def threshold(date=None, token='<STR_LIT>', version='<STR_LIT>'):
if date:<EOL><INDENT>date = _strOrDate(date)<EOL>return _getJson('<STR_LIT>' + date, token, version)<EOL><DEDENT>return _getJson('<STR_LIT>', token, version)<EOL>
The following are IEX-listed securities that have an aggregate fail to deliver position for five consecutive settlement days at a registered clearing agency, totaling 10,000 shares or more and equal to at least 0.5% of the issuer’s total shares outstanding (i.e., “threshold securities”).
    The report data will be published to the IEX website daily at 8:30 p.m. ET with data for that trading day.

    https://iexcloud.io/docs/api/#listed-regulation-sho-threshold-securities-list-in-dev

    Args:
        date (datetime); Effective Datetime
        token (string); Access token
        version (string); API version

    Returns:
        dict: result