Each week, we pick the biggest, most dramatic, or most captivating winners and losers in the world of money and business. Here are the winners and losers for July 29-Aug. 4.

WINNERS

The Boeing Co.

The Boeing Co. (NYSE: BA), the biggest U.S. aerospace manufacturer, made a deal to sell 50 of its 737 airplanes to Singapore Airlines Ltd. (Singapore: C6L) in a major victory over its largest rival, the Airbus unit of EADS N.V. (Paris: EAD). Boeing has been trouncing Airbus in commercial-airplane sales by a ratio of more than 2-to-1 this year. Boeing's stock rose 82 cents, or 1.14 percent, to $72.81 on Friday.

Gabby Douglas

Freshly minted women's all-around Olympic gold medalist gymnast Gabby Douglas, 16, is set to rake in as much as $12 million through endorsement deals during the next four years leading up to the Rio 2016 Olympic Games, according to CNN Money. Douglas has already signed on with the Kellogg Co. (NYSE: K) to grace boxes of its Corn Flakes with her winning smile. A Wheaties box might still be in her future, though, as General Mills Inc. (NYSE: GIS) hasn't said what's its post-Olympics plans are.

LinkedIn Corp.

Shares of the LinkedIn Corp. (NYSE: LNKD), the biggest professional-networking website, rose on Friday by the most in almost six months, after the company posted robust second-quarter financial results highlighted by an 89 percent jump in revenue, to $228.2 million. The Mountain View, Calif.-based firm also raised its full-year outlook. Shares of LinkedIn rallied 16 percent to close at $108.51 in Friday's session. As one of the best-performing recent technology initial public offerings, LinkedIn appears unstoppable in the midst of a sell-off of social media stocks.

LOSERS

Facebook Inc.

Shares of Facebook Inc. (Nasdaq: FB) took a pummeling this week as they dipped to $19.86 Thursday before recovering to $21.09 Friday. The former day marked the first time Facebook's stock price had dipped below $20, and the drop represented a 47.7 percent fall in value from the company's IPO price of $38. Facebook was the first U.S. tech company with an IPO more than $100 billion, but investors who bought in early have suffered as the social-networking giant has struggled to convert users and ads into revenue.

Ford Motor Co. and General Motors Co.

Both the Ford Motor Co. (NYSE: F) and General Motors C. (NYSE: GM) lost market share to resurgent Japanese automakers such as the Toyota Motor Corp. (NYSE: TM) last month. GM reported its July sales were down 6 percent from the year before, while Ford barely did better with its sales down 4 percent. Both companies attempted to blame their poor performance on depressed fleet sales, but the analysts' consensus was that Japan's companies were finally returning to full strength after last year's triple disaster (earthquake, tsunami, and nuclear meltdowns) in Japan, which cut into market share that domestic U.S. automakers had gobbled up in the aftermath.

Knight Capital Group Inc.

Financial market maker Knight Capital Group Inc. (NYSE: KCG) was battered by software problems at the New York Stock exchange on Wednesday, which distorted the stock prices of more than 100 companies. The glitch resulted in a pretax loss of $440 million. The Wall Street Journal reported Friday that the company received a line of credit from an undisclosed source. Its share price rebounded by $1.47 on Friday to close at $4.05, but it was down $6.26, or 60.72 percent, during the week.

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