I there is something else going on. You should get a 1099-B for your stock trades. A 1099-MISC indicates that there is something else going on. It may not be self-employment, but it is other income of some kind.
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Best I can figure is that it's from cash-in-lieu-of-stock dividend payouts, but I would have thought that would have been covered on the 1099-DIV, which I also got. Etrade does a combined 1099.
In case anyone wondering on source of the income, for my case it was E-trade promotion to transfer or deposit $X during the promotion period. Guess Etrade could have reported this as 1099-INT instead of 1099-MISC like all other banks do to for promotional offers.