见备注, 10% 持股人
Michael Stuart Klein is a prominent investment banker and entrepreneur, best known as the founder and managing partner of M. Klein and Company, a global strategic advisory firm launched in 2012 serving CEOs, boards, governments, and institutional investors.[[3]](https://www.insidertrades.com/oklo-inc-stock/michael-stuart-klein-1/)[[8]](https://app.boardroomalpha.com/profiles/people/A1058535-MICHAEL_STUART_KLEIN) His career spans over 35 years, beginning in the M&A Advisory Group at Salomon Brothers, followed by more than two decades at Citi and its predecessors, where he rose to Chairman and Co-Chief Executive Officer of Citi Markets and Banking, executing numerous strategic advisory transactions.[[3]](https://www.insidertrades.com/oklo-inc-stock/michael-stuart-klein-1/)[[8]](https://app.boardroomalpha.com/profiles/people/A1058535-MICHAEL_STUART_KLEIN)
Klein is a prolific corporate insider and 10% owner in multiple SPACs, including Churchill Capital Corp XII (CXIIU) as 'See Remarks, 10% Owner,' with recent activity tied to entities like M. Klein Associates Inc. and Churchill Sponsor XII LLC.[[1]](https://fintel.io/i/klein-michael-stuart)[[4]](https://www.secform4.com/insider-trading/1327392.htm)[[6]](https://www.insiderinsights.com/free/index.php?s=filer&o=-1&a=&q=Klein+Michael+Stuart) He holds significant positions across 18 companies, such as Director and 10% Owner at Churchill Capital Corp III (CCXX), Churchill Capital Corp X (CCCXU), and Director at Oklo Inc. (OKLO) since May 2024, with a portfolio value exceeding $173 million and an estimated net worth of at least $423 million as of 2025.[[2]](https://www.gurufocus.com/insider/9031/michael-stuart-klein)[[3]](https://www.insidertrades.com/oklo-inc-stock/michael-stuart-klein-1/)[[5]](https://www.quiverquant.com/insiders/1327392/Michael-Stuart-Klein)[[7]](https://www.benzinga.com/sec/insider-trades/0001327392/michael-stuart-klein) Notable recent trades include purchasing 500,000 shares of Churchill Capital Corp XI (CCXIU) on December 18, 2025, for $5 million.[[2]](https://www.gurufocus.com/insider/9031/michael-stuart-klein)[[4]](https://www.secform4.com/insider-trading/1327392.htm)[[5]](https://www.quiverquant.com/insiders/1327392/Michael-Stuart-Klein)
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