For the third straight month, oil and gas company Unit Corp. is the favorite stock among the nearly 29,000 rated investors participating in Motley Fool CAPS, the Fool's free investing-intelligence community.

It's been a good year for Unit Corp. Since first making the top-10 list in January, Unit's stock price is up 25% and it received a nod from the folks at Motley Fool Stock Advisor in March.

While Motley Fool Hidden Gems choice Mueller Water has maintained its position as the second-favorite stock on CAPS, we do find some new faces on this week's list:

Company

Market Cap (in millions)

Unit Corp.

$2,635

Mueller Water

$1,815

OMNI Energy Services (NASDAQ:OMNI)

$177

Leucadia National (NYSE:LUK)

$7,316

Huaneng Power International (NYSE:HNP)

$13,605

Helix Energy Solutions (NYSE:HLX)

$3,358

Canadian Natural Resources (NYSE:CNQ)

$34,340

AAR (NYSE:AIR)

$1,231

Universal Stainless & Alloy Products

$299

Chicago Bridge & Iron (NYSE:CBI)

$3,712
Data provided by Capital IQ, a division of Standard & Poor's.

As always, none of the companies on this list should be considered formal recommendations, but rather starting points for further research.

Neither a road nor an island
Chicago Bridge & Iron caught my attention this month, partly because its name is somewhat misleading. The company was indeed founded in Chicago in 1889 as a bridge and iron specialist, but it quickly turned its focus to designing and engineering liquid storage systems -- for oil, gas, water, and so on -- and has continued that focus for nearly a century. Today, it's headquartered in the Netherlands.

As you might imagine, there's a growing demand for its services around the world. In fact, CBI has grown its revenue at nearly 25% per annum over the past five years. Moreover, the company carries zero long-term debt and holds $683 million in cash on its balance sheet. All things considered, CAPS investors are right to have high expectations for this stock. It appears well positioned for market-beating growth.  

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Todd Wenning wonders whether they serve deep-dish pizza in Holland. He does not own shares of any company mentioned. The Fool has a disclosure policy.