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The S&P closed Tuesday unchanged through two decimal places at 2,268.90, meaning it did not record a gain or a loss. The last time the index ended a trading day flat was Jan. 3, 2008. That said, the S&P rose 0.46 percent to 2,279.27 at its session high, about 0.12 percent away from the all-time intraday high it reached Friday.
Before 2008, the benchmark index had gone nearly 11 years without posting an unchanged day. Since 1980, the S&P has recorded just 10 unchanged sessions.
S&P intraday chart
— CNBC's Robert Hum contributed to this report.