Benzinga's M&A Chatter for Wednesday August 21, 2013

The following are the M&A deals, rumors and chatter circulating on Wall Street for Wednesday August 21, 2013:

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Shares of Onyx Pharmaceuticals

surged higher after-hours on a report from

that the company has given potential buyers, including Amgen

, access to trial data. Talks between Onyx and Amgen reportedly hit a snag last week on a dispute over trial data about the blood cancer drug Kyprolis. Onyx Pharmaceuticals closed at $116.59 Wednesday, but rose above $120 per share in the after-hours session.

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IDEXX Laboratories

announced Wednesday that it has acquired all outstanding shares of Madasa do Brasil Ltda., a distributor of IDEXX Dairy and bovine testing products based in Sao Paulo, Brazil. All Madasa employees will join IDEXX and continue to operate in Sao Paulo. IDEXX Laboratories closed at $95.87 Wednesday, a loss of $0.64.

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Longbow Research initiated SodaStream

with a Buy rating on Wednesday, saying they believed "a future partnership with major soda makers or a full buyout seems likely within the next 36 months." In June, it was reported by

that PepsiCo

was in talks to buy SodaStream, but Pepsi CEO Indra Nooyi denied the rumor. SodaStream closed at $63.61 Wednesday, a loss of $0.35.

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Cenveo

announced Wednesday that will acquire substantially all of the operating assets of National Envelope for approximately $20 million in cash and $5 million in Cenveo common stock. In conjunction with Cenveo's agreement, Hilco Receivables will acquire substantially all the accounts receivable and Southern Paper will purchase the inventory of the Company. Cenveo closed at $2.73 Wednesday, a gain of almost 4%.