The S&P 500 advanced nearly 18% in 2025, marking three back-to-back years of double-digit gains, following returns of 25.02% in 2024 and 26.29% in 2023. Such a feat is rare for Wall Street, occurring only five times before, this time being the sixth. Moreover, taken together, the S&P 500’s “three-peat” performance was its seventh-best run on record, roughly returning almost 80% from the start of 2023.