State of Wisconsin Investment Board | 8,600 followers on LinkedIn. The State of Wisconsin Investment Board (SWIB) is a premier investment organization that provides investment management of trusts and public funds. Of the approximately $178 billion in assets under management, a majority is comprised of the Wisconsin Retirement System (WRS), which consistently ranks among the 10 largest public pension funds in the U.S. SWIB also manages the State Investment Fund, which operates as the state’s cash management funds, and other separately managed funds.