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Tesla stock hit a 52-week high on Monday. Courtesy of Tesla

Tesla stock is soaring, up more than $23, or 6.5%, in Monday trading. That’s a fresh 52-week high for the electric-vehicle pioneer. The problem is no one on Wall Street exactly knows why shares are rising.

One automotive analyst told Barron’s the Tesla (ticker: TSLA) move was “surprising,” noting that U.S. federal EV tax credits are set to decline in 2020. And a Wall Street trader didn’t have any extra insight when asked about Monday’s move.