I sold in May. I'm in the largest cash position (t-bills) I've ever had. I might be completely wrong. I just looked at the situation with the oil crisis, and without any obvious way to end it, I just figure, if there was every a more obvious "sell in May and go away" year, this is it.
Maybe I miss out on some gains and buy back in December or January. Maybe I'll increase my Berkshire position. I don't know. But companies tend to push the bad news till the end of the year, and boy, howdy there could be some bad news this year.