RSP

Invesco S&P 500 Equal Weight ETF

An exchange-traded fund that tracks the S&P 500 but gives each of the 500 companies an equal slice of the pie, rather than letting the biggest firms dominate. Launched in 2003 by Rydex Investments under the ticker RSP, it passed through Guggenheim before landing with Invesco in 2018. It's widely credited as the first "smart beta" ETF, and it rebalances every quarter to keep every stock's weight even.

ETF tracking the S&P 500 Equal Weight Index