LONDON--U.K. Sky PLC (SKY.LN) said Tuesday it invested a further $5 million in 1Mainstream, a California-based company that operates a platform to let content-providers distribute videos easily across a range of devices.

The new investment, in the form of a convertible debt security, supplements the $2 million Sky invested in August 2013.

1Mainstream will set up a new subsidiary, with Sky as a shareholder, developing new product concepts, Sky said.

"The expansion of the partnership with 1 Mainstream builds on Sky's ongoing program of investing in startups that continue to innovate and gain market share," Sky said.

Sky's biggest shareholder is 21st Century Fox, with a 39.1% stake. 21st Century Fox was until late June part of the same company as Wall Street Journal and Dow Jones Newswires owner News Corp.

Write to Ed Ballard at ed.ballard@wsj.com

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