<prompt> Human: My company has a decent ESPP: can contribute up to 10 of earnings, 15 discount on shares, six month purchase period with look back;I want to know whether I should be immediately selling these shares and putting the cash into something else, or holding the shares and collecting dividends hoping the share price goes up. Were a major US airline, and our stock has historically been one of the best performers in the industry, however theres been some volatility in the last year or so. Any thoughts?Thanks!  <response>: Sell immediately.It is a great deal to have an ESPP, take advantage of it.But, think about it, would you drop 15K into any ONE random stock? Might turn out OK, or it might not.Better off investing that money into an index fund where the risk is spread out over many, many companies. 