The unique identifier the SEC assigns to every company or individual that files with EDGAR, its electronic filing system. It stays the same across every filing a company ever makes, which is why DiscoverIPO uses it as the stable key for tracking a company across multiple filings over time.
Company names change — mergers, legal-name corrections, rebrands — but a CIK never does. It's the one identifier guaranteed to follow a company across every filing it ever makes with the SEC, which makes it the reliable way to look a company up directly on EDGAR when a name search turns up ambiguous or outdated results.
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