The Dow Jones Industrial Average tumbled more than 600 points Monday as anxiety over the health of technology behemoths sparked a broad retreat from the stock market.

Monday’s selling began in the technology sector, then morphed into a rout that dragged lower everything from oil conglomerates to manufacturers to entertainment firms. It was the latest setback for the stock market, which has struggled to break out to new highs since the S&P 500 capped off its worst month in more than seven years.

Apple ’s 5% decline sparked the selloff in the tech sector after one of its suppliers cut its outlook—triggering fresh worries about demand for the company’s iPhone line. Goldman Sachs , meanwhile, took more than 100 points off the Dow industrials as concerns grew over the bank’s interaction with a financier charged with stealing billions of dollars from the 1Malaysia Development Bhd. investment fund.

And General Electric suffered its fourth consecutive decline after comments from the firm’s chief executive failed to assuage investors’ worries about the future of the industrial conglomerate.

To some, the pullback reinforced beliefs that stocks aren’t yet past the hurdles they tripped over in October. Many of the worries that cropped up that month remain in play: questions about global growth, eurozone tensions and nervousness around chip makers and consumer-device companies that had driven much of the bull market’s gains earlier in the year.