Pops & Drops: AMR, OptionsXpress...

Following are moves you might have missed. Find out why shares of AMR and OptionsXpress popped while American Tower dropped.

POPS (stocks that jumped higher)

AMR Corp. (AMR) popped 3%. A Morgan Stanley analyst made positive comments about American as well as rivals Delta and US Airways. - I'd stay away, says Steve Cortes.

OptionsXpress (OXPS) popped 16%. Charles Schwab said it would buy the company for $1 billion, a 17% premium to Friday’s close. - If you're long take profits, says Brian Kelly.

Potash (POT) popped 3%. Goldman Sachs upgraded the stock to ‘Buy’ from ‘Neutral’ with a $58 price target citing its “strong leverage to the nutrient potash.” - I agree, says Tim Seymour.

Tiffany (TIF) popped 5%. The company reported better-than-expected fourth-quarter profit and its forecasts topped expectations despite the negative impact of the Japan quake. - I'm a buyer, says Guy Adami.

Archer Daniels (ADM) popped 3%. Investors were cheered by word the company had hired an industry veteran in the newly created role of chief operating officer. - That suggests they have a succession plan in place, says Stephen Weiss.

DROPS (stocks that slid lower)

American Tower (AMT) dropped 8%. Raymond James downgraded the stock to outperform from strong buy, on the wake of the AT&T / T-Mobile merger. Analysts say the deal could effectively eliminate an additional "4G" wireless network from being built, and as a result slow the demand for towers. - I think this is very bad news for American Tower, says Steve Cortes.

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Trader disclosure: On March 21, 2011, the following stocks and commodities mentioned or intended to be mentioned on CNBC’s "Fast Money" were owned by the "Fast Money" traders; Guy Adami is long (AGU); Guy Adami is long (C); Guy Adami is long (GS); Guy Adami is long (MSFT); Guy Adami is long (NUE); Guy Adami is long (INTC); Guy Adami is long (BTU); Steve Cortes is long (TM); Steve Cortes is long (GS); Steve Cortes is long (CSX); Steve Cortes is long (SDY); Steve Cortes is long (SO); Steve Cortes is long (S); Steve Cortes is long Crude Oil; Steve Cortes is short (F); Steve Cortes is short (C); Steve Cortes is short (UNP); Steve Cortes is short (SPY); Steve Cortes is short (DBA); Steve Cortes is short Wheat; Steve Cortes is short Soybeans; Steve Cortes is short AUD/USD; Steve Cortes is short CAD/USD; Steve Cortes is short EUR/USD; Tim Seymour is long (T); Tim Seymour is long (CCJ); Tim Seymour's firm is long (POT); Stephen Weiss is long (MSFT); Stephen Weiss is long (VZ); Stephen Weiss is long (QCOM); Stephen Weiss is long (CF); Stephen Weiss is long (JPM); Stephen Weiss is long (FAS); Stephen Weiss is long (HBAN); Stephen Weiss is long (HPQ); Stephen Weiss is long (MEE); Stephen Weiss is long (CNX); Stephen Weiss is long (DVN); Stephen Weiss is long (COP); Stephen Weiss is long (HK)

For Brian Kelly
Accounts managed by Kanundrum Capital Are Long (GLD)
Accounts managed by Kanundrum Capital Are Long (SLV)
Accounts managed by Kanundrum Capital Are Long (TLT)
Accounts managed by Kanundrum Capital Are Long (DBA)
Accounts managed by Kanundrum Capital Are Long Gold
Accounts managed by Kanundrum Capital Are Long Silver
Accounts managed by Kanundrum Capital Are Long U.S. Bonds
Accounts managed by Kanundrum Capital Are Short (XLF)
Accounts managed by Kanundrum Capital Are Short Copper
Accounts managed by Kanundrum Capital Are Short (IXG)
Accounts managed by Kanundrum Capital Are Short (LOW)
Accounts managed by Kanundrum Capital Are Short (FCX)

For Mike Khouw
Cantor Fitzgerald & Co. Is A Market Maker In (S)

For Michael Worms
No Disclosures

For Jeff DeGraaf
No Disclosures

For William Power
No Disclosures

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Comcast Is The Parent Company Of NBCUniversal
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GE Owns 49% Of CNBC