Anavex Life Sciences Corp (AVXL)

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"Each FINRA member firm is required to report its 'total' short interest positions in all customer and proprietary accounts in Nasdaq-listed securities twice a month. These reports are used to calculate short interest in Nasdaq stocks." https://www.nasdaq.com/solutions/short-interest-report

"FINRA requires firms to report short interest positions in all customer and proprietary accounts in all equity securities twice a month. All short interest positions must be reported by 6 p.m. Eastern Time on the second business day after the reporting settlement date designated by FINRA." https://www.finra.org/filing-reporting/regulatory-filing-systems/short-interest

This appears to cover all short positions, whether they are backed by borrowed shares or not. Thus the twice-monthly short report should include any naked short positions held overnight by market-makers.

This document, https://www.sec.gov/dera/reportspubs/special-studies/short-sale-position-and-transaction-reporting.pdf, shows that the markets overall have far more data on shorting activity than what is reported publicly twice a month.