Has anyone thought about using an ECN in after-hours for transfering a block of stocks from one brokerage account to another? Just wait for liquidity to dry up, setup two opposing orders, click submit and viola, instant transfer for the cost of one round trip commission (no slippage). A lot faster than ACATS for a small fee. With the wash sale rule, even your holding time won't be affected. Is this legal in regular trading accounts (non-retirement)? Does it work in practice?