{"id":147,"date":"2025-04-14T19:43:25","date_gmt":"2025-04-14T19:43:25","guid":{"rendered":"https:\/\/capitalsystemsaps.com\/?page_id=147"},"modified":"2025-05-22T20:42:55","modified_gmt":"2025-05-22T20:42:55","slug":"historical-short-availability-data","status":"publish","type":"page","link":"https:\/\/capitalsystemsaps.com\/index.php\/historical-short-availability-data\/","title":{"rendered":"Historical Short Availability Data"},"content":{"rendered":"\n

As part of our quantitative trading approach, we are maintaining two comprehensive datasets of historical intraday short sale availability<\/strong> across a broad universe of assets.<\/p>\n\n\n\n

Initially developed strictly for internal research, these datasets are now available for purchase<\/strong> to institutions, academics, and independent researchers. Since we record short sale availability on all US traded stocks and over 500 Cryptocurrencies, but only trade a fraction of them, much of the data remains untapped \u2014 and could potentially be valuable to others.<\/p>\n\n\n\n

Please refer to our GitHub repository<\/a><\/strong>, which includes research examples along with both processed and raw dataset samples.<\/p>\n\n\n\n

If you’re conducting research in this area and would benefit from access to granular intraday historic short availability data, we invite you to contact us<\/strong><\/a> for specific details. A general description of our offering and it\u2019s value (along with samples) are highlighted below.<\/p>\n\n\n\n

Note:<\/strong> Short availability data (which is our unique offering) is often confused with short interest data, but the two are fundamentally different.<\/p>\n\n\n\n

Short Availability (Our Offering)<\/strong><\/p>\n\n\n\n

Short availability refers to the number of shares available for borrowing at a given time, for short selling. It fluctuates based on supply and demand in the securities lending market. A lack of available shares to borrow can create a supply constraint, often causing the asset to trade at a premium.<\/p>\n\n\n\n

Short Interest<\/strong><\/p>\n\n\n\n

Short interest represents the total number of shares that have already been sold short but not yet covered or closed out. It is typically expressed as a percentage of total shares outstanding.<\/p>\n\n\n\n

We have found Short Availability<\/strong> to be of critical value<\/strong> for two key reasons:<\/p>\n\n\n\n

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  1. More Realistic Backtesting<\/strong>\n