This copy is for your personal, non-commercial use only. To order presentation-ready copies for distribution to your colleagues, clients or customers visit http://www.djreprints.com. Among America’s public retirement systems, two stand out for having enough assets to cover their future obligations: Wisconsin and South Dakota. Recent public filings by Wisconsin highlight some bold stock trades. Barron’s noted last week some first-quarter trades made by South Dakota’s pension plan. This week, the State of Wisconsin Investment Board, the investment manager for the Wisconsin Retirement System’s $104 billion in assets, disclosed what it was up to in the first quarter.