Market Yield on U.S. Treasury Securities at 1-Year Constant Maturity, Quoted on an Investment Basis
GS1ratesFree tier
| Series ID | GS1 |
|---|---|
| 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 Market Yield on U.S. Treasury Securities at 1-Year Constant Maturity, Quoted on an Investment Basis observation, for 2026-09-01, is 4.37 Percent, up from 4.03 for 2026-08-01. It has not been revised since it was first published. 0.1% of observations in this history were revised after first release.
| Latest observation | 2026-09-01 |
|---|---|
| Latest value | 4.37 Percent |
| Previous | 4.03 (2026-08-01) |
| Change | 0.34 (+8.4%) |
| First published value | 4.37 |
| Last release | 2026-10-01 |
| Vintages stored | 360 |
| Observations | 882 |
Get it in Python
import finzdata as yf
df = yf.Client().macro("GS1")
df.tail()Or chart it live on FinzData Explore.
Get a free API keySee history bundlesDownload free samples
Related rates series
- 90-Day AA Financial Commercial Paper Interest Rate
- Market Yield on U.S. Treasury Securities at 1-Year Constant Maturity, Quoted on an Investment Basis
- Market Yield on U.S. Treasury Securities at 10-Year Constant Maturity, Quoted on an Investment Basis
- Market Yield on U.S. Treasury Securities at 1-Month Constant Maturity, Quoted on an Investment Basis
- Market Yield on U.S. Treasury Securities at 2-Year Constant Maturity, Quoted on an Investment Basis
- Market Yield on U.S. Treasury Securities at 20-Year Constant Maturity, Quoted on an Investment Basis
- Market Yield on U.S. Treasury Securities at 30-Year Constant Maturity, Quoted on an Investment Basis
- Market Yield on U.S. Treasury Securities at 3-Month Constant Maturity, Quoted on an Investment Basis
- Market Yield on U.S. Treasury Securities at 5-Year Constant Maturity, Quoted on an Investment Basis
- Market Yield on U.S. Treasury Securities at 6-Month Constant Maturity, Quoted on an Investment Basis
- Market Yield on U.S. Treasury Securities at 7-Year Constant Maturity, Quoted on an Investment Basis
- Effective Federal Funds Rate