Let’s run a small poll to see what kind of weight people have for Investor (A+B share series combined) in their investment portfolios? In this case, let’s only count listed holdings in the investment portfolio (excluding investment properties, forest land, etc.).
I would be interested in taking a large(r) weight in Investor for my portfolio, as the track record over time is so strong (it has beaten the S&P 500 indices etc.) and I don’t see the same kind of continuity risk here as with, for example, Berkshire Hathaway, where success has been concentrated in Buffett and Munger, who don’t have direct (comparable) successors. At Investor, generation after generation is raised to continue creating shareholder value. Perhaps fresh blood is also well-suited to staying on the pulse of global trends and investment allocation.
But when you think about it, it is quite a concentrated portfolio after all, as indices also tend to be. 20% ABB, 12% Atlas Copco, 8% SAAB, 7% AstraZeneca (=47%).
Currently, I have a 17% weight in Investor (and an additional 5% weight in EQT). If I sell one larger high-risk investment this year, I’ve been considering allocating the proceeds to Investor, which would raise its weight in my portfolio to around 50%. Of course, while writing this message, I realize the absurdity of my reflections, as I currently have 30% of my portfolio tied up in a single lottery ticket, while at the same time, I’m worrying about whether I’d dare move that sum into Investor, which is certainly 100x lower risk 
Here is the poll itself:
- <5%
- 5-15%
- 15-25%
- 25-35%
- 35-50%
- 50%<