Quick answer
COSTAR GROUP, INC. (CSGP) disclosed a 10-for-1 stock split in SEC filings (first reported in a 10-Q filed 2021-07-28, period ending 2021-06-07).
Data as of 2021-07-28. Source: SEC EDGAR XBRL filings
| Period end | Split ratio | Form | Filed |
|---|---|---|---|
| 2021-06-07 | 10-for-1 | 10-Q | 2021-07-28 |
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Last updated 2026-10-16. Data only, not financial or tax advice.