The Nasdaq 100, a tech-heavy index, finished last week up 1.89% to close at 1,924.43. Techs are rallying at a notable time: Wednesday marked the 10-year anniversary of the bursting of the dot-com bubble.

Pops and drops
Here's a closer look at the index's top movers, both to the upside and downside. Returns are calculated from the Nasdaq 100's closing price on Friday, March 5.

Last week's winners:

Company

Percentage Gain

CAPS Stars (out of 5)

Citrix Systems (Nasdaq: CTXS)

7.78%

***

Research In Motion (Nasdaq: RIMM)

7.35%

**

Hologic

7.06%

****

First Solar (Nasdaq: FSLR)

6.36%

**

Baidu (Nasdaq: BIDU)

5.66%

**

Sources: Capital IQ (a division of Standard & Poor's), Motley Fool CAPS, and Yahoo! Finance.

Last week's losers:

Company

Percentage Loss

CAPS Stars (out of 5)

Warner Chilcott

6.41%

**

Expedia (Nasdaq: EXPE)

3.96%

**

Seagate Technology

3.26%

***

News Corp. (Nasdaq: NWS)

2.77%

***

KLA-Tencor

2.77%

***

Sources: Capital IQ, Motley Fool CAPS, and Yahoo! Finance.

A weekly tour of tech
The week's top stock, Citrix Systems, appears to have benefited from enthusiasm for what media reports say is a big upgrade to its XenApp software. The company introduced version 6 last week.

XenApp transforms common Windows software programs into cloud-computing applications. Companies use XenApp to hand off the job of installing and upgrading needed business software to a data-center operator. Microsoft (Nasdaq: MSFT) is an ally and partner in the effort.

Research In Motion realized most of its gains last Monday, when BMO Capital Markets upgraded the stock to "outperform" from "market perform," Dow Jones reported. Analyst Tim Long said there's evidence the company will raise guidance when it next reports earnings on March 31. Perhaps it's time I reconsider my decision to short the BlackBerry builder?

Finally, while it's not clear precisely what caused investors to sour on Expedia's shares, the airlines probably didn't help. Carriers flew fewer passengers in 2009 than they had at any time since 2004, according to the Department of Transportation. Fewer travelers could make for more competition for booking fees, the bread and butter of Expedia's business.

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