By Liz Hoffman 

Mylan NV sued Kirkland & Ellis LLP over the law firm's role advising Teva Pharmaceutical Industries Ltd., which is in a bitter takeover battle with the drug maker.

Mylan said in a complaint, filed in Pennsylvania state court late Friday, that because Kirkland has represented the company in the past, it should be barred from working for Teva, which last month launched a $40 billion public bid that Mylan has rejected.

"We are confident in the propriety of our representation of Teva Pharmaceutical in this matter," Kirkland said in a statement. "We have a written conflicts-waiver letter, signed by Mylan, regarding the work we have done for Mylan. These filings are without merit, and are simply tactical measures designed to impede the proposed transaction."

According to the lawsuit, Mylan has had a relationship with Kirkland since January 2013, and the law firm has had "wide-ranging access to Mylan's business," including confidential information about its drug pipeline, pricing strategy and prospects for regulatory approval. The information allegedly includes details about Mylan's EpiPen allergic-reaction treatment, which Teva is now targeting with a competing product. Such information is typically considered valuable for a company pressing a takeover bid, helping it determine, for example, how much to offer and whether regulators will sign off.

Kirkland, one of the top mergers-and-acquisitions law firms, has handled many of Teva's biggest transactions, including its $6.8 billion takeover of Cephalon Inc. in 2011 and its acquisition of NuPathe Inc. last year.

Mylan rejected Teva's $82-a-share offer in unusually harsh terms on Monday, with Mylan Executive Chairman Robert Coury in a letter to Teva Chief Executive Erez Vigodman calling Teva a "poorly performing, troubled company." He also attacked Israel-based Teva's corporate culture and the value of its stock.

Mr. Vigodman responded by saying the letter "paints a fundamentally distorted picture of Teva."

Mylan, which is incorporated in the Netherlands, is simultaneously pursuing a roughly $36 billion bid for Perrigo Co. that has also been rejected.

Suing a former adviser in a takeover battle is a rare move. Airgas Inc. in 2010 sued Cravath, Swaine & Moore LLP for representing Air Products & Chemicals Inc., arguing that Cravath's previous relationship with Airgas should have prevented it from working on the potential deal. That case was eventually settled on confidential terms after Air Products abandoned its bid.

Cravath is now advising Mylan.

Write to Liz Hoffman at liz.hoffman@wsj.com

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