S&P 500 has biggest loss in nearly 4 weeks as tech stumbles

This photo provided by the New York Stock Exchange shows the trading floor as Pershing Square Tontine Holdings, Ltd. officially begins trading, Wednesday, July 22, 2020. (NYSE Photo by Colin Ziemer via AP)

NEW YORK — Slumping stocks across most of Wall Street sent the S&P 500 to its worst loss in nearly four weeks on Thursday, undercut by a report showing layoffs are picking up throughout the country with coronavirus counts.