KKR, an investment company, offered to acquire Greenvolt, an energy production from residual forest biomass company, for $1.3bn. KKR’s Gamma Lux fund offered €8.3 ($9) a share for Greenvolt, an 11% premium on the company’s closing share price on December 20. The green energy firm’s stock jumped to the offer price when trading resumed after being suspended by Portugal’s stock market regulator earlier on December 21.