Is the Federal Reserve Requirement for Bank Holdings?

Berkshire has been trimming its stake in Wells Fargo and any other banks each year to bring Berkshire's ownership stake below the 10% threshold required by the Federal Reserve for bank holdings. I was kind of surprised though to see you move to trim all of your holdings where possible on a regular basis to eliminate the regulatory requirements that come with ownership levels above 10%. In my view, this limits the investable universe that Berkshire at least warned can meaningfully invest in longer term given that Warren manages a large chunk of Berkshire's $200 million equity portfolio.