# Data Dictionary - COT Positioning Momentum - 4-week change in net spec positioning, derived Parquet

**Units:** all `net_spec_change` values are in **contracts (4wk Δ)**.  Times are UTC.

| column | type | description |
|---|---|---|
| `zone` | str | Market & exchange name |
| `ts` | timestamp (UTC) | Report week |
| `net_spec_change` | float | 4-week Δ in net speculative contracts |
| `unit` | str | Unit |
| `res_min` | int | Native resolution (weekly = 10080) |

*Source: U.S. Commodity Futures Trading Commission (CFTC).*