Human Genome Sciences (NASDAQ: HGSI) has garnered quite a bit of attention in the options pits lately, as investors place their bets amid talk of a possible buyout by GlaxoSmithKline Plc (NYSE: GSK).

On Tuesday, the biopharmaceutical issue saw roughly 11,700 puts change hands, nearly tripling its average daily volume of fewer than 4,400. On the other side of the Street, the security saw about 48,500 calls cross the tape, more than quadrupling its average single-session volume of roughly 11,300 contracts. Digging deeper into the data, it appears that at least one investor is anticipating a moderate move higher by initiating a ratio vertical spread with calls.

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