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How to execute a large stock purchase, relative to the order book?
What is the average daily volume traded? It looks like this stock may have a liquidity problem. If that is the case I would not buy this stock at all as you may have the same problem when you try to sell it. Generally try to stay away from illiquid stocks, if your order size is more than 10% of the average daily volume traded, then don't buy it.  I usually stay away from stocks with an average daily volume of less than 100,000.