RITCHEA DAVA 4

What Happened
Dava Ritchea, CFO of Affiliated Managers Group (AMG), exercised/converted derivative awards and received a new equity award on March 5, 2026. The filing shows 601 shares acquired via exercise/conversion at $0.00, a related disposition of 601 derivative shares at $0.00, and a grant of 1,667 shares (award). To satisfy tax withholding on the vesting, 292 shares were automatically surrendered to the company at an implied value of $299.18 per share, generating $87,361.

Key Details

• Transaction date: March 5, 2026; Form 4 filed March 9, 2026.
• Exercises/conversions (code M): 601 shares acquired at $0.00; a related 601-share derivative disposition is also reported at $0.00.
• Tax withholding (code F): 292 shares surrendered at $299.18, totaling $87,361. Footnote F2 confirms the surrender was automatic to cover tax withholding.
• Grant (code A): 1,667-share award reported as acquired at $0.00. Footnotes indicate the award is under the 2020 Equity Incentive Plan and vests in installments (see filing; footnotes reference multi-year vesting).
• Shares owned after the transaction: not specified in the summary provided.
• No late-filing flag is shown here; compare transaction and filing dates if timeliness is a concern.

Context
This filing reflects option/derivative conversion and an equity award vesting rather than an open-market purchase or sale. The surrender of shares to cover taxes is a routine, administrative step and does not necessarily indicate a market-direction signal. For derivative exercises, the filing shows the mechanics (conversion/exercise and tax withholding) rather than a cash purchase in the open market.