o·ver·trade 
(ō′vər-trād)
(ō′vər-trād)v. o·ver·trad·ed, o·ver·trad·ing, o·ver·trades
v.intr.
1. To buy and sell securities too frequently, resulting in excessive volatility or high transaction costs.
2. To exceed the ability of a business to finance its operations by increasing sales too rapidly.
v.tr.
To buy and sell securities in (a market) too frequently.