Go-Pro shares are up 173 per cent on their IPO value.
The huge rise began when shares launched at $28.65 on 26 September: they were priced at $78.25 at the time of writing.
The brand made its fame through shock-proof video cameras marketed at extreme sports enthusiasts. They can be easily mounted to helmets, bikes or surfboards and are used to share experiences on the internet.
As a result, the appeal of GoPro is that it links well with non-hardwear tech such as social networks. According to the Wall Street Journal, its revenue last year was $1bn with more modest profit of $60m.