Biggest U.S. oil ETF sells June holdings; shares plummet

(Reuters) - Shares of United States Oil Fund LP fell more than 16% on Monday after it said it would sell all of its front-month crude contracts to avoid a repeat of the heavy losses suffered last week after crude prices cratered.USO, the United States' largest crude exchange-traded product, declined 39% last week. Retail investors sold the ETF heavily in tandem with a dramatic decline in expiring May oil futures. Fuel demand has dropped 30% worldwide and supply is filling tankers rapidly,..