The S&P 500's Biggest Movers on the Week

September appears to finally be living up to its swoon-inducing reputation. The S&P 500 fell 2.2% last week, to 1,044.38, closing out three straight days of losses after a choppy start to the week.

Pops and drops
Here are the five biggest S&P 500 upticks and five biggest S&P 500 drops of last week (measured Friday close to Friday close):

Winners on the week:

Source: Capital IQ (a division of Standard & Poor's).

Losers on the week:

Source: Capital IQ (a division of Standard & Poor's).

A look at some of the movers
Shares of Sara Lee popped last week after the company known for its frozen desserts announced the sale of a portion of its body-care and European detergent business to Dutch consumer giant Unilever for $1.88 billion in cash. Sara Lee said it is also issuing a new $1 billion share repurchase program.

Ford said it would build an assembly plant in China, marking the car company's third factory in China. The move comes as Ford accelerates its efforts to compete in that country.

Controversy continues to swirl around Moody's after former employee Eric Kolchinsky accused the credit-rating agency of inflated debt ratings. The comments come after Moody's and other agencies supposedly instituted stricter policies in response to stamping overly optimistic ratings on debt securities, which were the centerpiece for the financial crisis.

Red Hat climbed last week after posting strong fiscal-second-quarter results that trumped analyst estimates. The seller of Linux operating systems to businesses said revenue increased 12% from the same quarter last year, while net income soared 37%.

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