A 130–30 fund or a ratio up to 150/50 is a type of collective investment vehicle, often a type of specialty mutual fund, but which allows the fund manager simultaneously to hold both long and short positions on different equities in the fund. Traditionally, mutual funds were long-only investments. 130–30 funds are a fast-growing segment of the financial industry; they should be available both as traditional mutual funds, and as exchange-traded funds (ETFs). While this type of investment has existed for a while in the hedge fund industry, its availability for retail investors is relatively new.
A 130–30 fund is considered a long-short equity fund, meaning it goes both long and short at the same time. The "130" portion stands for 130% exposure to its long portfolio and the "30" portion stands for 30% exposure to its short portfolio. The structure usually ranges from 120–20 up to 150–50 with 130–30 being the most popular and is limited to 150/50 because of Reg T limiting the short side to 50%.