The New York Stock Exchange is setting its sights on short-sellers, The New York Post reports. This is an area where we have seen problems, and you can expect enforcement actions, Susan Merrill, who heads oversight at the Big Board, said at a conference Monday. Top on the list, said Merrill, are short-sellers involved with the secondary offerings, a market that has been heating up this year. Robert Marchman, who heads the NYSEs market-surveillance unit, suggested that short-sellers might have artificially depressed prices before some secondary offerings were issued. Marchman said his department, which has been working with the Securities and Exchange Commission on the matter, would be concentrating in particular on brokers that conduct trades for hedge funds.