Pops & Drops: Wells Fargo, Caterpillar

Following are the day's biggest winners and losers. Find out why shares of and popped while Caterpillar and dropped.

POPS (stocks that jumped higher)

Amazon.com (AMZN) popped 17%. The world’s largest online retailer pops this week after fourth-quarter profit and sales topped estimates, after its best holiday season ever. - Gross margins were lower, but operating margins were higher... they're running the business better, points out Guy Adami.

IShares FTSE/XINHUA China 25 Index ETF (FXI) popped 3%. The ETF that tracks the performance of the largest companies in China’s market rises this week as analysts see the yen gaining strength. - It will be the second week in a row that they'll have demand increases, says Tim Seymour.

General Dynamics (GD) popped 6%. The maker of tanks and Gulfstream jets pops after reporting fourth quarter earnings that beat expectations and reporting strong sales growth. - Good things happening here, good valuation, says Guy Adami.

Wells Fargo (WFC) popped 20%. The bank pops this week despite posting a loss as it maintains its dividend and says it doesn’t need more federal aid. - They've managed to take advantage of this good bank/bad bank situations a little, Pete Najarian points out.

DROPS (stocks that slid lower)

Caterpillar (CAT) dropped 13%. The global name in construction equipment slides as earnings miss estimates and its first quarter forecast is worse than expected. - The forecast was very, very disappointing, says Karen Finerman.

Pfizer (PFE) dropped 16%. The world’s largest drugmaker drops as investors look unfavorably on its $68 billion deal to acquire rival Wyeth. - Cutting the dividend? That's negative, says Pete Najarian.

A Drop for Super Bowl parties - Apparently Super Bowl bashes are the latest casualty of the economic crisis. The Playboy Blowout, usually the highlight even of the week, has been cancelled. Other cancelled parties include Sports Illustrated, Nike and Cadillac. Maxim will still be hosting its big bash, with host P Diddy, but is now scaling it down to about half as many guests.

SPDR S&P Homebuilders ETF (XHB) dropped 4%. The homebuilders drop following the Commerce Department report that sales of new homes in the U.S. fell to their lowest level on record, with a drop in purchases of 15%. - For homebuilders, that's not really a drop, says Karen Finerman.

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Trader disclosure: On Jan 30, 2009, the following stocks and commodities mentioned or intended to be mentioned on CNBC’s Fast Money were owned by the Fast Money traders; Najarian Owns (EEM), (BMY) Calls, (FCX) & (FCX) Short Calls, (MSFT) & (MSFT) Short Calls, (MS) & (MS) Short Calls/Put Spread, (SQNM) & (SQNM) Short Calls, (GDX) Call Spread, (GE) Put Spread, (STP) & (STP) Short Calls; Seymour Owns(AAPL), (BAC), (EEM), (F), (FXI); Finerman's Firm Is Short (IYR), Short (IJR), Short (IWM), Short (MDY), Short (SPY), Short (COF),Short (USO), Owns (DNA) & (DNA) Call Spread, Owns (MSFT), Owns (UNH); Adami Owns (AGU),(C),(BTU), (GS), (INTC),(MSFT),(NUE)

Montley Fool Owns Shares of (PG)

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