Micron Technology, Inc. (NASDAQ:MU) stock has climbed so far, so fast that it is flashing one of the market’s most dependable warning signs.

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The memory-chip maker has surged roughly 190% year-to-date, pushing shares about 197% above their 200-day moving average, 75% above their 50-day moving average. Its Relative Strength Index, or RSI, has climbed to over 78, a level technical traders typically associate with overbought conditions and elevated pullback risk.

Yet Micron keeps making new highs.