{"slug":"when-historical-market-data-is-revised","qid":"symbol_reuse","label":"symbol_reuse","post_title":"when-historical-market-data-is-revised","post_url":"/blog/when-historical-market-data-is-revised#q-symbol_reuse","columns":["listing_year","symbols_reassigned","issuers_per_symbol"],"rows":[{"listing_year":"2018","symbols_reassigned":2,"issuers_per_symbol":2},{"listing_year":"2019","symbols_reassigned":1,"issuers_per_symbol":2},{"listing_year":"2020","symbols_reassigned":4,"issuers_per_symbol":2},{"listing_year":"2021","symbols_reassigned":4,"issuers_per_symbol":2},{"listing_year":"2022","symbols_reassigned":1,"issuers_per_symbol":2},{"listing_year":"2023","symbols_reassigned":2,"issuers_per_symbol":2},{"listing_year":"2024","symbols_reassigned":5,"issuers_per_symbol":2},{"listing_year":"2025","symbols_reassigned":26,"issuers_per_symbol":2.04},{"listing_year":"2026","symbols_reassigned":22,"issuers_per_symbol":2.09}],"shape":"ranking","sql":"WITH symbol_issuers AS\n(\n    SELECT\n        ticker,\n        issuer_name,\n        min(listing_date) AS first_listing\n    FROM global_markets.stocks_ipos\n    WHERE listing_date >= '2010-01-01'\n      AND listing_date <  '2026-10-01'\n      AND ticker != ''\n      AND ticker NOT IN ('SPCX')\n    GROUP BY ticker, issuer_name\n),\nreused AS\n(\n    SELECT\n        ticker,\n        count()            AS issuer_count,\n        max(first_listing) AS latest_listing\n    FROM symbol_issuers\n    GROUP BY ticker\n    HAVING issuer_count > 1\n)\nSELECT\n    toString(toYear(latest_listing)) AS listing_year,\n    count()                          AS symbols_reassigned,\n    round(avg(issuer_count), 2)      AS issuers_per_symbol\nFROM reused\nGROUP BY listing_year\nORDER BY listing_year","computed_at":"2026-10-02T15:08:09.612537+00:00","elapsed":0.002873934}