Glaxo Bulls Awaken With Calls as Pfizer Merger Chatter Escalates

Photographer: Matthew Lloyd/Bloomberg
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Options traders are getting busy with a U.K. stock they have rarely paid attention to.

Volume in GlaxoSmithKline Plc contracts surged to the highest level since 2007 this month, with traders paying record prices for bullish options relative to bearish ones. All that after the stock lost $11 billion in value over two months.