The 275-capacity club, which holds a late license to 6am, was purchased for an undisclosed amount.
Vince Power, Chairman and founder of Mean Fiddler, said: "This valuable addition to the portfolio will further strengthen the Group's position as the country's leading live music venue operator."
Mean Fiddler was also involved last week in the success granting of a license for next year's Glastonbury Festival, which it now co-runs with proprietor, Michael Eavis.
In recent months, the battle for London musical superiority has developed into
a straight shoot-out between Mean Fiddler and Carling, who collaborate
on the flagship Reading Festival. Carling have added their name to venues in
Islington, Brixton and Hammersmith, while Mean Fiddler have secured venues in
the West End, Highbury and Camden.