I am at a start up and our company issued restricted stock to new investors/employees. I was told that the issuance was invalid because S-corps cannot have different classes of shares, and restricted stock is considered a different share class. Does this mean that that we will need to reissue the stock? Also, the people that were issued the restricted stock all filed 83b elections upon the stock issuance. Does this mean that the 83b election is invalid, as well?