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Sciarra moving on to an entrepreneur-in-residence position at Andreessen Horowitz, a Pinterest investor.
Pinterest co-founder Paul Sciarra said late Monday he is departing the red-hot startup website.
Sciarra was listed in regulatory documents from 2010 as president and CEO of the company. However, co-founder Ben Silbermann has essentially taken on that role in recent months, though it's not clear if he officially holds the title, CNN reported.
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"After lots of reflection and plenty of discussion with Ben and others, I've decided that now is a good time for me to step down formally from day-to-day involvement," Sciarra said in a blog post.
Silbermann did not immediately respond to CNN's requests for comment.
Sciarra will be moving on to an entrepreneur-in-residence position at Andreessen Horowitz, a Pinterest investor, the Silicon Republic reported.
Sciarra, along with Silbermann and designer Evan Sharp, founded Pinterest more than three years ago, but it only recently caught fire.
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The site, an invite-only virtual pinboard, became one of the fastest-growing websites of all time in February although growth is gradually slowing, according to Fortune magazine.
Based on the latest data, Comscore projects that Pinterest will grow its total unique users in March to just over 20 million, a roughly 12 percent month-over month increase, after posting a 50 percent increase in February, USA Today reported.