ATMI INC

CUSIP: 00207R101 Class: COM

WESTFIELD CAPITAL MANAGEMENT CO LP's Holding History (CIK: 0001177719)

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

Q3 2013
Shares 41,730 Value ($000) $1,107 Avg Close — Range —
Q2 2013
Shares 41,730 Value ($000) $987 Avg Close — Range —