Offer your thoughts or opinion on the input financial query or topic using your financial background.

Why is a stock trade flat on large volume?
Large volume just means a lot of market participants believe they know where the stock price will be (after some amount of time).  The fact that the price is not moving just means that about 50% of those really confident traders think the stock will be moving up, and about 50% of those really confident traders think the stock will be moving down.