Private-equity firm Great Hill Partners has agreed to acquire Gizmodo Media Group from Univision Communications Inc., the companies said, ending the Spanish-language broadcaster’s foray into English-language digital media.

James Spanfeller, the former chief executive of Forbes.com and president of consumer magazines at digital publisher Ziff Davis, will become chief executive of G/O Media Inc., a new company created from the assets. Gizmodo Media Group includes sites Gizmodo, The Onion, Jezebel, Deadspin and Lifehacker.

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