Berkshire’s (BRK.S) Buffett still have the puts he wrote for January outstanding in Burlington Northern (BNI)
With the $6 to $7 premium Buffett received for the options, he is still ahead in the stock that now sits at $75 and change.
Here is the filing: 
Disclosure (“none” means no position):none
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One reply on “Buffett Gets "Put" 3.2 Million Burlington Northern Shares $$”
“So You Want to Be The Next Buffett?”
Check out this great talk given at Harvard Business School:
http://changealley.blogspot.com/2008/12/sellers-mba-talk.html
“Personally, I’m amazed at how little conviction most investors have in the stocks they buy. Instead of putting 20% of their portfolio into a stock, as the Kelly Formula might say to do, they’ll put 2% into it. Mathematically, it can be shown that a 2% position is the equivalent of betting on a stock has only a 51% chance of going up, and a 49% chance of going down. Why would you waste your time even making that bet?”