Company

Stock Split History

Returns the full history of stock splits for a single company, sourced from XBRL footnote disclosures (us-gaap:StockholdersEquityNoteStockSplitConversionRatio1 and its pre-2015 predecessor us-gaap:StockholdersEquityNoteStockSplitConversionRatio) in 10-K and 10-Q filings. Each event carries the split date, the conversion ratio, the type (forward or reverse), and provenance fields tying back to the original SEC filing.

Coverage

Forward and reverse splits since the XBRL mandate (post-2009; reliably tagged from 2011 onward).
Both types ride the same XBRL field — forwards report ratios > 1 (e.g. 4.0 for a 4-for-1), reverses report fractional ratios (e.g. 0.05 for a 1-for-20).
Roughly 2,500 distinct US companies have at least one tagged split event.
Pre-2010 splits are out of scope (predates XBRL).

Caveats

firstDisclosedAt is not the announcement date. It's when the structured XBRL fact first became available in an SEC filing. Some filers tag the split in the very next 10-Q (≈30-90 days lag); others wait until the annual 10-K (up to ~12 months). For real-time corporate-action use cases, pair with a dedicated corporate-actions feed.
date semantics vary by filer. Most filers tag the ex-date / payable date, but a minority tag the announcement date or the record date. Cross-check against an authoritative source for time-sensitive backtests.
Noop disclosures excluded. Rows with ratio = 1 (informational disclosures with no actual share-count change) are filtered out.

Results are ordered by split date descending. No pagination — even the most prolific splitter has fewer than ten events on record.

get/api/company/stock-splits

Query parameters

symbolstring

Stock ticker symbol. Identify the entity by exactly one of: symbol, cik, cusip, composite_figi, or share_class_figi. At least one is required.

cikinteger

SEC Central Index Key (CIK).

cusipstring

CUSIP identifier (9 characters).

composite_figistring

Composite OpenFIGI identifier.

share_class_figistring

Share-class OpenFIGI identifier.

Response

List of stock split events ordered by date (most recent first). Empty array if the company has no recorded splits.

datestring date required

The split date as tagged in the XBRL footnote (typically the ex-date or payable date; see caveats in the endpoint description). Format YYYY-MM-DD.

rationumber required

The conversion ratio. For a forward split, the number of post-split shares received per pre-split share (e.g. 4 for a 4-for-1 split). For a reverse split, the fractional equivalent (e.g. 0.05 for a 1-for-20 reverse split — 20 old shares become 1 new share).

To compute the post-split share count from a pre-split count: postSplit = preSplit × ratio.

type'forward' | 'reverse' required

Stock split direction, derived from the split ratio:

Value	Meaning
forward	ratio > 1: share count increases, per-share price decreases. Typical of large-caps managing share price after a long run-up.
reverse	ratio < 1: share count decreases, per-share price increases. Often used by small-caps to maintain exchange listing requirements (e.g. NASDAQ minimum bid price).

accessionstring required

SEC accession number of the filing where this split was first disclosed in XBRL. Use this with the SEC EDGAR full-text search to retrieve the exact source filing.

firstDisclosedAtstring date required

SEC acceptance date (YYYY-MM-DD) of the filing referenced by accession — the earliest date this split was machine-readable from EDGAR. Note this lags the actual split date by anywhere from weeks to months depending on the filer's reporting cadence.

Example response

[
  {
    "date": "2020-08-28",
    "ratio": 4,
    "accession": "0000320193-20-000096",
    "firstDisclosedAt": "2020-10-30"
  }
]