AMPHASTAR PHARMACEUTICALS IN

Ticker: AMPH CUSIP: 03209R103 Class: Common Stock

DRIEHAUS CAPITAL MANAGEMENT LLC's Holding History (CIK: 0000938206)

Note: Option positions (PUT/CALL) are excluded.

Q4 2018

Shares 57,300 Value ($000) $1,140 Avg Close $19.71 Range $17.71 - $22.74

Q4 2017

Shares 11,902 Value ($000) $229 Avg Close $18.67 Range $17.00 - $19.95

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2018	57,300	$1,140	$19.71	$17.71 - $22.74
Q4 2017	11,902	$229	$18.67	$17.00 - $19.95