A Collective Investment Trust (CIT) is a type of investment fund that pools money from multiple retirement plans, like 401ks, to invest in a shared portfolio of assets such as stocks, bonds, or other securities. It’s similar to a mutual fund but is only available through employer-sponsored retirement plans, not to the general public. Because CITs are typically managed by banks or trust companies and are not subject to the same regulations as mutual funds, they often have lower fees and more flexibility in how they’re managed. CITs are designed to help retirement plan participants grow their savings in a cost-effective, diversified way.