# Data Dictionary - U.S. Equity Fails-to-Deliver (FTD) - aligned historical Parquet

**Units:** all `fails_shares` values are in **shares**.  Times are UTC.

| column | type | description |
|---|---|---|
| `zone` | str | Ticker symbol |
| `ts` | timestamp (UTC) | Settlement date |
| `fails_shares` | float | Aggregate net shares failed-to-deliver (CNS balance) |
| `unit` | str | Unit |
| `res_min` | int | Native resolution (daily = 1440) |

*Source: U.S. Securities and Exchange Commission (SEC).*