What does After Hours (AH) mean? After Hours (AH) refers to market action that takes place after the cash market close, which is defined as 9:30 AM ET to 4:15 PM ET. Related articles What is the JPM Collar? What is a Bear Put Spread? What is the difference between At-the-Money, In-the-Money and Out-of-the-Money Options? What are Options Liquidity Providers? What is 1 Month Realized Volatility (1MRV)?