Provident Fund Investment Limits set asset classes, diversification, rating and concentration controls for fund investments. Rule 67 requires recognised provident fund investible moneys to be allocated across five defined categories-Government Securities; Debt Instruments; Short term Debt Instruments; Equities; and Asset Backed/Trust Structured investments-subject to specified category minima and maxima, sub limits for mutual funds, Tier I bonds and derivatives, minimum credit rating requirements for many debt instruments, limits on concentration and turnover, rules for fresh accretions and reinvestment of proceeds, and an obligation to consider exit where ratings fall below investment grade.