The businessman arrested on suspicion of alleged insider trading this week was trading in the shares of Open Orphan, the Irish-led company that is listed on the AIM stock market in London. The businessman was not working for the Irish company, a rapidly growing niche contract research PLC. However, he is alleged to have had access to inside information into the stock.  The man, aged in his 60s, is being questioned by detectives from the Garda National Economic Crime Bureau (GNECB) in connection to trades a number of years ago. He is not a well-known person in Irish business. The…