Buy-side positioning in S&P 500 futures has reached new all-time highs as the index continues to hit record levels. According to Citigroup strategists, short-sellers are capitulating, marking a significant shift in market dynamics. The S&P 500 is on track for its best performance since 2021, with investor positioning described as 'completely one-sided.' This trend indicates a growing confidence among investors, contrasting sharply with the struggles faced by short-sellers as the index maintains its upward trajectory.