The Wallenberg family's investment company Investor is a stock that should be a mainstay in every shareholder's portfolio. This is what Dagens industri writes with a buy recommendation under the vignette Share of the Week.

Investor is liked because the company has a strong mix of quality listed companies, has unlisted assets that are conservatively valued, and has historically outperformed around net asset value growth.

On the downside, the stock is currently trading at a lower discount to NAV than previously. But this does not deter Di.

"Historically, it has been possible to buy Investor at significantly higher discounts, but this figure should not be ignored. Di expects Investor's holdings to continue to outperform the stock market and that the time when it was possible to buy the investment company at high discounts to net asset value is over," the newspaper writes.

The fact that only just over 600,000 of Sweden's 2.3 million shareholders hold the stock means that many have missed out on Investor, which "should be as much a given in the portfolio as always having cash as dry powder". "It's time to get in line and buy," concludes Di.