I am running a trading system on XIV based on closing prices. I may trade up to 50,000 shares. If I enter my trade at 3:55 PM, how would you suggest placing it? Since the XIV market is typically a penny wide, (currently 24.09 - 24.10), I could place a limit order to buy at the offer or to sell at the bid. But I've noticed that since XIV moves so much, the market has often moved away from my order by the time it is placed. I could use a more aggressive limit order such as buying 2 cents above the offer. But will this get me a worse fill? In my backtests I have baked in a bid-ask spread of 1 cent.
I am using Interactive Brokers.
I am using Interactive Brokers.