For Tesla CEO Elon Musk short-sellers have always been public enemy number one and this month will be no different.

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These investors, who bet that shares will fall, have had a lucrative May as the electric car maker contends with sagging demand for its flagship vehicles and concerns about rampant spending.

Investors holding short positions have earned more than $1 billion in mark-to-market profits in May, according to data compiled by S3 Analytics. That total ranks as one of the most profitable months for short-sellers since 2016.

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