Entity Resolution explained for investors

Definition

Entity resolution maps identifiers such as ticker, CIK, company name, FIGI, ISIN, CUSIP, and aliases to a canonical entity record.

Investor read

Bad identity joins create fake conclusions. A ticker change, manager legal entity, subsidiary, or stale name can make holdings, filings, and financials point to the wrong thing.

Where it appears

• Company overview and entity APIs.
• Filing, ownership, insider, and statement joins.
• Watchlists and portfolio monitoring.

SEC API workflow

• Resolve user-entered identifiers before querying filings or financial data.
• Store canonical IDs alongside display tickers.
• Use provenance to show which source identifiers supported the match.

Common traps

• Treating company name matching as reliable enough for production.
• Ignoring delisted or renamed securities.
• Mixing issuer identity with share-class identity.

Key takeaways

• Entity resolution is foundational data quality work.
• It reduces false positives in investor workflows.
• Canonical identity should preserve source identifiers, not erase them.