NEW YORK, July 10 (Reuters) - Short interest on the New York Stock Exchange rose 1.5 percent in late June, the exchange said on Thursday. As of June 30, short interest rose to about 18.717 billion shares, compared with 18.434 billion shares as of June 13. Investors who sell securities short borrow shares and then sell them, expecting the stock to fall so they can buy the shares back at the lower price, return them to the lender and pocket the difference.