There are 20 types of 1099 forms. 1099-MISC, 1099-B, 1099-DIV, 1099-INT, 1099-OID, 1099-R and quite a few more. Which do you have?
Generally, gains from the stock market are not "earned" income and are therefore not reported on a 1099-MISC. But if investing is your primary source of income, it could most certainly be considered earned income; especially if you're a day trader; even part time.
