why sell 15% stake for next to 0, page-4

They haven't sold it for nothing, they have sold it for 120M shares in MOG out of a total of 200M (in other words 60% of the company). It would appear they have done this to expose them to the market, as it was held by a private company previously. I think the same owners (Albers) are behind all of the companies involved. The 120M shares that Gascorp will have in MOG will start to reflect the value of the 15% stake in Artemis. Hence the reasoning behind this run continuing.