Investor AB is a Swedish investment and holding company, often considered a de facto conglomerate. One of Sweden's largest companies, Investor AB serves as the investment arm of the prominent Swedish Wallenberg family; the family's companies are involved in a variety of industries, of which the primary industries are pharmaceuticals, telecommunications and industry.

The Wallenberg family is a prominent Swedish family renowned as bankers, industrialists, politicians, bureaucrats and diplomats, present in most large Swedish industrial groups, like Ericsson, Electrolux, ABB, SAS Group, SKF, AIK, Atlas Copco, Saab AB, and more. In the 1970s, the Wallenberg family businesses employed 40% of Sweden's industrial workforce and represented 40% of the total worth of the Stockholm stock market.