There's money to be made on Tesla Inc.'s  (TSLA) - Get Report  issues.

Tesla shorts have made a killing over the last month, pushing their monthly mark-to-market profit to $1.13 billion, according to a note from S3 Analytics on Monday, Nov. 6. Tesla is now the largest equity short in the U.S. and Canada, with short interest totaling $8.27 billion.

Over the last year, short interest in Tesla has increased by $967 million. It leads the next-largest equity short in the U.S. and Canada, AT&T Inc. (T) - Get Report , by $1.69 billion on total short interest.

Overall short interest in the U.S. and Canada is now $776 billion, S3 wrote. Total short interest in the region has been on an upward trend in 2017.

The most profitable shorts over the last month in terms of daily mark-to-market profits were Tesla, AT&T, General Electric Co. (GE) - Get Report , Celgene Corp. (CELG) - Get Report and CenturyLink Inc. (CTL) - Get Report . The least profitable shorts over the last month were Intel Corp. (INTC) - Get Report , Inc. (AMZN) - Get Report , Apple Inc. (AAPL) - Get Report , Netflix Inc. (NFLX) - Get Report and Microsoft Corp. (MSFT) - Get Report .

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