LFAI vs. SPTS
LFAI (LifeX 2050 Longevity Income ETF) and SPTS (SPDR Portfolio Short Term Treasury ETF) are both Government Bonds funds. LFAI is actively managed, while SPTS is passively managed. Over the past year, LFAI returned 4.26% vs 3.45% for SPTS. A 0.69 correlation means they provide meaningful diversification when combined. LFAI charges 0.25%/yr vs 0.03%/yr for SPTS.
Performance
LFAI vs. SPTS - Performance Comparison
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Returns By Period
In the year-to-date period, LFAI achieves a -0.43% return, which is significantly lower than SPTS's 0.45% return.
LFAI
- 1D
- -0.31%
- 1M
- 0.37%
- YTD
- -0.43%
- 6M
- -1.22%
- 1Y
- 4.26%
- 3Y*
- —
- 5Y*
- —
- 10Y*
- —
SPTS
- 1D
- -0.07%
- 1M
- 0.05%
- YTD
- 0.45%
- 6M
- 0.77%
- 1Y
- 3.45%
- 3Y*
- 4.18%
- 5Y*
- 1.81%
- 10Y*
- 1.67%
LFAI vs. SPTS - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | |
|---|---|---|---|
LFAI LifeX 2050 Longevity Income ETF | -0.43% | 6.06% | -7.12% |
SPTS SPDR Portfolio Short Term Treasury ETF | 0.45% | 5.05% | 0.03% |
Correlation
The correlation between LFAI and SPTS is 0.75, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.
| Correlation | |
|---|---|
Correlation (1Y) Calculated over the trailing 1-year period | 0.75 |
Correlation (All Time) Calculated using the full available price history since Sep 17, 2024 | 0.70 |
The correlation between LFAI and SPTS has been stable across timeframes, ranging from 0.69 to 0.75 - a consistent structural relationship.
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Return for Risk
LFAI vs. SPTS — Risk / Return Rank
LFAI
SPTS
LFAI vs. SPTS - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for LifeX 2050 Longevity Income ETF (LFAI) and SPDR Portfolio Short Term Treasury ETF (SPTS). Risk-adjusted metrics are performance indicators that assess an investment's returns in relation to its risk, enabling a more accurate comparison of different investment options.
| LFAI | SPTS | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | -1.95 | ||
| Sortino ratioReturn per unit of downside risk | -3.44 | ||
| Omega ratioGain probability vs. loss probability | 1.12 | 1.55 | -0.43 |
| Calmar ratioReturn relative to maximum drawdown | 0.81 | 4.13 | -3.32 |
| Martin ratioReturn relative to average drawdown | 2.28 | 16.52 | -14.24 |
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month. | |||
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Sharpe Ratios by Period
| LFAI | SPTS | Difference | |
|---|---|---|---|
Sharpe Ratio (1Y)Calculated over the trailing 1-year period | 0.68 | 2.63 | -1.95 |
Sharpe Ratio (5Y)Calculated over the trailing 5-year period | — | 0.92 | — |
Sharpe Ratio (10Y)Calculated over the trailing 10-year period | — | 0.98 | — |
Sharpe Ratio (All Time)Calculated using the full available price history | -0.16 | 0.49 | -0.65 |
Drawdowns
LFAI vs. SPTS - Drawdown Comparison
The maximum LFAI drawdown since its inception was -8.64%, which is greater than SPTS's maximum drawdown of -5.83%. Use the drawdown chart below to compare losses from any high point for LFAI and SPTS.
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Drawdown Indicators
| LFAI | SPTS | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -8.64% | -5.83% | -2.81% |
Max Drawdown (1Y)Largest decline over 1 year | -5.30% | -0.84% | -4.46% |
Max Drawdown (3Y)Largest decline over 3 years | — | -0.96% | — |
Max Drawdown (5Y)Largest decline over 5 years | — | -5.71% | — |
Max Drawdown (10Y)Largest decline over 10 years | — | -5.71% | — |
Current DrawdownCurrent decline from peak | -3.38% | -0.28% | -3.10% |
Average DrawdownAverage peak-to-trough decline | -3.52% | -1.72% | -1.80% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 1.87% | 0.21% | +1.66% |
Volatility
LFAI vs. SPTS - Volatility Comparison
LifeX 2050 Longevity Income ETF (LFAI) has a higher volatility of 2.03% compared to SPDR Portfolio Short Term Treasury ETF (SPTS) at 0.34%. This indicates that LFAI's price experiences larger fluctuations and is considered to be riskier than SPTS based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| LFAI | SPTS | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 2.03% | 0.34% | +1.69% |
Volatility (6M)Calculated over the trailing 6-month period | 4.42% | 0.86% | +3.56% |
Volatility (1Y)Calculated over the trailing 1-year period | 6.30% | 1.32% | +4.98% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 7.16% | 1.98% | +5.18% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 7.16% | 1.72% | +5.44% |
LFAI vs. SPTS - Expense Ratio Comparison
LFAI has a 0.25% expense ratio, which is higher than SPTS's 0.03% expense ratio. However, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.
Dividends
LFAI vs. SPTS - Dividend Comparison
LFAI's dividend yield for the trailing twelve months is around 13.55%, more than SPTS's 3.91% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
LFAI LifeX 2050 Longevity Income ETF | 13.55% | 16.48% | 1.91% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% |
SPTS SPDR Portfolio Short Term Treasury ETF | 3.91% | 3.99% | 4.25% | 3.61% | 1.27% | 0.19% | 0.70% | 2.21% | 2.04% | 1.20% | 0.95% | 0.83% |
Frequently Asked Questions
LFAI and SPTS have a correlation of 0.75, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
LFAI has higher volatility (2.03%) compared to SPTS (0.34%). In terms of maximum drawdown, LFAI dropped -8.64% vs SPTS's -5.83%.
On 1-year performance, LFAI leads with 4.26% vs 3.45% for SPTS. On fees, SPTS is cheaper at 0.03% per year. On volatility, SPTS has been the lower-risk option at 0.34%. The better choice depends on whether you care most about return, fees, risk, or income.
Over the 1-year period, LFAI has performed better with a 4.26% return vs 3.45%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.
SPTS is cheaper with a 0.03% expense ratio, compared with 0.25% for LFAI.
LFAI has the higher dividend yield at 13.55%, compared with 3.91% for SPTS.
They also come from different issuers: Stone Ridge and State Street. Their fees differ too: 0.25% for LFAI and 0.03% for SPTS.
SPTS currently has the higher Sharpe Ratio (2.63 vs 0.68), meaning it's delivered slightly more return per unit of risk over the trailing 12 months. However, this ranking shifts over time - use the Risk/Return Score above for a more comprehensive view that combines Sharpe, Sortino, and other measures used by quantitative funds.
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