Other competitors in the energy sector include: Transocean (RIG), Hercules Offshore, Inc. (HERO), and ENSCO (ESV).

FORBES: Earnings Preview: Noble Corporation

Below is a three month price history chart comparing the stock performance of ESV, versus DVN and CVE.

FORBES: Shares of ESV Now Oversold

Below is a three month price history chart comparing the stock performance of HES, versus RRC and ESV.

FORBES: Hess Corp (HES) Shares Cross Below Book Value

Below is a three month price history chart comparing the stock performance of BP, versus CLR and ESV.

FORBES: BP Shares Enter Overbought Territory

Below is a three month price history chart comparing the stock performance of MVO, versus CLR and ESV.

FORBES: MVO Crosses Critical Technical Indicator

According to the ETF Finder at ETF Channel, ESV makes up 2.59% of the Oil Services ETF ( AMEX: OIH )which is trading lower by about 4% on the day Thursday.

FORBES: Ensco Stock Crowded With Sellers

According to the ETF Finder at ETF Channel, ESV makes up 4.29% of the Oil Services HOLDRS ETF ( AMEX: OIH) which is trading lower by about 1.8% on the day Tuesday.

FORBES: Shares of ESV Now Oversold

That portends a good year for Dallas-based Ensco International (nyse: ESV - news - people )--42 of its 53 rigs are jackups, making it the driller most levered to the trend.

FORBES: Rig Game