Introduction – What Is the Fidelity Core Position? Your “core position” at Fidelity simply refers to where your uninvested cash goes inside your account. For example, if you have 75% in an S&P 500 index fund like VOO and 25% uninvested cash, that 25% cash will automatically go into whatever fund or vehicle you select as your “core position.” The core position basically acts as a wallet. When you buy something in your Fidelity account like a stock, you pay for it with money from that wallet. When you sell something, proceeds go into that wallet. The core position also facilitates transactions like check processing, electronic funds transfers, direct deposits, wire transfers, authorized credit cards, and other payments. There is no minimum balance requirement for the core position. You have several options for how exactly that cash is held, which is why you're on this page in the first place. First, let's get the obligatory reminder out of the way that market tim...