NEW YORK ( TheStreet) -- Duncan Energy Partners ( DEP), Chesapeake Energy ( CHK) and SandRidge Energy ( SD) were the top gainers, while Seacor Holdings ( CKH), JA Solar Holdings ( JASO), and ReneSola ( SOL) headed the losers' list last week.

Duncan Energy Partners gained 24.5%, topping energy gainers, after Enterprise Products Partners ( EPD) made an offer to acquire the company. Enterprise offered 0.9545 shares for each Duncan share, representing a 30% premium based on Feb. 18 closing price. Citigroup upgraded Duncan Energy to buy from hold, while RBC capital downgraded the stock to sector perform from outperform.

Chesapeake Energy rose 16% on multiple events that happened during the week. BHP Billiton ( BHP) agreed to buy the company's Arkansas shale gas assets for $4.75 in cash that will help Chesapeake reduce its debt. Additionally, Chesapeake reported robust 2010 fourth quarter earnings per share at 70 cents ahead of analysts' estimates of 64 cents.

Later in the week, Citigroup raised its target price for the stock to $35 from $28, maintaining hold rating. The bank estimates Chesapeake's 2011 EPS at $2.97 vs. consensus $2.70 and 2012 EPS at $3.64 vs. consensus $2.70. Meanwhile, BMO capital raised its target to $39 from $30, reflecting the company's increased production of oil and liquids. Separately, Oppenheimer raised its target to $40 from $28, maintaining outperform rating, on attractive valuation compared with its peers. Lastly, Canaccord Genuity upgraded the stock to buy from hold.

SandRidge Energy surged 13.5%, after reporting 2010 fourth quarter adjusted earnings per share at 7 cents vs. consensus loss of 8 cents per share. During the week, the company signed an agreement to sell certain New Mexico properties for $200 million.

Cabot Oil & Gas ( COG) rose 12.3% last week, after reporting stronger-than-expected 2010 fourth quarter revenue at $216.9 million vs. estimates of $212.4 million. UBS raised its target price for the stock to $44 from $38, while maintaining its neutral rating, after Cabot Oil & Gas issued production growth guidance of 33% for 2011, in comparison to bank's estimate of 25%.

Wells Fargo upgraded its valuation range on Cabot Oil & Gas to $52-$53 from $47-$50, while maintaining an outperform rating. The bank raised its 2011 EPS estimate to 89 cents from 40 cents. Meanwhile, Tudor Pickering upgraded the stock to buy from accumulate. Raymond James upgraded the stock to market perform from underperform.

Cie Generale de Geophysique - Veritas ( CGV) advanced 11.9% last week, after reporting 2010 fourth quarter revenue at $905 million vs. consensus $729.2 million.

Range Resources ( RRC) gained 11.5% during the week, after the company issued upbeat operations update. The company said that production volume for the fourth quarter jumped 18% from the year-ago period. Capital One Southcoast upgraded the stock to add from neutral, citing the company's positive operations update.

Continental Resources ( CLR) added 9.3% after reporting 2010 fourth quarter adjusted earnings per share at 51 cents vs. estimates of 49 cents.

Brigham Exploration ( BEXP) gained 8.9% during the week, after reporting 2010 fourth quarter adjusted earnings per share at 21 cents vs. consensus 19 cents. Average daily production during the quarter was 11,384 barrel of oil equivalent (BOE), which is expected to remain in the range of 11,300-12,000 BOE/day during 2011 first quarter. For full-year 2011, the management guided production in the range of 14,000-16,000 BOE/day.

Similarly, SM Energy ( SM) rose 8.9% after reporting 2010 fourth quarter earnings per share at 57 cents vs. estimates of 30 cents.

Southwestern Energy ( SWN) advanced 7.4% during the week. For the 2010 fourth quarter, the company reported earnings per share at 43 cents vs. estimates of 42 cents, while sales came in at $670.4 million vs. consensus $497.9 million.

MOL Hungarian Oil and Gas jumped 6.7% last week. Concorde Securities raised its rating on MOL to overweight, while Morgan Stanley raised its price target.

Key Energy Services ( KEG) added 6.4% after UBS raised its target price for the stock to $16 from $14, maintaining buy rating. The bank increased its EPS estimates to 62 cents from 61 cents for 2011, and to 70 cents from 68 cents for 2012.

Other movers were Rosetta Resources ( ROSE), Sasol ( SSL), Berry Petroleum ( BRY) and Noble ( NE), up 8.4%, 8.0%, 7.9% and 6.9%, respectively.

Among oil giants, Chevron ( CVX) jumped 5.1% after Valero Energy ( VLO) is said to be in talks to buy Chevron's U.K. refinery. Meanwhile, Petroleo Brasileiro (Petrobras) ( PBR), Apache ( APA), and ConocoPhillips ( COP) gained 5.7%, 2.4%, and 2.3%, respectively.

Seacor Holdings was the top loser for the second consecutive week, plunging around 14.5%. JA Solar fell 10.4%, despite reporting stronger-than-expected 2010 fourth quarter revenue at $584.3 million vs. consensus $570.9 million.

Similarly First Solar International ( FSLR) declined 8.8% during the week. For the 2010 fourth quarter, the company reported earnings per share at $1.80 vs. estimates of $1.74, while sales came in at $609.8 million vs. consensus $646.8 million. For 2011, the company expects net sales in the range of $3.7 billion-$3.8 billion vs. estimates of $3.76 billion and earnings per share in the range of $9.25-$9.75 vs. consensus $9.10.

Susquehanna increased its price target on First Solar to $190 from $180 on the company's fourth-quarter results citing improved revenue mix. RBC Capital raised its price target on the stock to $190 from $160 on expectations that the company will likely generate higher than expected margins and production. Meanwhile, UBS cut its rating to neutral from buy.

Other solar stocks ReneSola ( SOL), Yingli Green Energy Holdings ( YGE), GT Solar International ( SOLR), LDK Solar ( LDK), Trina Solar ( TSL) and Suntech Power Holdings ( STP) declined around 9.3%, 3.7%, 3.6%, 1.9%, 1.8%, and 1.5%, respectively.

Exterran Holdings ( EXH) dipped 7.3% during the week, after 2010 fourth quarter losses widened to 51 cents per share from analysts' estimates of 34 cents.

Ultra Petroleum ( UPL) dropped 5.8% after Global Hunter Securities cut the stock to accumulate from buy. Meanwhile, UBS lowered its target price to $49 from $51, maintaining neutral rating, and lowered 2011 EPS to $2.65 from $2.70 vs. consensus estimates of $2.93 per share.

Among others, Chesapeake Midstream Partners ( CHKM), Forest Oil ( FST), Weatherford International ( WFT) and Tesoro ( TSO) dipped 9.1%, 8.9%, 8.1% and 6.4%, respectively.

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