6. Equity awards

As of March 31, 2016, the Company had two stock-based employee compensation plans, the Third Amended and Restated Emergent BioSolutions Inc. 2006 Stock Incentive Plan (the "2006 Plan") and the Emergent BioSolutions Employee Stock Option Plan (the "2004 Plan"). The Company refers to both plans together as the "Emergent Plans".

The following is a summary of stock option award activity under the Emergent Plans:

	2006 Plan					2004 Plan
	Number of Shares			Weighted-Average Exercise Price		Number of Shares			Weighted-Average Exercise Price		Aggregate Intrinsic Value
Outstanding at December 31, 2015		2,964,237		$	22.73		29,699		$	10.28	$	52,119,607
Granted		391,158		$	33.83		-		$	-
Exercised		(178,124	)	$	18.47		(29,699	)	$	10.28
Forfeited		(12,742	)	$	25.48		-		$	-
Outstanding at March 31, 2016		3,164,529		$	24.33		-		$	-	$	38,049,150
Exercisable at March 31, 2016		1,951,044		$	21.12		-		$	-	$	29,719,065

The following is a summary of restricted stock unit award activity under the 2006 Plan:

	Number of Shares			Weighted-Average Grant Price		Aggregate Intrinsic Value
Outstanding at December 31, 2015		889,004		$	26.86	$	35,569,048
Granted		427,592		$	33.83
Vested		(353,117	)	$	24.70
Forfeited		(9,599	)	$	30.06
Outstanding at March 31, 2016		953,880		$	30.75	$	34,673,539