Share your insights or perspective on the financial matter presented in the input.

Consequences of buying/selling a large number of shares for a low volume stock?
First, If you buy $10K of a penny stock and try to sell it that afternoon, you probably won't get your money back. The bid/ask spread may cost you dearly.  On the shady side, if you are able to afford to trade enough shares to attract attention, the interest of those who believe the volume is an indication of some real event happening, you may pump it high enough to make some nice money, selling into the ensuing rise. This is a classic pump and dump (which often but not always, includes posts on message boards) and it is illegal. The same way this volume attracts traders, it can also attract the attention of the SEC.  This should be read as a narrative, not as advice. If anything, it's advice on what not to do.