Photon Kathas Productions is making great strides in the film industry. The latest buzz is that ace musician A R Rahman has bought three percent of the total stake in the company. The company will open up for a public issue in the London market on mid october.Photon Kathas will be listed in the Alternative Investment Market for growing companies with the London Stock Exchange. More production companies are expected to soon follow suit especially after a recent news article in a British paper highlighted the inefficiency of the south Indian production companies to tap the profits from Intellectual Property Rights.