The FTSE AIM All-Share opened at 769.81 points on Monday but immediately lost ground as concerns about European sovereign debt continued to dominate investor sentiment. Probability (LON:PBTY) , the mobile gambling operator, was the top riser on AIM on Monday after the company confirmed that it was in talks over a possible takeover by William Hill (LON:WMH). Shares in the company had risen by nearly 50% to 73p by mid-morning.

Elsewhere, Image Scan (LON:IGE), a company that makes x-ray imaging systems for security markets, saw its stock gain 21% to 2.125p on news of a £1.46 million contract win. CEO Louise George said the latest deal, together with a recent steady flow of smaller contracts, reflected ongoing investment in sales over recent years. Other risers included Platmin (LON:PPN), the platinum group metals producer, which was up 12% to 31p, and oil and gas group Global Petroleum (LON:GBP), which was up 19% to 16.5p after announcing that it had begun seismic survey work over its prospective acreage offshore Namibia. Ultrasis (LON:ULT), the company behind a treatment programme to combat mild depression, was up 8% to 0.74p in response to a new joint venture with health insurers in the Netherlands.

Nostra Terra (LON:NTOG) saw its shares fall the furthest during the morning as investors responded negatively to test production figures from the company’s Agnello #1 horizontal well on the Vintage Hills prospect in Texas, US. Nostra Terra said it was now on the look-out for additional acreage in order to boost revenues. Shares in the company fell by 20% to 0.54p. Meanwhile, Nighthawk Energy (LON:HAWK), another oil and gas group involved in US projects, endured a 15% share decline to 4p. The company’s full-year results confirmed falling revenues and losses totalling $28.4 million following a substantial reorganisation of its assets. Other losers today included fashion brand Hot Tuna (LON:HTT), down 10% to 0.08p, and PR group Adventis (LON:ATG), which saw its shares fall 10% to 2.25p in response to a decision to…

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