you really need to send the IRS an amended return with a corrected 8949 & Schedule D. that's where the sale should have been reported. but you also need to get the cost basis of the stock sold which should be about the same as the proceeds. either your company or Morgan Stanley should be able to provide that.
if you have a loss on sale, you might be entitled to a refund whereas if there was a gain you'll likely owe the taxman. Either way I'm sure the IRS will want the forms.
in future years you need to report the sale and the related cost basis on form 8949 which carries to schedule D. if you sell as soon as the day you acquire them, there will be a small gain or loss.
M
