ATMI INC

CUSIP: 00207R101 Class: COM

PRICE T ROWE ASSOCIATES INC /MD/'s Holding History (CIK: 0000080255)

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

Q1 2014
Shares 1,225,222 Value ($000) $41,670 Avg Close — Range —
Q4 2013
Shares 1,229,322 Value ($000) $37,138 Avg Close — Range —
Q3 2013
Shares 1,233,262 Value ($000) $32,706 Avg Close — Range —
Q2 2013
Shares 1,186,140 Value ($000) $28,052 Avg Close — Range —