In England we find similarly named Clean Air Power chasing a related strategy with heavy-duty diesels with a recently announced OEM deal with Volvo Bus.

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The two exchanges appear to make a good fit: The tech-fuelled Nasdaq, which is the world's largest electronic exchange, is home to technology bellwethers like Dell and Microsoft, while OMX is also technology-driven with the likes of Ericsson and Nokia in its ranks, along with truck and bus-maker Volvo.

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Volvo retains its generally more profitable truck and bus business.

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Mercedes and Volvo, for instance, had been interested in buying the bus maker, but were rebuffed.

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