Just out of curiosity do you also have Berkshire Hathway in your portfolio !!
No I don't. I now don't have an active US trading account. About 15 years ago I did invest in US stocks but my success was not that great.
I remember I invested in Ford Motor Co. That was a dud.
Then I invested in Johnson and Johnson. That was profitable.
I finally was sitting in the USA and researching on Indian stocks during night time. That is how I built my database on 350 Indian companies. I relocated to India and just am interested in Indian Markets. This itself consumes lot of time.
Just not worth the diversification. I believe that diversification is moving out of your core competence to that of incompetence.