4-Week Treasury Bill Secondary Market Rate, Discount Basis
TB4WKratesFree tier
| Series ID | TB4WK |
|---|---|
| Units | Percent |
| Frequency | Monthly |
| Category | rates |
| Latest observation | 2026-09-01 |
| History | Point-in-time: every value as first published plus each revision, so backtests see only what was known on the day |
Latest reading
The latest 4-Week Treasury Bill Secondary Market Rate, Discount Basis observation, for 2026-09-01, is 3.79 Percent, up from 3.64 for 2026-08-01. It has not been revised since it was first published. 1.0% of observations in this history were revised after first release.
| Latest observation | 2026-09-01 |
|---|---|
| Latest value | 3.79 Percent |
| Previous | 3.64 (2026-08-01) |
| Change | 0.15 (+4.1%) |
| First published value | 3.79 |
| Last release | 2026-10-01 |
| Vintages stored | 302 |
| Observations | 303 |
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