Cairo Opera Ballet Company was created in 1966.
Your answer depends totally on the size of the opera company. Further, it depends on whether the company includes -- or not -- the opera ballet, the opera chorus, the opera orchestra, the opera production company and crew, the administration for the company, and so forth.
an opera ballet is an opera that incorporates ballet dancing in part to tell the story of the opera
an Opera Ballet is an opera that incorporates ballet dancing in part to tell the story of the opera
The most famous ballet company in Paris is the Paris Opera Ballet. In French, the name is "Ballet de l'Opera national de Paris".
The American Ballet Theatre Company (ABT) dances at the Metropolitan Opera House.
Paris Opera Ballet was created in 1669.
The Royal Ballet was founded in 1931 by Dame Ninette de Valois. It became the resident ballet company of the Royal Opera House in 1946 and was granted a Royal Charter in 1956, becoming recognised as Britain's flagship national ballet company.
Moldova National Opera Ballet was created in 1980.
Ballet is dancing; opera is singing. Although there are operas that include ballet, no ballets that include operas can be found.
Berlin International Opera was created in 2006.
Berlin State Opera was created in 1742.