AMPHASTAR PHARMACEUTICALS IN

Ticker: AMPH CUSIP: 03209R103 Class: Common Stock

Alyeska Investment Group, L.P.'s Holding History (CIK: 0001453072)

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

Q2 2015

Shares 173,062 Value ($000) $3,042 Avg Close $15.59 Range $13.55 - $18.25

Q1 2015

Shares 160,406 Value ($000) $2,400 Avg Close $13.37 Range $11.12 - $15.79

Q4 2014

Shares 116,188 Value ($000) $1,349 Avg Close $10.89 Range $9.76 - $12.46

Q3 2014

Shares 98,974 Value ($000) $1,153 Avg Close $10.42 Range $8.32 - $12.52

Q2 2014

Shares 100,000 Value ($000) $1,001 Avg Close $9.82 Range $6.67 - $11.07

Period	Shares	Value ($000)	Average Close	Price Range
Q2 2015	173,062	$3,042	$15.59	$13.55 - $18.25
Q1 2015	160,406	$2,400	$13.37	$11.12 - $15.79
Q4 2014	116,188	$1,349	$10.89	$9.76 - $12.46
Q3 2014	98,974	$1,153	$10.42	$8.32 - $12.52
Q2 2014	100,000	$1,001	$9.82	$6.67 - $11.07