Companies issue more stock all the time and it definitely has some impact on the market as it devalues a single share. If a company simply turned each share in

Companies issue more stock all the time and it definitely has some impact on the market as it devalues a single share. If a company simply turned each share into two shares, then the market cap would be the same but the fractions of the markteshare that can be traded are smaller. If the company suddenly issued the entire stock on the market again, the price would plummet to half.