If you'd invested in: Stobart Group and Imagination Technologies

If only...

Stobart Group () began life as a Cumbrian road haulage company, but now operates infrastructure and support services in the energy, aviation and rail sectors. It recently hived off its trucking division in a £550mflotation. The firm's turnover increased by £10m last year to £126.7m, while underlying profit before tax shot up by 98% to £18.4m. Shareholders have been well rewarded, with the share price climbing by more than 110% in the past 12 months.

Be glad you didn't...

Imagination Technologies (LSE: IMG) designs and licenses graphics and video-processing chips for mobile phones, computers and home electronics. The company is an important supplier to Apple and was performing strongly until early April. Then Apple announced that it would stop using Imagination's chips in the iPhone within the next two years. The share price went into freefall, dropping by more than 60%.