Subject: Re: Done buying OXY?
"Though BRK has permission to own up to 50%, maybe Buffett is satisfied with the the current 25% ownership."

Don't forget the warrants. Berkshire has warrants to buy another 83.9 million common shares for $5 billion, or $59.62 each.

Last 13f shows they owned 221,990,942 common shares.
https://www.sec.gov/Archives/e...

Buying another 84 million shares would be a sizable increase in ownership.