The story
The Company’s common shares were admitted to trading on the Alternative Investment Market in December 2005 and were subsequently moved up to the Official List and to trading on the main market of the London Stock Exchange on 16 March 2009. The shares have been included in the FTSE 250 Index since 22 June 2009, and are categorized as Equity Shares (Commercial Companies).
From Wikipedia’s article on Lancashire Holdings, shared under CC BY-SA 4.0.4