Combining Momentum and Put Selling
"The CBOE S&P 500® PutWrite Index (ticker symbol “PUT”) tracks the value of a passive investment strategy (“CBOE S&P 500 Collateralized Put Strategy”) which consists of overlaying S&P 500 (SPM) short put options over a money market account invested in one- and three-months Treasury bills. The SPX puts are struck at-the-money and are sold on a monthly basis, usually on the 3rd Friday of the month. This is called the “roll date” and it matches the date of S&P 500 option expirations
The CBOE PUT write index has caught a lot of attention in recent years, as it historically has produced higher risk-adjusted and absolute returns than the underlying S&P 500 index. Risk adjusted returns take into account both returns and volatility. CBOE describes the index as following: