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/api/v1/cusip/cusip6/{cusip6}

Look up all securities sharing a 6-digit CUSIP issuer prefix.

Look up all securities sharing a 6-digit CUSIP issuer prefix. Returns all 9-digit CUSIPs with matching first 6 characters (same issuer, different securities — common stock, preferred, warrants, etc.).

1 tokensSince v3.14.0

Why use this

Find all securities sharing a 6-digit CUSIP issuer prefix — typically returns more security classes than [GET /api/v1/cusip/cik/{cik}](/docs/reference-data/cusip-api/get-cusip-cik) because the CUSIP6 prefix groups by ISSUER OPERATIONALLY (CINS-assigned by CUSIP Global Services) rather than by SEC CIK. So a single CUSIP6 like `037833` (Apple) returns the common stock CUSIP plus any preferred / convertible / debt CUSIPs the same issuer has registered through CUSIP services. Useful when you need all security types (common + preferred + convertibles + bonds) for an issuer in one call. Note: CUSIP6 is NOT stable across reorgs — successor CUSIPs typically get new CUSIP6 prefixes (RKLB went `G9442R` -> `773122` -> `773121`).

Common use case

Discovering all security classes (common, preferred, convertible, warrants, debt) for an issuer when you only have the 6-digit issuer code from a partial CUSIP reference. Also useful in 'find all securities Apple has issued' workflows where the customer wants common stock + any registered debt for credit-spread analysis.

Look up all securities sharing a 6-character CUSIP issuer prefix — the broadest issuer-keyed lookup in the CUSIP API. The CUSIP6 prefix groups by ISSUER OPERATIONALLY (CUSIP Global Services-assigned identifier scheme) rather than by SEC CIK, so a single CUSIP6 typically returns more security classes than GET /api/v1/cusip/cik/{cik}. Apple's 037833 returns common stock; Berkshire's 084670 returns both BRK-A and BRK-B; multi-issuer prefixes (rare but possible after corporate actions) return all relevant securities sorted by group priority then alphabetically. Critical caveat: CUSIP6 is NOT a stable issuer identifier across REORGS — when a security goes through a SPAC merger or redomicile, the successor CUSIPs typically have NEW CUSIP6 prefixes (RKLB went G9442R -> 773122 -> 773121). Use GET /api/v1/cusip/chain/{cusip} for chain-aware queries that span historical CUSIPs.

Parameters

NameInRequiredDefaultAllowedDescriptionExample
cusip6pathrequired——6-character CUSIP issuer prefix (case-insensitive). Real public-domain examples: `037833` (Apple), `594918` (Microsoft), `02079K` (Alphabet — covers both GOOGL `02079K305` and GOOG `02079K107`), `084670` (Berkshire — covers both BRK-A `084670108` and BRK-B `084670702`). Returns 404 when no securities are registered to the prefix.037833

Response schema

FieldTypeNullableDescription
cusip6stringnoEchoed input CUSIP6 (uppercased).
issuer_namestringnoMost-common issuer name across all securities sharing this CUSIP6. For multi-entity prefixes (rare but possible after reorgs) this is the modal name; consult `securities[].issuer_name` for per-CUSIP detail.
securitiesarraynoArray of all 9-character CUSIPs sharing this issuer prefix. Order: by `security_group` priority then by ticker alphabetical (Stocks first, then ETFs / Preferred / Warrants / Debt / Other). For Apple `037833`: returns common stock; for Berkshire `084670`: returns BRK-A then BRK-B.
securities[].cusipstringnoFull 9-character CUSIP.
securities[].tickerstringyesCanonical hyphen-form ticker. Null for unmapped securities (debt, private placements).
securities[].issuer_namestringnoIssuer name for THIS specific CUSIP — typically identical to the top-level `issuer_name` field but can vary slightly for amended-filings or post-reorg edge cases.
securities[].security_groupstringyesSecurity classification — `Stocks` / `ETFs` / `Preferred` / `Warrants` / `Debt` / `Other`. Filter to `Stocks` for common-equity-only views; `Preferred + Warrants` for hybrid-instrument exposure analysis.
securities[].cikstringyes10-character zero-padded SEC CIK for the issuer. Typically identical across all securities in the prefix (same legal entity).

Sample response

·
  • "cusip6": "084670"
  • "issuer_name": "BERKSHIRE HATHAWAY INC"
  • "securities":
    ]
}

Errors

StatusLabelDescription
200OKRequest succeeded.
400Bad RequestInvalid query, body, or path parameter.
401UnauthorizedMissing or invalid Authorization header / api_Token.
402Payment RequiredInsufficient token balance for this call. Top up
429Too Many RequestsRate limit exceeded for your tier (see /pricing for tier limits). Tier limits
500Server ErrorUnexpected server-side failure. Retry with backoff; report if persistent.

Code samples

curl "https://api.finradar.ai/api/v1/cusip/cusip6/{cusip6}?api_Token=YOUR_API_KEY" \
  -H "Authorization: Bearer YOUR_JWT_TOKEN"

Generate an API key in /account/credentials to run live queries (literal YOUR_API_KEY placeholder shown until then).