“Ashton and Demi are still not divorced, and no settlement has been agreed, even though they have been in negotiations for over a year," a source told the NY Post. "Ashton made a lot of money after they married, but he doesn’t believe he owes her as much as she is asking for.”
The actor and a few high-profile businesspeople -- including Madonna's manager Guy Oseary -- made the initial investment in a tech industry start-up in 2010, a year before he and Demi split.
The value of his share has been estimated as high as $20 million, spurring Demi's $10 million request, the source told the paper.
The 35-year-old actor, who pulled in $24 million for his work on Two and a Half Men in 2012, not only replaced Charlie Sheen on the show, but took his title of TV's highest-paid actor.
Ashton, who's currently dating Mila Kunis, officially filed for divorce in Dec. 2012, more than a year after their Nov. 2011 split.