You COULD easily miss the brass plate on the door of Arsenalsgatan 8C in central Stockholm. It reads “Investor AB”—the name of the holding company that is controlled, through various foundations, by Sweden’s Wallenberg family. The discreet sign fits the family motto: Esse, non videri (to be, not to be seen). When you control 35% of the value of the national stock exchange, as the Wallenbergs do, invisibility is hard to achieve.
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