X0306 4 2016-05-19 0000034067 DYNAMIC MATERIALS CORP BOOM 0001187002 CARIOU YVON PIERRE C/O DYNAMIC MATERIALS CORPORATION 5405 SPINE ROAD BOULDER CO 80301 1 0 0 0 Common Stock 2016-05-19 4 S 0 12500 10.1504 D 243767.14 D This price is a weighted average price. These shares were sold in multiple transactions at prices ranging from $10.15 to $10.16, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this Form 4. /s/ Teri Scott, as attorney-in-fact 2016-05-20