I think most of Michael's stash is in the company itself. That way it's like more protection. It's a harder target, but he controls the investing so he controls funds, so he still controls the company lol

“MicroStrategy uses a combination of institutional-grade digital asset custodians to store their Bitcoin holdings. These custodians provide cold storage solutions to ensure the security of the digital assets. Cold storage is an offline storage method that is considered the most secure way to store cryptocurrencies like Bitcoin, as it is not connected to the internet and thus less vulnerable to hacking attempts.

The company has not disclosed the specific names of all the custodians they use, but it is known that Coinbase is one of them. Coinbase is a well-established cryptocurrency exchange and custodian, providing secure storage solutions for institutional clients.

In summary, MicroStrategy stores their Bitcoin holdings with the help of multiple institutional-grade digital asset custodians, using cold storage solutions to ensure the security and safety of their digital assets.”