Discovery Group I, Llc

Insider Trading: Purchases
Company Symbol Price Amount Relationship Remaining Holdings Date Form 4
ATRC $11.49 800 Large Shareholder 1,612,156 2011-04-05 Filing
ATRC $11.50 1,768 Large Shareholder 1,611,356 2011-04-04 Filing
ATRC $10.98 900 Large Shareholder 1,609,588 2011-03-28 Filing
ATRC $11.00 1,100 Large Shareholder 1,608,688 2011-03-25 Filing
ATRC $10.99 5,247 Large Shareholder 1,607,588 2011-03-24 Filing
ATRC $10.72 2,800 Large Shareholder 1,602,341 2011-03-23 Filing
ATRC $10.72 3,200 Large Shareholder 1,599,541 2011-03-22 Filing
ATRC $9.73 4,942 Large Shareholder 1,585,999 2011-03-16 Filing
ATRC $9.69 987 Large Shareholder 267,768 2011-03-15 Filing
ATRC $9.69 6,065 Large Shareholder 1,581,057 2011-03-15 Filing
ATRC $9.55 100 Large Shareholder 1,574,992 2011-03-14 Filing
ATRC $10.63 1,200 Large Shareholder 1,596,341 2011-03-21 Filing
ATRC $10.11 2,413 Large Shareholder 1,595,141 2011-03-18 Filing
ATRC $9.90 1,095 Large Shareholder 268,863 2011-03-17 Filing
ATRC $9.90 6,729 Large Shareholder 1,592,728 2011-03-17 Filing
ATRC $9.73 4,942 Large Shareholder 1,585,999 2010-03-16 Filing
ATRC $9.69 987 Large Shareholder 367,768 2011-03-15 Filing
ATRC $9.69 6,065 Large Shareholder 1,581,057 2011-03-15 Filing
ATRC $9.55 100 Large Shareholder 1,574,992 2011-03-14 Filing
ATRC $9.65 700 Large Shareholder 266,781 2011-03-11 Filing