Birinyi Associates President Laszlo Birinyi

Birinyi Associates President Laszlo Birinyi

Jin Lee/Bloomberg

“I have not seen the kinds of things that would trouble me,” said Laszlo Birinyi, president of Birinyi Associates Inc. “When I start seeing people talking about S&P 2,000 or buy more Netflix after it’s up that much, then it starts to trouble me.”