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Can I buy only 4 shares of a company?
I'm not sure it is the best idea, but you can buy only 4 stocks generally.  As you alluded to, you should take notice of the fees.  Also note that many stocks trade at significantly lower prices than Apple's per shares, so you might want to factor that into your decision.  You could probably get a better feel for transactions if you bought say 50 shares of a $30 stock; then it might be easier to see what it's like to sell some, etc. Note that specific trading sites might have various limits in place that would pose as barriers to this sort of behavior though.