(Bloomberg) — Even a choppy September hasn’t changed a key measure of 2021’s bullish tone: only twice in the last 20 years have more S&P 500 stocks headed into the fourth quarter with gains for the year.Most Read from BloombergWall Street Titans Warn of the Next Big Risks for InvestorsThe Country That Makes Breakfast for the World Is Plagued by Fire, Frost and DroughtThe Unstoppable Appeal of Highway ExpansionHSBC Bets Big on China as Pressure Mounts in LondonHow Los Angeles Became the City of
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