What were the three businesses? How many employees did each have? What was these businesses annual gross?
Running around as a Lobbyist or setting up a Corporation for tax reasons with a hand full of assistants does not constitute having Executive experience. If that were the case, Joe at Joe's Pizza Shop would be an executive.
Newt was never a lobbyist. He owned businesses and employed a number of people.
(excerted from Wikipedia)
Businesses
After leaving Congress in 1999, Gingrich started a number of for-profit companies:[98] Between 2001 and 2010, the companies he and his wife owned in full or part had revenues of almost $100 million.
According to financial disclosure forms released in July 2011, Gingrich and his wife had a net worth of at least $6.7 million in 2010, compared to a maximum net worth of $2.4 million in 2006. Most of the increase in his net worth was because of payments to him from his for-profit companies.