TSP Investment Options The TSP has essentially 5 investment options: C, S, I, F, and G Funds. I do not include the L funds as one of the investment options because they are simply a mix of the previously mentioned 5 funds. Where to Now... Door #1: More FERS Minutes Pick a New Subject to Watch. View more Door #2: In Person or Remote Consultation Get personalized information unique to your situation. Schedule Now Door #3: Personalized FERS Analysis Great for those who want to know more details about their specific retirement situation. Learn more Have a Question Name Email Address Phone Question Thank you! Oops!