Billionaire activist investor Carl Icahn’s publicly traded investment fund posted its first annual loss since 2008 last year, undone by plummeting oil prices, the company said in a regulatory filing on Friday. Results were hurt by a halving of oil prices between June and December amid a global supply glut. “This year’s results were obviously disappointing, with the precipitous decline in oil prices impacting the profitability of many of our segments,” Icahn said in a statement.