It means that if you own over 2/5% of a listed company or 20/25% of a private company (depending if your ownership has or not voting rights), you cannot include the sale of those stocks in the flat tax in the first 5 years.Thanks for the feedback and the link @Martin Everson
By the way guys, in the flat tax description, what is meant by the part in bold:
In other words: you cannot move to Italy and exit your business immediately tax free, you must wait 5 years.