Kromek 's COO, Barry Beumer, buys 80,000 shares Share Facebook Twitter Google+ LinkedIn Telegram Print Download PDF version 12:20 29 Mar 2017 The purchase gives him a 0.03% stake in the company. Kromek's technology is used in the medical, security and nuclear markets Berry Beumer, chief operating officer of Kromek Group PLC (LON:KMK) has bought 80,000 shares in the radiation technology specialist. Beumer bought the shares at 29.35p each. The purchase gives him a 0.03% stake in the company. Shares in Kromek rose 3.8% to 27.5p on the news.