Technology companies led a broad slide in stocks on Wall Street Tuesday, deepening the market’s September swoon. The S&P 500 fell 2 percent, its worst drop since May. The tech-heavy Nasdaq dropped 2.8 percent, its biggest drop since March. Decliners outnumbered advancers on the New York Stock Exchange 4 to 1. The benchmark S&P 500 is down 3.8 percent so far this month and on pace for its first monthly loss since January. The September slump has been an exception to a mostly steady stream of gains so far this year that has brought the S&P 500 up 15.9 percent since the beginning of 2021. The selling came as a swift rise in Treasury yields forces investors to reassess whether prices have run too high for stocks, particularly the most popular ones. The yield on the 10-year Treasury note, a benchmark for many kinds of loans including mortgages, jumped to …