Quick answer
COMCAST CORP (CMCSA) disclosed a 2-for-1 stock split in SEC filings (first reported in a 10-Q filed 2017-04-27, period ending 2017-01-24).
Data as of 2017-04-27. Source: SEC EDGAR XBRL filings
| Period end | Split ratio | Form | Filed |
|---|---|---|---|
| 2017-01-24 | 2-for-1 | 10-Q | 2017-04-27 |
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Last updated 2026-10-16. Data only, not financial or tax advice.