The music mogul has seen his worth swell to £300 million to put him in eighth place in a league of music millionaires compiled for the new Sunday Times Rich List, which will be published at the weekend.
Topping the music list - as he did last year - is London-based Ukrainian businessman Len Blavatnik, whose empire includes the Warner Music Group which was acquired in 2011. He is estimated to be worth £10 billion.
Simon's value will have been boosted by a new deal with ITV for further series of The X Factor and Britain's Got Talent, and appears not to have been seriously dented by the stage flop of spoof musical I Can't Sing! - for which he was one of the backers - which closed after a matter of weeks.