Shares of Apple Inc. sank Thursday, to suffer their worst day in over two months, after a report of an Apple Watch snag in China, indications of a potential slow ramp for new iPhones and a selloff in the technology sector.

The technology giant’s stock AAPL, -3.17% fell $3.78, or 2.4%, enough to pace the Dow Jones Industrial Average’s DJIA, -0.87% decliners. The selloff nearly kept the Dow from turning positive, as it shaved about 26 points off the Dow, which reversed earlier losses to close up 5.44 points. See Market Snapshot.