Sanchez Computer Associates' stock price rose 26% Thursday, to $18.6875  per share, after company officials dispelled investors' concerns over   second-quarter earnings.   
Speaking at an investors' conference in New York, Sanchez officials said  they expect to meet or exceed second-quarter expectations of about $10   million in revenues and earnings per share of 11 cents.   
  
"There were rumors about what our earnings were going to be this  quarter, so, in an effort to stave those off, we felt that it was important   to get out there and make that statement," said R.J. "Zap" Zlatoper, chief   executive officer of the Malvern, Pa.-based company.     
Sanchez Computer sells core banking software to large banks.
  
The company's stock was among the best performers on the Nasdaq in 1997,  rising 157% in 1997 largely because of annual revenue growth rates that   exceeded 60%, said Charles Wittman, an analyst at Wheat First Union.   
The three Wall Street firms that cover Sanchez Computer rate the stock a  "buy." 
But investors apparently had doubts about whether the company would be  able to maintain its rapid growth pace, according to its short interest   position listed on Bloomberg News.   
  
Of Sanchez Computer's 12 million shares outstanding, roughly one million  shares were sold short. Short-sellers make a bet that a stock price will   fall.   
"Don't bet against Sanchez," Mr. Zlatoper said. "We are very enthused  and optimistic about our future."