outstanding (397,262,737 shares) and follows a pre-scheduled Rule 10b5-1 trading plan adopted a year prior, typically used for routine tax-withholding or diversification following equity vesting.