In his upcoming biography by Walter Isaacson, Elon Musk strongly criticized short-sellers, describing them as “leeches on the neck of business,” Business Insider reported.

Musk recalled a period in 2018 when his company, Tesla Inc. (NASDAQ:TSLA), held the record as the most-shorted stock. He recounted how they had inside information about Tesla and even used drones for real-time monitoring of the company’s factories.

“They organized themselves into a shorty ground force and a shorty air force. The degree of inside information they had was insane,” he said.

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In the spring of 2018, Musk promised a significant increase in the production of Model 3. This led to a surge in short-selling of Tesla stock. Prominent investors including David Einhorn of Greenlight Capital and Jim Chanos of Kynikos Associates were among those betting against the company.

Despite the criticism and short-sellers, Tesla’s stock has more than doubled this year and increased nearly ten-fold since 2020, taking the company’s market capitalization above $850 billion.

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