Dow Jones & Co. won't renew its partnership with technology news website AllThingsD and said longtime Wall Street Journal technology columnist Walter S. Mossberg will leave the paper at the end of the year.

AllThingsD, a venture with Mr. Mossberg and former Journal columnist Kara Swisher, rose to prominence covering the players of the high-tech industry and reviewing their products. Dow Jones' contract with AllThingsD is due to expire at year-end.

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