Chart of the day: Apple shares spike suddenly on high volume

March 11, 2013, 8:29 PM UTC

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FORTUNE — After trading down all day — and all year, for that matter — Apple (AAPL) began moving higher at 2:26 p.m. Monday and didn’t stop until it hit resistance at $438. The stock closed at $437.87, up $6.15 (1.42%) for the day.

Wall Street watchers were left scratching their heads.