{"slug":"how-to-read-the-equity-trade-tape","qid":"sessions_by_year","label":"Sessions and symbols on the tape, by year","post_title":"How to Read the US Equity Trade Tape","post_url":"/blog/how-to-read-the-equity-trade-tape#q-sessions_by_year","columns":["year","first_session","sessions","symbols"],"rows":[{"year":2003,"first_session":"2003-09-10","sessions":79,"symbols":8657},{"year":2004,"first_session":"2004-01-02","sessions":252,"symbols":9445},{"year":2005,"first_session":"2005-01-03","sessions":252,"symbols":9398},{"year":2006,"first_session":"2006-01-03","sessions":251,"symbols":9450},{"year":2007,"first_session":"2007-01-03","sessions":251,"symbols":9798},{"year":2008,"first_session":"2008-01-02","sessions":253,"symbols":9356},{"year":2009,"first_session":"2009-01-02","sessions":252,"symbols":8888},{"year":2010,"first_session":"2010-01-04","sessions":252,"symbols":8870},{"year":2011,"first_session":"2011-01-03","sessions":252,"symbols":8728},{"year":2012,"first_session":"2012-01-03","sessions":250,"symbols":8826},{"year":2013,"first_session":"2013-01-02","sessions":252,"symbols":8795},{"year":2014,"first_session":"2014-01-02","sessions":252,"symbols":8977},{"year":2015,"first_session":"2015-01-02","sessions":252,"symbols":9170},{"year":2016,"first_session":"2016-01-04","sessions":252,"symbols":9316},{"year":2017,"first_session":"2017-01-03","sessions":251,"symbols":9458},{"year":2018,"first_session":"2018-01-02","sessions":251,"symbols":9646},{"year":2019,"first_session":"2019-01-02","sessions":252,"symbols":9900},{"year":2020,"first_session":"2020-01-02","sessions":253,"symbols":10578},{"year":2021,"first_session":"2021-01-04","sessions":252,"symbols":13155},{"year":2022,"first_session":"2022-01-03","sessions":251,"symbols":13332},{"year":2023,"first_session":"2023-01-03","sessions":250,"symbols":13048},{"year":2024,"first_session":"2024-01-02","sessions":252,"symbols":12647},{"year":2025,"first_session":"2025-01-02","sessions":250,"symbols":13423},{"year":2026,"first_session":"2026-01-02","sessions":175,"symbols":14195}],"shape":"series","sql":"SELECT\n    toYear(date)                 AS year,\n    toString(min(date))          AS first_session,\n    uniqExact(date)              AS sessions,\n    uniqExact(ticker)            AS symbols\nFROM global_markets.stocks_daily_aggs\nWHERE date >= '2003-09-10'\nGROUP BY year\nORDER BY year","computed_at":"2026-09-15T01:15:13.317667+00:00","elapsed":0.001891842}