INSP vs. ^SP500TR
INSP (Inspire Medical Systems, Inc.) is a stock, while ^SP500TR (S&P 500 Total Return) is an index. Over the past 5 years, INSP returned -21.80%/yr vs 13.05%/yr for ^SP500TR. At a 0.42 correlation, their price movements are largely independent.
Performance
INSP vs. ^SP500TR - Performance Comparison
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Returns By Period
In the year-to-date period, INSP achieves a -44.31% return, which is significantly lower than ^SP500TR's 10.48% return.
INSP
- 1D
- -0.77%
- 1M
- 20.28%
- 6M
- -47.01%
- YTD
- -44.31%
- 1Y
- -60.57%
- 3Y*
- -46.00%
- 5Y*
- -21.80%
- 10Y*
- —
^SP500TR
- 1D
- -0.79%
- 1M
- 1.22%
- 6M
- 8.34%
- YTD
- 10.48%
- 1Y
- 21.50%
- 3Y*
- 20.20%
- 5Y*
- 13.05%
- 10Y*
- 15.18%
INSP vs. ^SP500TR - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | |
|---|---|---|---|---|---|---|---|---|---|
INSP Inspire Medical Systems, Inc. | -44.31% | -50.25% | -8.87% | -19.24% | 9.48% | 22.31% | 153.46% | 75.64% | 72.52% |
^SP500TR S&P 500 Total Return | 10.48% | 17.88% | 25.02% | 26.29% | -18.11% | 28.71% | 18.40% | 31.49% | -3.57% |
Correlation
The correlation between INSP and ^SP500TR is 0.21, which is low. Their price movements are largely independent, making them effective diversification partners.
| Correlation | |
|---|---|
Correlation (1Y) Calculated over the trailing 1-year period | 0.21 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.31 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.41 |
Correlation (All Time) Calculated using the full available price history since May 3, 2018 | 0.42 |
Over the past year, the correlation between INSP and ^SP500TR has dropped to 0.21 - well below their long-term average of 0.42, suggesting their price drivers have been diverging.
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Return for Risk
INSP vs. ^SP500TR — Risk / Return Rank
INSP
^SP500TR
INSP vs. ^SP500TR - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for Inspire Medical Systems, Inc. (INSP) and S&P 500 Total Return (^SP500TR). 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.
Values are calculated on a 1-year rolling basis and updated daily. Risk-adjusted metrics are more stable over longer periods — use the period switch above to explore them.
| INSP | ^SP500TR | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | -2.53 | ||
| Sortino ratioReturn per unit of downside risk | -3.50 | ||
| Omega ratioGain probability vs. loss probability | 0.84 | 1.31 | -0.47 |
| Calmar ratioReturn relative to maximum drawdown | -0.84 | 2.43 | -3.27 |
| Martin ratioReturn relative to average drawdown | -1.24 | 10.66 | -11.90 |
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Drawdowns
INSP vs. ^SP500TR - Drawdown Comparison
The maximum INSP drawdown since its inception was -87.72%, which is greater than ^SP500TR's maximum drawdown of -55.25%. Use the drawdown chart below to compare losses from any high point for INSP and ^SP500TR.
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Drawdown Indicators
| INSP | ^SP500TR | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -87.72% | -55.25% | -32.47% |
Max Drawdown (1Y)Largest decline over 1 year | -72.19% | -8.89% | -63.30% |
Max Drawdown (3Y)Largest decline over 3 years | -87.72% | -18.75% | -68.97% |
Max Drawdown (5Y)Largest decline over 5 years | -87.72% | -24.49% | -63.23% |
Max Drawdown (10Y)Largest decline over 10 years | — | -33.79% | — |
Current DrawdownCurrent decline from peak | -84.25% | -1.11% | -83.14% |
Average DrawdownAverage peak-to-trough decline | -28.31% | -8.15% | -20.16% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 49.00% | 2.02% | +46.98% |
Volatility
INSP vs. ^SP500TR - Volatility Comparison
Inspire Medical Systems, Inc. (INSP) has a higher volatility of 11.53% compared to S&P 500 Total Return (^SP500TR) at 3.97%. This indicates that INSP's price experiences larger fluctuations and is considered to be riskier than ^SP500TR based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| INSP | ^SP500TR | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 11.53% | 3.97% | +7.56% |
Volatility (6M)Calculated over the trailing 6-month period | 42.88% | 9.99% | +32.89% |
Volatility (1Y)Calculated over the trailing 1-year period | 75.08% | 12.57% | +62.51% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 60.33% | 17.01% | +43.32% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 60.38% | 18.05% | +42.33% |
Frequently Asked Questions
INSP and ^SP500TR have a correlation of 0.21, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
INSP has higher volatility (11.53%) compared to ^SP500TR (3.97%). In terms of maximum drawdown, INSP dropped -87.72% vs ^SP500TR's -55.25%.
^SP500TR currently has the higher Sharpe Ratio (1.72 vs -0.81), 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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