It is highly likely Buffett sold. A few months ago he said he doesn´t like to trim positions, once he sells he likes to sell everything. In late 2019 he actually trimmed WFC, so expected he wanted to get completely out of it. And it was not jsut to stay below 10% ownership, he sold more than that.
I find it odd that he sold at 2x current prices, and stopped selling for a while. Then unloaded the shares at 0.5x the price he sold a few months ago. He didn´t keep selling at higher prices and once it fell didn´t wait for slighly higher prices.
Some possible explanations:
-He didn´t like the approach taken by new management.
-Dind´t want to be the largest shareholder of a troubled bank given reputation and regulatory risk
-He wants to focus his banking investment in Bank of America
-Problems are bigger than initially expected and the future is grim for the bank.
-His assumption that it was the best franchise in banking was misplaced.
-Franchise has been impaired due to all the problems in the last few years
It is not a good sign given how close Buffett has been to the bank. He has been invested for decades. Once mentioned during the worst days of the crisis, that he would put 100% of his NW in Wells. We will soon know more but if he sold, we should probably pay attention.