Rex Energy Corp shares are currently trading down about 0.1% on the day.

FORBES: Shares of REXX Now Oversold

Rex Energy Corp shares are currently trading down about 1.1% on the day.

FORBES: Grab Shares of REXX Cheaper Than the CFO Did

Rex Energy Corp shares are currently trading up about 0.6% on the day.

FORBES: REXX Makes Bullish Cross Above Critical Moving Average

Rex Energy Corp shares are currently trading down about 5.7% on the day.

FORBES: Bearish Two Hundred Day Moving Average Cross - REXX

Other buyout candidates include Southwestern Energy, Range Resources, Rex Energy and Stone Energy.

FORBES: Shell Brushes Off Alaska Setback With $5B Marcellus Buy

Other competitors in the energy sector include: EV Energy Partners, L.P. (EVEP), New Concept Energy (GBR), and Rex Energy Corporation (REXX).

FORBES: Earnings Preview: Range Resources

The debate should be over anyway, say both state regulators and the drilling company Rex Energy, because multiple independent reviews found no contamination from drilling at all.

NPR: Cause Of Off-Color, Fetid Water Eludes Pa. Town

Among the largest underlying components of XOP, in trading today Rex Energy Corp ( NASD: REXX) is up about 1.4%, Halcon Resources Corp ( NYSE: HK) is up about 1.3%, and Energen Corp. ( NYSE: EGN) is up by about 0.4%.

FORBES: XOP, REXX, HK, EGN: ETF Inflow Alert

Among the largest underlying components of XOP, in trading today Rex Energy Corp ( NASD: REXX) is up about 0.2%, Comstock Resources, Inc. ( NYSE: CRK) is down about 0.9%, and Laredo Petroleum Holdings Inc ( NYSE: LPI) is lower by about 0.3%.

FORBES: SPDR S&P Oil & Gas Exploration & Production ETF Experiences Big Inflow

"In each case, the scientific analysis concluded that neither Rex Energy's operations nor natural gas development impacted water quality, " said Rex spokesman Derek Smith, who noted that the company provided access to records, shared data, and gave "its complete cooperation and support" to the reviews.

NPR: Cause Of Off-Color, Fetid Water Eludes Pa. Town