Huffington Post co-founder Arianna Huffington said on Thursday she would step down as editor-in-chief of the online news site that bears her name to focus on running her new venture, health and wellness startup Thrive Global.

Huffington said on Twitter that she thought the Huffington Post, which made its debut in 2005, would be "my last act" but now wanted to concentrate the new venture.

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"Thrive Global's mission is to change the way we work & live by ending the collective delusion that burnout is a necessary price for success," she tweeted.

In June, Huffington, 66, who recently wrote books on health and sleep-related issues such as "Thrive" and "The Sleep Revolution," announced the upcoming launch of Thrive Global. It will offer services to companies to improve the well being of employees by providing training, seminars, e-courses, coaching and other support.

It recently closed a Series A funding round ahead of a launch in the fall.

Verizon Communications Inc owns the Huffington Post through AOL, which bought the liberal American online news aggregator and blog for US$315 million in February 2011. After Verizon bought AOL in June 2015 for US$4.4 billion, Huffington renewed her contract to stay on as the site's editor-in-chief and president through 2019.

"As Thrive Global moved from an idea to a reality, with investors, staff, and offices, it became clear to me that I simply couldn't do justice to both companies," she said in a statement.

In addition to aggregating news, the Huffington Post features original reporting and won a Pulitzer Prize in 2012 for a series on wounded war veterans. There was no immediate word on who would succeed Huffington as editor-in-chief.

The Huffington Post, which has yet to turn a profit for AOL, has more than 100 million unique visitors per month.

AOL's takeover of the Huffington Post had its rocky moments, in part because of tensions between AOL chief executive Tim Armstrong and Huffington over issues such as allocation of resources, Reuters has reported.

Wireless service provider Verizon bought AOL, including its ad technology tools and content brands, such as the Huffington Post and TechCrunch, to make a push into digital media and advertising. It said last month it would buy web portal Yahoo Inc for US$4.8 billion.

Thrive Global's Series A funding round was led by Lerer Hippeau Ventures, a venture capital fund of Huffington Post co-founder Ken Lerer. Other investors include entrepreneur Sean Parker, Blue Pool Capital, Greycroft Partners and Advancit Capital.