If you’d invested in: Cloudtag and Jimmy Choo

Wearable-tech group Cloudtag (Aim: CTAG) is attempting to carve a niche for itself in the increasingly crowded market for fitness trackers by targeting people who want to lose weight, rather than ardent gym-goers.

The company is only just starting to roll out its product to retailers, but investors are already getting excited. The share price has leapt by more than 100% in the past 12 months, most of that coming in the second quarter of this year.

Be glad you didn't buy...

Fashion house Jimmy Choo (LSE: CHOO) opened its first shop in London in 1996, and has since grown to be one of the world's top luxury shoe brands. It floated in October 2014 and shot into the FTSE 250 within six weeks of listing.

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But the sector has come off the boil in recent times, with two of its big markets Russia and China slowing down, and investors have become wary. The share price has declined so much almost 40% in the last year that it narrowly avoided relegation from the FTSE 250 earlier this year.