Tesla's current chief financial officer, Zach Kirkhorn, is frustrated with Musk's high-profile investment in bitcoin, according to people familiar with the matter. Tesla bought $1.5 billion worth of bitcoin in early 2021, and Zach Kirkhorn is reluctant to keep the cryptocurrency on the company's balance sheet, having sold most of it last year. SEC filings show that Tesla Inc. made an estimated $192 million in gains on its cryptocurrency investments.