If you’d invested in: Sound Energy and Vivint Solar

Sound Energy (Aim: SOU) is a London-based gas exploration and production company. The firm was founded in 2005 and initially focused on Indonesia. In 2011 it expanded into Italy, and in 2012 disposed of its Indonesian operations.

In 2015, it began operating in Morocco and secured licences that have delivered "above expectations". It made a pre-tax profit of £410,000 in the first half of 2016, up from a loss of £3.9m a year ago. Its shares have risen by over 500% in the past 12 months.

Be glad you didn't buy...

Vivint Solar (NYSE: VSLR)

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In March, Vivint abandoned a $2.2bn merger with now-bankrupt SunEdison, and failed in a bid to sue SunEdison for $1bn in damages. The shares have fallen by over 70% in the last year.