NEW YORK—Wall Street ended mixed Monday after weakness in the technology sector punctured some of the market’s enthusiasm over a report that suggested the economy could still be growing.

But comments from memory chip maker SanDisk Corp. about soft sales helped pull stocks off their highs and sent tech shares lower. The Dow Jones industrial average, which had been up more than 100 points, finished well off its highs.

The Conference Board’s leading economic indicators report showed a 0.1 percent rise for April, following a similar uptick in March. The index, aimed at pred...