Berkshire Hathaway Lost $49.7B in First Quarter Stung by Coronavirus

It's worth re-reading Buffett's 2019 annual letter (https://www.berkshirehathaway.com/letters/2019ltr.pdf ; first page especially) in this context, as he was already warning against over-reading oscillations in the value of their owned assets.

Now, it would be certainly interesting to know if Berkshire Hathaway would deem this movement to be "other than temporary", and to look at the magnitude of their writedown if so. But remember that they take a very long view - if anything, we might see them to start deploying assets soon to buy up more temporarily-devalued-but-financially-sound businesses to add to their portfolio.