Rex Tibbens, COO of ride-hailing service Lyft Inc., is leaving the company, according to a published report.

Axios said late Monday, citing multiple unnamed sources, that Tibbens will be leaving before the end of the year.

Axios also published an email it said had been sent to Lyft employees regarding the departure of Tibbens, who previously worked at Amazon.com (AMZN) and Dell Inc. (DELL) .

Included in that email: Tibbens has "been an incredible partner helping bring Lyft to every state, and launching strategic initiatives like Express Drive and our Nashville support center. To lead the charge for Lyft's next phase of growth, we're underway with the search for our next COO."

As various publications have noted, it will be important for Lyft to fill the COO position if it plans to go public in 2018. Lyft could not be reached late Monday for comment on the report.

Last month, Lyft said Alphabet Inc.'s (GOOGL) growth investment fund CapitalG is leading a $1 billion financing round for the company, lifting its valuation to $11 billion.

Lyft disclosed the funding details in a statement Oct. 19. The company also said CapitalG partner David Lawee will join Lyft's board.

Lyft has had a big year so far. In early October, the service completed its 500 millionth ride. It's now available to 95% of the U.S. population, Lyft said, up from 54% at the start of this year.

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