After a breathtaking run, the market just flashed a rare signal that has an impressive track record of predicting a big move in the stock market over the coming 12 months.

This year has been one for the record books. After hitting a new all-time high in February, the S&P 500 ( ^GSPC -0.29% ) promptly reversed course, tumbling 19%. Fears about the impact of tariffs and their potential to reignite inflation were pervasive. However, since those dark days in early April, the market has rebounded, hitting 10 record highs in July and gaining 29% over the past four months.

During that time, the market closed above a key metric for 68 consecutive days. A streak of that magnitude has occurred just eight times before. The data shows that on almost every previous occasion, the benchmark ind

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