Why exactly did Berkshire Hathaway go up so much?

I heard that Warren Buffet was buying and selling today but not much more than that, they had pretty much no loses when the stock market dropped so it can’t be because of that. I can’t really figure it out, perhaps someone else knows?

As a side note why do some o“f” m“y” words get substituted with apostrophes? That’s why I have those letters in quotations so they can actually say that word.