OBIL Performance — US Treasury 12 Month Bill ETF
Data updated: 2026-07-28
OBIL returned +1.19% year to date and +3.83% over one year to May 2026. The annualised 3-year return is +4.57%. The fund trailed its Ultrashort Government Bond category average: $100 invested three years ago grew to $114, against $128 for the category, and to $104 over one year, against $106. Volatility over the past three years was 0.60% a year. In the 12 months to May 2026 the fund took in a net $45.6M, and assets reached $317.77M.
OBIL Growth of $100
What $100 invested in US Treasury 12 Month Bill ETF grew to, compounded from monthly returns reported on SEC Form N-PORT, against the Ultrashort Government Bond category average over the same months.
| Period | OBIL | Category average |
|---|---|---|
| 1 year (Jun 2025 – May 2026) | $104 | $106 |
| 3 years (Jun 2023 – May 2026) | $114 | $128 |
| Since data start (Nov 2022 – May 2026) | $117 | $131 |
OBIL Trailing Returns
Total returns to May 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | +1.19% |
| 1 year | +3.83% |
| 3 years (annualised) | +4.57% |
OBIL Annual Returns
Calendar-year total returns of US Treasury 12 Month Bill ETF, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–May) | +1.19% |
| 2025 | +4.28% |
| 2024 | +4.88% |
| 2023 | +4.70% |
| 2022 (Nov–Dec) | +0.54% |
OBIL Monthly Returns
Monthly total returns as reported on SEC Form N-PORT.
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | +0.3% | +0.2% | +0.1% | +0.3% | +0.3% | — | — | — | — | — | — | — |
| 2025 | +0.3% | +0.4% | +0.3% | +0.4% | +0.1% | +0.4% | +0.2% | +0.6% | +0.5% | +0.2% | +0.3% | +0.4% |
| 2024 | +0.4% | +0.1% | +0.4% | +0.2% | +0.5% | +0.4% | +0.7% | +0.7% | +0.7% | +0.1% | +0.3% | +0.5% |
| 2023 | +0.4% | +0.1% | +0.8% | +0.1% | 0.0% | +0.2% | +0.4% | +0.4% | +0.4% | +0.4% | +0.7% | +0.8% |
| 2022 | — | — | — | — | — | — | — | — | — | — | +0.1% | +0.4% |
OBIL Risk
Risk measures from monthly returns over Jun 2023 – May 2026.
- 3-year volatility (annualised): 0.60%
- 3-year Sharpe ratio: 0.11 (vs 4.5% risk-free rate)
- Best month: +0.76% (Dec 2023)
- Worst month: +0.05% (Oct 2024)
OBIL Fund Flows
Monthly money in and out of US Treasury 12 Month Bill ETF, from SEC Form N-PORT.
- 12-month net flow: $45.6M
- 12-month gross sales (incl. reinvestments): $349.7M
- Sales ÷ redemptions: 1.15×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| May 2026 | $7.0M | $2.0M | $5.0M |
| Apr 2026 | $0 | $0 | $0 |
| Mar 2026 | $9.0M | $0 | $9.0M |
| Feb 2026 | $5.0M | $0 | $5.0M |
| Jan 2026 | $5.5M | $2.0M | $3.5M |
| Dec 2025 | $0 | $6.0M | −$6.0M |
| Nov 2025 | $7.5M | $0 | $7.5M |
| Oct 2025 | $296.5M | $290.0M | $6.5M |
| Sep 2025 | $9.5M | $0 | $9.5M |
| Aug 2025 | $4.0M | $0 | $4.0M |
| Jul 2025 | $4.0M | $2.5M | $1.5M |
| Jun 2025 | $1.5M | $1.5M | −$2K |
OBIL Assets Under Management
Net assets of US Treasury 12 Month Bill ETF by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-05-31 | $317.77M |
| 2026-02-28 | $304.48M |
| 2025-11-30 | $302.76M |
| 2025-08-31 | $278.77M |
| 2025-05-31 | $272.78M |
| 2025-02-28 | $278.68M |
| 2024-11-30 | $262.61M |
| 2024-08-31 | $236.10M |
| 2024-05-31 | $206.96M |
| 2024-02-29 | $237.85M |
| 2023-11-30 | $199.88M |
| 2023-08-31 | $126.28M |
For information only. Not investment advice: figures are as reported in SEC filings and may contain errors or be out of date. Past performance does not guarantee future results.