ADP Officer Files Form 144 to Sell $530K in Common Stock

Executive Summary

On September 2, 2026, Christopher D'Ambrosio, an Officer at Automatic Data Processing, Inc. (ADP), submitted a Form 144 notice proposing the sale of 1,872 shares of ADP common stock with an aggregate market value of approximately $529,776.00.

Key Transaction Highlights

• Securities to be Sold: 1,872 Common shares.
• Aggregate Market Value: $529,776.00 (~$283.00 per share).
• Source of Shares: Restricted Stock Vesting on September 1, 2026 (1,872 shares acquired as compensation from the issuer).
• Broker: Fidelity Brokerage Services LLC.
• Trading Plan: The proposed sale is executed pursuant to a pre-arranged Rule 10b5-1 trading plan adopted on September 7, 2025.

Impact & Significance

This filing represents a routine post-vesting disposition under a Rule 10b5-1 plan established nearly a year in advance. Given the modest transaction volume relative to ADP's 397+ million outstanding shares and the pre-scheduled nature of the sale, the trading significance is considered Low.