(EnergyAsia, March 9) — MayBan Securities has recommended a ‘buy’ on the stock of Malaysia-listed energy service company Petra Perdana.   HL Management Co Sdn Bhd has emerged as the substantial shareholder of Petra Perdana Berhad (Petra) with the subscription of 27 million Petra shares at RM2.75 per share from a private placement exercise that…