Also fair point. Berkshire has such a significant impact on the market that they have to take a long-term approach just to changing their stake, lest they sway

Also fair point. Berkshire has such a significant impact on the market that they have to take a long-term approach just to changing their stake, lest they sway the market. I've never been involved with a big firm like this, but I would also imagine there's some regulation involved around what/how they're able to operate, so that could also be a non-trivial factor in their decisions and current positions.