The Ira Sohn conference -- one of the most closely-watched investor conferences of the year -- kicks off Monday afternoon.

Some of the biggest names in the hedge-fund world -- Greenlight Capital's David Einhorn, Omega Advisors' Leon Cooperman, Pershing Square Capital Management's William Ackman, and many more -- will take the stage to deliver a mix of stock picks, companies they're betting against, and macro investment ideas. All of this is for the benefit of the Ira Sohn foundation, which finances initiatives to cure and treat pediatric cancer.

Stock prices will rise and fall as these investors state their opinions. MoneyBeat will bring you all the presentations live from Lincoln Center.

12:28 pm | Not just Pioneer | by Juliet Chung

Concho, Continenal Resources are other companies he compares to Pioneer. And he's out.

12:27 pm | Long oil | by Juliet Chung

Pioneer is "dramatically overvalued," Einhorn says. "Many people are buying frackers because they want to bet on higher oil prices." But there's a simpler way, he says: buy oil.

12:25 pm | Details | by Juliet Chung

The company's stock is basically an option play, he says, something faster drilling won't help. (His firm, Greenlight Capital, will post more details on its website later.)

12:24 pm | Sell-side | by Juliet Chung

Fracking analysts are guilty of taking this bullish view too, he says.

12:23 pm | Well-conomics | by Juliet Chung

Now he's talking about where Pioneer spends its capex--horizontal drilling, but also a bunch of other stuff. He's saying Pioneer and others are "cherrypicking" by drilling their best areas first. But "the problem with exploiting your best prospects are you are left with your other prospects."

12:22 pm | Transparency | by Juliet Chung

Pioneer ought to stop touting estimates based on stale pricing, he says.

12:21 pm | Lower oil | by Juliet Chung

If oil is $95, Pioneer would be worth $41 per share, the company said in a filing Einhorn references. But if oil drops big, even taking into account 20% cuts in key areas, its shares would be worth significantly less.

12:19 pm | Stock taking a hit | by David Benoit

Pioneer's stock is dropping as Einhorn talks. Down 3.2% to $166 and bouncing around as he goes on.

12:18 pm | If oil goes up.. | by Juliet Chung

What happens with Pioneer when oil prices rise? "Pioneer earns a positive margin, but it's not a positive value," he says.

12:14 pm | Pioneer | by Juliet Chung

Now he's talking about Pioneer Natural Resources, which owns up in the Permian Basin and is a big shale producer--a "mother fracker," he says.

12:13 pm | Shale | by Juliet Chung

He says investors should continue looking at traditional metrics that get ignored in fracking: capex and depletion. "A business that burns cash and doesn't grow isn't worth anything." He clarifies he's talking about shale frackers, not nat gas frackers

12:11 pm | Poof | by Juliet Chung

"Investing for growth is a fiction" in this sector, he says. "Here the capex goes toward reducing the assets one barrel at a time. Once you extract a barrel of oil from the ground, that's it, poof, it's gone."

12:10 pm | Cash burn | by Juliet Chung

Frackers should have been awash in cash as the price of oil rose, he said, but instead they spent more. "Higher oil price led to even greater cash burn." Last year, he says, "the group burned $20 billion."

12:09 pm | Fracking | by Juliet Chung

He says the banks are incentivized to finance the "frack addicts" and quotes a billionaire investor, who said that if you give a driller money, they'll drill a hole.

12:08 pm | Fracking | by Juliet Chung

"The best results come from combining fracking with horizontal drilling," he says. Frackers have found success in Bakken, the Permian and Eagle Ford. But "fracking is expensive, buying the land, setting up infrastructure and drilling the holes takes money, lots and lost of money. So the frackers took their story to Wall Street."

12:07 pm | Einhorn at Bat | by Juliet Chung

Investment in fracking companies will "contaminate" investment returns, Einhorn says. "Over the last few years they've led a production boom that has helped make our country energy independent."

12:05 pm | Einhorn at Bat | by Juliet Chung

Some energy companies have "negative development economics," he says, that they don't earn a positive return on capital outside "a few choice" areas--"meet the focker--frackers," he says

12:04 pm | Parallels | by Juliet Chung

He wants to draw parallels between St. Joe, the Florida-based real estate company he publicly announced a short on, and his idea today.

12:03 pm | Einhorn at Bat | by Juliet Chung

Einhorn takes the podium. Doubtless there are more than a few management teams that will breathe a sigh of relief when his time's up and he hasn't taken aim at their companies.

12:03 pm | Einhorn Track Record | by Maureen Farrell

The Sohn conference will kick off with David Einhorn's presentation. There's a good chance he'll share a new short bet on a stock. In a recent investor letter he said he's added more short positions to his portfolio.

This time last year, he outlined why he thought that athenahealth, Inc.'s stock could "easily fall 80% or more." Shares in the company, which is a technology company that helps doctors and hospitals with billings and record keeping, fell immediately after Mr. Einhorn delivered his presentation. But it's rebounded somewhat since, and sits far above where he predicted.

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