spb/market-atlas

1# sec-company-tickers23`https://www.sec.gov/files/company_tickers_exchange.json` — SEC registrants with ticker, exchange (Nasdaq/NYSE/CBOE/OTC) and CIK.45- **Type**: BULK_FILE · **Rights**: OFFICIAL_OPEN_DATA · daily.6- **Output**: `instruments` proposals. Listed tickers (Nasdaq/NYSE/CBOE) may be created (`eq_us_<mic>_<symbol>`); OTC or unknown venues only enrich existing instruments (`createIfMissing: false`).7- **Effect**: every US equity gets a `companies` row with CIK → EDGAR filings link to instruments.8- **Quirk**: SEC uses `BRK-B`; Market Atlas canonical symbol is `BRK.B` with the dash form kept as alias.9