Shares in Newmark Security rose more than 6% as the company announced its subsidiary Safetell inked a new £2.5m contract.At 13.00 on Monday shares in the security firm were up 6.37% to 3.22p.UK-based Newmark said the name of the company it contracted with was a secret, but the firm had a turnover of £4bn.The contract was for four years and would involve maintenance and support of security products on a national basis, Newmark said.