Building a Historical SEC CIK-to-Ticker Mapping
Summary
The document asks whether a complete historical mapping between SEC Central Index Keys and stock tickers is publicly available. The answer says there is no single comprehensive public mapping and clarifies that CIKs are permanent filer identifiers rather than numbers routinely recycled. Mergers, reorganizations, and successor-issuer transitions can nevertheless complicate the relationship between a filer and the companies or tickers associated with it over time.
Suggested approaches include examining successor issuer disclosures in 8-K12B filings, combining current CIK mapping tools with historical sources, or obtaining data from commercial providers. The answer cites specialized services that may maintain historical mapping datasets, but does not verify their coverage or accessibility. It also notes that a CIK can be useful as a stable historical identifier, while the association between a CIK, corporate entity, and ticker may change. No complete dataset or reproducible mapping procedure is provided, so researchers building survivorship-aware equity universes would need to validate records against filings and corporate actions.
Key ideas
- The answer reports no single comprehensive public historical CIK-to-ticker dataset.
- CIK identifiers are described as permanent and non-recycled, while corporate reorganizations complicate issuer histories.
- Successor issuer disclosures may help connect predecessor and successor records.
- Current mapping tools and specialized data providers can serve as inputs to historical research.
- Any reconstructed mapping needs validation against filings and corporate actions.
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Full text
# complete historical mapping of EDGAR Central Index Key (CIK) to stock ticker # complete historical mapping of EDGAR Central Index Key (CIK) to stock ticker I see a previous question Central Index Key (CIK) of all traded stocks mentioned https://www.sec.gov/include/ticker.txt contains the EDGAR Central Index Key (CIK) to ticker mapping. However, this file doesn't seem to have the historical mapping. Neither do the other answers in that question or anywhere else I saw mentioned about historical mapping. SEC page says if a firm goes bankrupt or get bought, the CIK may be reused. So it's important to have the complete historical mapping. That is, it lists the complete mapping for each historical date from CIK to cicker. Does a complete historical mapping exist? Thanks. ## Answer by Greg (score 1) https://quant.stackexchange.com/a/82269 There isn't a single, comprehensive historical mapping of CIK to ticker symbols available to the public. But there are some important points to keep in mind, and resources you can use to build that mapping. One thing to correct: CIK numbers aren't recycled. According to the SEC's own documentation, "CIK numbers remain unique to the filer; they are not recycled." That's right: each company gets its own CIK number, and that number stays with it forever, unless, of course, the company goes through a merger or reorganization. Then things can get a little complicated. For example, Disney has had three different CIKs throughout its history: When Disney transitioned from CIK 1001039 to 1744489, they filed an 8-K12B explicitly stating: "This Current Report on Form 8-K is being filed for the purpose of establishing Disney as the successor issuer to Old Disney pursuant to Rule 12g-3(a)" Several approaches could help you build a historical CIK-ticker mapping: - Parse 8-K12B filings: These filings often indicate when a company becomes a successor issuer to another entity. - Use the sec-cik-mapper Python package: While primarily focused on current mappings, this tool provides a programmatic interface to CIK mappings that could be combined with other historical data sources. - Commercial data providers. Some specialized resources might help: - directEDGAR: They mentioned having a database called "CIK_MAPPING" that contains the content of the JSON file they use internally to map historical CIKs. - SEC-API.io: They offer services related to SEC filings and may have historical mapping capabilities. ## Answer by user11186 (score 0) https://quant.stackexchange.com/a/82097 The SEC website states: > CIK Unique number that EDGAR assigns to each filer identifying the filer’s >account. Publicly available. Permanent identifier—may not be changed and never expires https://www.sec.gov/submit-filings/filer-support-resources/how-do-i-guides/understand-utilize-edgar-ciks-passphrases-access-codes Seems like CIK is the historical identifier you are searching for!
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