Both CNBC and TheStreet.com have separately reported problems with their respective stock trading contests.
The CNBC contest site apparently had a coding flaw that allowed traders to open an order entry window before market close, then wait until after hours to actually enter the order, which would be executed the closing price.
The more interesting comment from CNBC is this:
In addition, there have been allegations that one or more contestants may have engaged in illegal market manipulation to affect actual prices of stocks represented in their contest portfolios.
With a million dollars at stake, this seemed like a plausible scenario even before the contest started. It’s unclear to me whether “illegal market manipulation” here actually means “illegal under contest rules” or “illegal under SEC regulations”, but it seems quite feasible.
Along similar lines at TheStreet.com, which offered $100,000 in their contest: