Exchange ticker symbol (Ticker)

• 01

  Agreement is a shortcut; disagreement proves nothing. Exact ticker-plus-venue agreement is a match shortcut, and it is the fourth and last rule the stage comparing identifier values runs. Disagreement is treated as nothing at all — no conflict, no penalty — because a company can be multi-listed and can change symbols, so two different tickers are a routine property of one company rather than evidence of two. Because only the agreeing direction carries any evidence, the verdict for a ticker is the cautious one: it does not decide a match.

• 02

  The venue arrives as free text. EDGAR gives the exchange as a written name rather than as the short code that names a venue unambiguously — the ISO 10383 market identifier code — so a ticker is only unambiguous once that text has been normalised, and the MIC register that would do the normalising is a planned source here, not a live one. Until it is wired, ticker-plus-exchange agreement fires on the strings as they arrive.

• 03

  The scorer holds ticker and exchange feature keys in its contract at zero, with no labelled support in the gold set — the pairs a human has judged. The zero is deliberate rather than pending: a weight with no observations behind it would be an assertion, so the key stays in the contract and the number stays at zero until labelled pairs move it.

• 04

  It is a poor primary key and a good corroborating one. A record that arrives with a name, a country and a ticker is materially easier to resolve than the same record without the ticker, and none of that improvement comes from the ticker deciding anything on its own.

Internal fixtures only. The historical 2026-08-29 per-tier recording covers 317 GB companies with identifier-rich arrivals seeding the catalogue first; the context tier includes country and registered-town prose. Its legacy replay has no full-prompt-verified calls and cannot certify current calibration. The September 5 CI reports cover 1,176 labelled pairs and 705 records over 250 companies using offline stubs. These are not independent customer holdouts or live production validation; the 99% minimum-input product target remains unmet. Scope is company and organisation identity only — not people, vessels, bank-account ownership, sanctions or emissions. Results may not be used for eligibility decisions about individuals, including employment, credit and tenancy.

• JurisdictionUnited StatesThere is no national company register in the United States. Coverage is Colorado, as public-domain bulk data, plus SEC EDGAR. Delaware publishes nothing.
• DefinitionTicker symbolA ticker is the short code identifying a security on a particular exchange — a property of a listing rather than of a company, and unambiguous only once the exchange is named.
• DefinitionMatch weightA match weight is the log-scaled contribution one comparison makes to a pair's score, positive when agreement is evidence of a match and negative when disagreement is evidence against.
• DefinitionCrosswalkA crosswalk is a mapping between the identifier schemes that name the same company in different systems — LEI to company number to CIK to ticker — so that data joined on one key can be joined to data keyed on another.
• GuideCompany identifiers explainedCompany number, LEI, CIK, ticker, SIREN and SIRET, DUNS, VAT, EUID and ISIN. What each identifies, who issues it, what it does not guarantee, and which ones actually decide a match.
• GuideFellegi-Sunter explained, with worked arithmeticThe probabilistic record linkage model behind most matching engines: m and u probabilities, match weights, the three decision regions, and a worked example you can check with a calculator.