Shares in a US games company have soared more than 300% in the past week - the result of a fight between private and professional investors.

Video games bricks-and-mortar retailer Gamestop is arguably something of a relic in a world moving online.

But its share price soared another 120% in Wednesday trading in New York.

Analysts blame tech-savvy young day traders, who they say are taking on hedge funds in a conflict with generational overtones.

And the phenomenon could be spreading to Europe, with several stocks subject to unusual fluctuations in Wednesday trading.

It’s a battle between Wall Street pros and upstart investors using social media platforms such as Reddit, analysts say. And at the moment, the upstarts have the upper hand.

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