Markwest Energy Partners LP (NYSE:MWE) has been downgraded by analysts at Wells Fargo to a Market Perform rating form Outperform.

The firm lowered its price target range on the stock to $66-$70 from $70-$74.

In the pre-market session, shares of MWE are down 1.12% to $66.50, and move within a 52-week range of $54.60 – $75.79.

North American energy producer Encana Corporation (NYSE:ECA, ECA.TO) says its Encana Acquisition ULC subsidiary has begun a cash tender offer for all of the outstanding US$1 billion 5.80% notes due May 1, 2014 issued by Encana Holdings Finance Corp. Encana Acquisition will pay US$1,004.59 for each US$1,000 principal amount of the notes plus accrued and unpaid interest.

The tender offer expires at 10:00 a.m., New York City time, on March 28, unless extended.

State Street Corporation (NYSE:STT) has been downgraded by analysts at RBC Capital Markets to a Sector Perform rating form Outperform.

The firm also lowered its price target on the stock to $68 from $75 a share.

RBC Capital downgraded State Street (NYSE:STT) from Outperform to Sector Perform with a price target of $68.00 (from $75.00).

W.P. Carey (NYSE:WPC) said it has acquired Siemens’ new headquarters in Oslo, Norway, for $90 million. The acquisition is the company’s first in Norway, expanding its footprint to 21 countries.

Raytheon Company (NYSE:RTN) said it has received a $185 million modification from NASA on its current Joint Polar Satellite System Common Ground System (JPSS) contract.  JPSS is a polar-orbiting environmental satellite system that tracks storms and weather events and provides images that can show changes in the earth’s environment over time. Raytheon is the provider of the ground station acquiring the operational and scientific data from the program’s satellites.  The current contract is worth $1.7 billion, and the new modification adds capabilities, including improved operational and data availability, faster data delivery, automated mission management and information assurance.  The shares closed at $97.59 on Thursday and are unchanged pre-market.