Stock market seasonality and underinvested portfolio managers chasing a rally in stocks are two forces that could carry equity exchange traded funds into the end of the year.

Since 1950, the S&P 500 has gained 1.5% in November on average and 1.7% in December on average, the two largest monthly gains of a year, reports Lu Wang for Bloomberg.

Christopher Verrone, head of technical analysis at Strategas, said that the ratio of bullish to bearish newsletter writers is “still quite low,” which indicates that investors who have stayed on the sidelines may be itching to jump back into equities. [Why the Stock ETF Rally May Have Legs]

“The message of the market continues to be one of resiliency,” Verrone wrote in a note. “We’re not convinced this is the start of the next great bull market, but in the meantime this is not a tape we want to fight as the market moves into a firm seasonal period.”

“At the very least, this probably helps to keep a floor underneath the market as we push into year-end,” Verrone added.

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