I would not use a giant limit order for this. You will only depress the stock price and feed the HF traders. Instead, I would watch the stock. You clearly have a price that you are willing to sell at. When you see a solid volume day with the stock rising, give the buyers what they want (in chunks). Rather than dump a ton of sell volume into an eager market, throw pieces to the hungry dogs gradually and keep them hungry. This will take a while, but you will likely end up with better execution. If you are lucky the company will announce some positive news or some idiot sell side analyst will upgrade the stock and there will be a flurry of buying on good volume. In that case you may be able t sell into the strength and liquidate pretty quickly.