KUALA LUMPUR (AFX-ASIA) – Malakoff Bhd has been trading higher on speculation that it plans to seal a deal with Tenaga Nasional Bhd to buy an additional 20% stake in Segari Energy Ventures Sdn Bhd and sell a 20% stake in GB3 Sdn Bhd to Tenega in return, dealers said. “An increased investment in Segari,…