There are a few actions that will your M1 account to sell:

• Removing a slice from your Pie will cause the security/pie to be liquidated and the proceeds reinvested.
• Rebalancing
• Withdrawing from your account ; Liquidating your account
• Making changes to targets in your portfolio will not cause your account to trade. 
• Submitting a sell order

For more information on how we trade, please view "How We Trade" document below.