PDI : SET lifts "H" sign from PDI The Stock Exchange of Thailand (SET) will lift "H" (HALT) sign from PDI's securities in the first trading session of May 9, 1996 at 11.15 a.m. because material information has been disclosed by the company to the public through the exchange. Previously, the SET has posted "H" sign on PDI's securities in the first trading session of May 9, 1996 at 9.45 a.m. due to waiting for material information from the company.