$IBIT vs $SPY: Weighing Bitcoin Exposure Against S&P 500 Diversification IBIT provides concentrated exposure to spot bitcoin as a grantor trust, while SPY offers broad diversification across approximately 500 large-cap U.S. equities via a unit investment trust structure. IBIT holds essentially one primary asset—bitcoin—with an expense ratio of 0.25%, whereas SPY tracks the S&P 500 Index with a lower expense ratio of 0.09% and a diversified portfolio. Top holdings in SPY include technology leaders such as NVIDIA Corp (NVDA), Apple Inc (AAPL), and Microsoft Corp (MSFT), driving sector concentration in information technology; IBIT has no equity holdings and 100% bitcoin exposure.