UK's Tullow Oil plunges after Ghana tax tribunal ruling

** Shares of Tullow Oil TLW.L fall 25.6% to 14.5p

** Stock of the West Africa-focused independent oil and gas explorer among the top losers on the London market

** International Chamber of Commerce tribunal rules against Coin $196.5 million tax dispute with Ghana

** Tribunal rejects company's claim that Ghana's corporate income tax assessment on insurance proceeds received between 2016 and 2019 breached its petroleum agreements

** Tribunal also rules that penalties equivalent to 100% of tax assessment not covered by Tullow's contractual protections

** As of last close, TLW up 222.3% YTD