Jitse Groen is not one to shy away from a fight — just ask Uber boss Dara Khosrowshahi, writes Jamie Nimmo for The Sunday Times.

In April the US ride-hailing app unveiled plans to take on FTSE 100 food delivery giant Just Eat Takeaway in Germany and Groen, the chief executive, let his feelings be known. “Interesting way of trying to depress our share price @dkhos,” Groen wrote on Twitter, copying in his rival.

Khosrowshahi responded by telling him to focus less on his share price and more on his technology and operations.

But six months on it has become increasingly difficult for Groen, 43, to ignore Just Eat Takeaway’s dismal stock market performance.

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