To sum it upfront: In my opinion there was nothing “really new” or spectacular in Buffett’s 2016 letter.
Operationally, 2016 was not such a good year for Berkshire, operating profit was flat and book value gain lower than the S&P. Nevertheless Berkshire’s stock price outperformed the S&P 500. Comprehensive income however was very good, around 50% better than 2015 (which was not very good).
Net tangible assets declined to around 170 bn from 186 bn mostly due to the Precision Cast Part acquisition which added more than 40 bn in intangibles.
I made some notes which might be interesting to some reader (or not).
Berkshire share repurchases:
The most interesting part from my side was where he writes about share repurchases in general and Berkshire in particular. I actually know some investors who treat the “Buffett put” at 120% of NAV as a real one, assuming that the stock price can never go below that level. This is what Buffet says: