The RealMoney contributors are in the business of trading and investing all day on the basis of ongoing news flow. Below, we offer the top five ideas that RealMoney contributors posted today and how they played those ideas.

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Insider Buying

By Tim Melvin

12:13 p.m. EDT

A senior vice president bought 150,000 shares of

Seagate Technology

(STX) - Get Report

this week. I suggested this stock earlier this year and it has moved sharply off the lows.

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With the positive insider activity, I think I will continue to hold the stock for the long term. It has almost tripled off the lows, but is still about a third off its two-year highs. Data storage should be a great business when the economy recovers and I think there will be more mergers in this space.

Long Seagate.

Use Any Pullback to Pick Fertilizer Stocks

By Sham Gad

9:19 a.m. EDTThe fertilizer space has run up very quickly over the past two weeks. While the long-term fundamentals are very strong, short-term volatility could mean a chance to nibble at good prices.

Citigroup

(C) - Get Report

recently upped its ratings on the group, including

Potash

(POT)

,

Agrium

(AGU)

,

Mosaic

(MOS) - Get Report

, citing tighter grain supplies. Of greater significance is that the companies, namely Potash, have responded very quickly to cutting capacity, which has stabilized potash prices.

However, farmers

cannot

be without fertilizer for long and as they work through inventories, prices could jump nicely leading to a nice earnings surprise in 2010. We could easily see these companies test their 2008 highs in 2010, in which case the upside is over 100% from here in a year or two.

Long Potash.

Friday

By Timothy Collins

9:16 a.m. EDT

We are clearing out our

Goldman Sachs

(GS) - Get Report

long position this morning for a small profit. Heading into the long weekend, we are only taking our core strategy positions and, for better or worse, clearing our trading positions.

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However, we are not running in to buy here. I will let someone else be that guy. Today isn't the day for me to be a hero. Futures are slipping off pretty hard. I'd prefer to see a consolidation here so that Tuesday can give us a better look into the summer.

No positions.

Hedge Funds Buying REITs, Shorting Financials

By Larsen Kusick

9:07 a.m. EDT

Goldman came out with its hedge fund monitor yesterday, and I'm surprised to see that industrial REITs and diversified REITs are at the top of the list of subsectors that the hedgies were buying during the first quarter. The group is also heavily overweight in health care stocks, which I think is a promising sign since the sector has underperformed lately.

Looking at hedge funds' short positions, financials are (not surprisingly) the most heavily shorted sector.

Green Mountain Coffee Roasters

(GMCR)

,

Chiptole

(CMG) - Get Report

and

Synaptics

(SYNA) - Get Report

top the lists of individual stocks with huge short positions.

No positions

Missed Cougar? Look at Medivation

By Adam Feuerstein

7:28 a.m. EDT

The $900 million or so

Johnson & Johnson

(JNJ) - Get Report

is shelling out to buy

Cougar

( CGRB) highlights the good value to be had right now in

Medivation

(MDVN)

, which has both an Alzheimer's drug in phase III (in a partnership with

Pfizer

(PFE) - Get Report

and

a prostate cancer drug similar to Cougar's abiraterone moving soon into phase III studies.

And you get all that from Medivation for a market cap of $640 million.

Medivation owns 100% rights to its prostate cancer drug MDV3100 but is seeking a partner. Well, J&J just set a mighty high sales comp for phase III prostate cancer drugs.

Medivation is worth more.

No positions.

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This article was written by a staff member of RealMoney.com.