Last Week's Biggest Stock Movers

Plenty of stocks go up and down in any given week. The gainers inspire us to keep investing. The decliners keep greed in check while reminding us about the risks of the equity markets.

Let's go over some of last week's best and worst performers.

Wingstop (WING) -- Up 21 percent last week

Wall Street isn't chicken when it comes to the recently public Wingstop. At least a half-dozen analysts initiated coverage last week following the chicken wing chain's successful IPO a month earlier.

The stock's big pop -- shares have soared by more than 80 percent since it went public at $19 four weeks ago -- led half of the analysts to initiate neutral ratings, but Morgan Stanley, Jefferies and Robert W. Baird all sided with bullish calls on Wingstop.

Vipshop (VIPS) -- Up 12 percent last week

%VIRTUAL-WSSCourseInline-840%Chinese stocks swooned earlier in the week, leading Stifel analyst George Askew to upgrade some of the battered growth stocks. Vipshop -- a fast-growing group-buying website operator -- received a bullish nod from Askew, who pointed out that specializing in markdowns would serve it well if the Chinese economy starts to cool off.

There were plenty of Chinese stocks posting double-digit declines last week, but Vipshop came through as one of the few winners.

Build-A-Bear Workshop (BBW) -- Up 11 percent last week

The kid-friendly retailer of plush toys that are stuffed as shoppers customize them moved higher after eating some more of its cooking. Build-A-Bear Workshop announced a $10 million share buyback. This is the second stock repurchase that the chain has announced this year. It approved a similar $10 million buyback in February, and now it's nearly completed that one.

Build-A-Bear also moved higher on Friday after announcing the launch of Honey Girls, the chain's first line of multimedia plush toys. However, most of the gain came earlier in the week on the stock repurchase news.

Chemours (CC) -- Down 29 percent last week

The New York Stock Exchange's biggest loser last week was one of the bigger winners the week before. Chemours initially took off after being spun off by DuPont (DD) two weeks ago, but sentiment turned after investors started paying attention to bearish analysts who feared that the spinoff was overvalued and that there was a risk of expanded environmental fines for the provider of titanium technologies, fluoroproducts, and chemical solutions.

Barracuda Networks (CUDA) -- Down 20 percent last week

It's probably fitting that Barracuda Networks gets bit just ahead of Shark Week, but the security technology specialist probably had it coming. Barracuda posted mixed quarterly results. Revenue climbed 18 percent since the prior year, ahead of expectations. However, billings -- an important metric for gauging near-term performance -- fell short. Barracuda also offered up guidance for the current quarter that fell short of forecasts.

Zillow (Z) -- Down 10 percent last week

The fast-growing real estate website operator slumped after its CFO resigned. Chad Cohen will be leaving the company next month. Cohen had been with the company for nearly a decade, serving as CFO since 2011.

Investors don't like when longtime CFOs step down, and things get complicated here because Zillow completed its acquisition of smaller rival Trulia earlier this year. This doesn't suggest that there's anything funky with Zillow's accounting, but investors seek consistency with its top bean counter at a time when the bookkeeping could get complicated.

Motley Fool contributor Rick Munarriz has no position in any stocks mentioned. The Motley Fool recommends and owns shares of Zillow Group. Try any of our Foolish newsletter services free for 30 days. Check out our free report on one great stock to buy for 2015 and beyond.