SOLT is a not-for-profit organisation which speaks on behalf of the theatre owners, producers, and managers of all the major commercial and grant-aided theatres in London.

[1] SOLT shares an office with UK Theatre, its sister organisation.

[2] As well as advocating for the interests of its members, SOLT promotes theatre through activities including the Laurence Olivier Awards, the TKTS ticket booth, Theatre Tokens, a fortnightly printed listings guide and website.

The organisation also administers the audience development initiatives Kids Week and Official London Theatre's New Year Sale, and runs events including the 'behind-the-scenes' career fair, TheatreCraft, and West End LIVE, alongside Westminster City Council.

SOLT also supports a number of theatrical charities including Stage One and Mousetrap Theatre Projects.