RSP is designed to track the S&P 500 Equal Weight Index (total return), which holds the same S&P 500 constituents but resets them to approximately equal weights at each quarterly rebalance. This structure reduces mega-cap concentration and tends to behave more like a large-cap blend with a value/size tilt versus traditional cap-weighted S&P 500 exposure. (etfcentral.com)

There is no clear, single RSP-specific news catalyst; the ETF is mainly reflecting a relatively steady tape in U.S. equities alongside a rates backdrop that remains a key swing factor for broad cyclicals and smaller “average” S&P 500 constituents that matter more in equal-weighting. The 10-year Treasury yield has been holding in the mid-4% area in recent updates, which can cap upside for rate-sensitive equities while also influencing whether leadership broadens beyond the largest growth names. (slickcharts.com)

First, market breadth: equal-weight tends to do better when gains are spread across many stocks rather than dominated by a handful of mega-caps. Second, sector mix: because equal-weighting boosts exposure to sectors that are smaller in cap-weighted indices (and trims the biggest tech winners), relative returns can swing with industrials, financials, energy, and other “broader market” groups. Third, the equal-weight mechanism: quarterly rebalancing systematically trims winners and adds to laggards, embedding a contrarian/value-like effect that becomes more relevant when leadership rotates. (spglobal.com)