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Should I wait a few days to sell ESPP Stock?

My employer allows employees to buy company stock every six months (on Jan 1 and July 1) at a 15% discount. Naturally, this seems like a good deal and I imagine there are many employees who participate.

I'm curious: How do you think a company's stock price is influenced, if at all, by such a purchasing program? For example, is it possible that the shares could artificially go up/down by a few cents on Jan 1 and July 1 because of the fixed purchases that will be made on those days?

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