Tech wins: Microsoft, Amazon and Google's parent company Alphabet all notched gains Friday, a day after the three tech giants reported surprisingly strong quarterly results that beat estimates for both income and revenue. Microsoft jumped 10 percent, to $52.87, while Amazon gained 6 percent, to $599.03. Alphabet climbed 8 percent, to $702.

Bumpy ride: Harley-Davidson sank 12 percent to $49.54 Tuesday after the company reported a drop in third-quarter profit and cut its forecasts for motorcycle shipments. Harley shares closed the week at $48.20.

In gear: General Motors jumped 5.1 percent Wednesday to $35.20 after the automaker delivered better-than-expected earnings and revenue for the third quarter. Strong North American sales helped GM overcome $1.5 billion in costs from its deadly ­ignition switch recall. The stock closed Friday at $35.95.

Reboot: IBM shares tumbled 5.4 percent to $141.21 Tuesday, a day after the company's latest earnings report showed that weak hardware sales and a strong dollar brought down its revenue. It was the 14th straight quarter of revenue declines. Shares closed Friday at $144.68.

Oprah weighs in: Weight Watchers surged 77 percent, to $12.05 Monday on news that Oprah Winfrey is paying about $43.2 million for a 10 percent stake in Weight Watchers and is joining the weight management company's board. Winfrey also agreed to endorse the company's programs. Weight Watchers' shares closed the week at $15.75.

Falling short: Homebuilder PulteGroup fell 7.5 percent to $17.99 Thursday after the company reported third-quarter earnings and revenue that fell short of Wall Street's forecasts. The builder closed the week at $18.34.

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