Shares in sound industry pioneer Dolby Laboratories have leapt more than 40% on their
first day of trading on Wall Street.
Dolby Labs raised $495m (£262m) from the flotation, having sold 27.5 million shares at
Ray Dolby - who set the firm up after getting a physics PhD from Cambridge University -
still owns a 70% stake, now worth more than $1.7bn.
Dolby invented a way of cutting background hiss in tape recordings and later brought out
From Clapham to California
The surround-sound system has been used in thousands of films, DVDs and video
Strong demand for home cinema and DVD systems have helped boost company profits,
and Dolby reported net income of $39.8m on sales of $289m in the 12 months to the
end of 24 September.
Analysts warned that earnings growth is unlikely to continue at its current pace as the
home cinema market becomes saturated.
The company has said it is to focus on increasing revenues by licensing its technology
to digital broadcasters and broadband internet providers.
Demand from investors was strong and the $18 price tag was up from the initial offer
price of between $13.50 and $15.50.
The company, which was founded in 1965, had its headquarters on London's Clapham
Road before it moved to California in 1976.
Its first noise reduction product was called Dolby A.
In 1975, the company released its stereo cinema system, refining it for home use in