Benzinga's M&A Chatter for Tuesday April 21, 2015

The following are the M&A deals, rumors and chatter circulating on Wall Street for Tuesday April 21, 2015:

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Teva Pharmaceutical Industries

announced Tuesday, it has proposed to acquire all of the outstanding shares of Mylan N.V.

in a transaction valued at $82.00 per Mylan share, comprised of approximately 50% cash and 50% Teva stock. The deal was contingent on Mylan not completing its proposed acquisition of Perrigo Company plc, announced on April 8. Late Tuesday,

reported that top Mylan investors, including Pauslon & Co were pressing for Mylan's Board to consider the Teva proposal. Separately, Perrigo's Board of Directors unanimously rejected the $205.00 per share offer from Mylan, indicating that it substantially undervalues the company and is not in the best interests of shareholders. Mylan shares gained 9% Tuesday, closing at $74.07. Teva shares gained more than 1%, closing at $64.16. Perrigo shares lost 2.5% to close at $192.82

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Shares of Anadarko Petroleum Corporation

rose early on Tuesday, on unconfirmed market chatter of potential bid from Exxon Mobil Corporation

. The price being mentioned was $120 per share, according to sources. Last Friday,

reported that Anadarko was considering selling its stake in its Mozambique gas assets, with Exxon Mobil the potential buyer. Spokespersons for Anadarko and Exxon did not respond to requests for comment. Anadarko Petroleum shares lost 1% Tuesday, closing at $92.56.

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Shares of Gilead Sciences Inc.

rose sharply early Tuesday and continued strong throughout the day, on unconfirmed market chatter of a potential $2 billion stake by activist investor Bill Ackman. That rumor followed a Bernstein note saying that Gilead should pursue the acquisition of Vertex Pharmaceuticals Incorporated

. Spokespersons for Gilead and Vertex were not available for comment. Gilead shares rose 4.5% Tuesday, closing at $105.20. Vertex gained more than 5% to close at $132.20.

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Shares of Pennsylvania Real Estate Investment Trust

spiked higher Tuesday, following a

story that the REIT could be the next target for Simon Property Group

, according to sources. Simon failed last month in a $95.50 per share bid for The Macerich Company

. A Simon spokesperson told

the company has no interest in acquiring Penn REIT. A spokesperson for Penn REIT declined comment. Pennsylvania Real Estate Investment Trust

gained 3.65% Tuesday, closing at $22.16.