SPYM: S&P 500 Monthly Dashboard For May

This monthly S&P 500 dashboard finds the index remains somewhat extended: the median S&P 500 company is about 10% overvalued versus 11‑year historical averages, with aggregate quality scores only marginally above baseline. Sector dispersion is pronounced — energy shows the best mix of value and quality, while real estate and healthcare are relatively cheap; materials, technology, industrials and utilities look notably rich. Mega‑cap leadership has skewed cap‑weighted returns: the SPDR Portfolio S&P 500 vehicle (SPYM) is highlighted as a low‑cost, liquid S&P‑tracking ETF, and cap‑weighted performance has outpaced equal‑weighted by a wide margin (29.9% vs. 20.5% over 12 months), implying concentration risk for broad‑market exposure.