INSP vs. VOO
INSP (Inspire Medical Systems, Inc.) is a stock, while VOO (Vanguard S&P 500 ETF) is S&P 500 fund tracking the S&P 500 Index. Over the past 5 years, INSP returned -22.80%/yr vs 12.83%/yr for VOO. Their 0.41 correlation means their historical movements had little consistent relationship.
Performance
INSP vs. VOO - Performance Comparison
Loading charts...
Returns By Period
In the year-to-date period, INSP achieves a -45.56% return, which is significantly lower than VOO's 10.16% return.
INSP
- 1D
- 0.38%
- 1M
- 6.94%
- 6M
- -33.74%
- YTD
- -45.56%
- 1Y
- -60.18%
- 3Y*
- -44.32%
- 5Y*
- -22.80%
- 10Y*
- —
- ALL TIME*
- 9.10%
VOO
- 1D
- 0.71%
- 1M
- 0.26%
- 6M
- 8.58%
- YTD
- 10.16%
- 1Y
- 21.58%
- 3Y*
- 19.42%
- 5Y*
- 12.83%
- 10Y*
- 15.14%
- ALL TIME*
- 14.78%
Liquidity Comparison
| Position | Avg. Volume Value (2W) | Avg. Volume Value (1M) | Avg. Volume Value (3M) |
|---|---|---|---|
| $40.00M | $44.43M | $52.50M | |
| $3.82B | $3.78B | $5.44B |
INSP vs. VOO - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | |
|---|---|---|---|---|---|---|---|---|---|
INSP Inspire Medical Systems, Inc. | -45.56% | -50.25% | -8.87% | -19.24% | 9.48% | 22.31% | 153.46% | 75.64% | 72.52% |
VOO Vanguard S&P 500 ETF | 10.16% | 17.82% | 24.98% | 26.32% | -18.17% | 28.79% | 18.32% | 31.37% | -3.56% |
Correlation
The correlation between INSP and VOO is 0.18, which is low. Their historical price movements had little consistent relationship.
| Correlation | |
|---|---|
Correlation (1Y) Focuses on recent behavior, but can change the most. | 0.18 |
Correlation (3Y) Balances recent behavior with more history. | 0.30 |
Correlation (5Y) Shows whether the relationship held over a longer period. | 0.41 |
Correlation (All Time) Calculated using the full available price history since May 3, 2018 | 0.41 |
Over the past year, the correlation between INSP and VOO has dropped to 0.18 - well below their long-term average of 0.41, suggesting their price drivers have been diverging.
Compare stocks, funds, or ETFs
Search for stocks, ETFs, and funds for a quick comparison or use the comparison tool for more options.
Return for Risk
INSP vs. VOO — Risk / Return Rank
INSP
VOO
INSP vs. VOO - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for Inspire Medical Systems, Inc. (INSP) and Vanguard S&P 500 ETF (VOO). 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 | VOO | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | -2.33 | ||
| Sortino ratioReturn per unit of downside risk | -3.21 | ||
| Omega ratioGain probability vs. loss probability | 0.85 | 1.28 | -0.43 |
| Calmar ratioReturn relative to maximum drawdown | -0.83 | 2.21 | -3.04 |
| Martin ratioReturn relative to average drawdown | -1.17 | 9.44 | -10.60 |
Loading charts...
Drawdowns
INSP vs. VOO - Drawdown Comparison
The maximum INSP drawdown since its inception was -87.72%, which is greater than VOO's maximum drawdown of -33.99%. Use the drawdown chart below to compare losses from any high point for INSP and VOO.
Loading charts...
Drawdown Indicators
| INSP | VOO | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -87.72% | -33.99% | -53.73% |
Max Drawdown (1Y)Largest decline over 1 year | -72.19% | -8.90% | -63.29% |
Max Drawdown (3Y)Largest decline over 3 years | -85.91% | -18.69% | -67.22% |
Max Drawdown (5Y)Largest decline over 5 years | -87.72% | -24.52% | -63.20% |
Max Drawdown (10Y)Largest decline over 10 years | — | -33.99% | — |
Current DrawdownCurrent decline from peak | -84.60% | -1.38% | -83.22% |
Average DrawdownAverage peak-to-trough decline | -28.68% | -3.67% | -25.01% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 51.14% | 2.08% | +49.06% |
Volatility
INSP vs. VOO - Volatility Comparison
Inspire Medical Systems, Inc. (INSP) has a higher volatility of 13.40% compared to Vanguard S&P 500 ETF (VOO) at 3.54%. This indicates that INSP's price experiences larger fluctuations and is considered to be riskier than VOO based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
Loading charts...
Volatility by Period
| INSP | VOO | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 13.40% | 3.54% | +9.86% |
Volatility (6M)Calculated over the trailing 6-month period | 39.42% | 10.10% | +29.32% |
Volatility (1Y)Calculated over the trailing 1-year period | 75.49% | 12.82% | +62.67% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 60.26% | 16.93% | +43.33% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 60.30% | 18.01% | +42.29% |
Dividends
INSP vs. VOO - Dividend Comparison
INSP has not paid dividends to shareholders, while VOO's dividend yield for the trailing twelve months is around 1.07%.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
INSP Inspire Medical Systems, Inc. | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% |
VOO Vanguard S&P 500 ETF | 1.07% | 1.13% | 1.24% | 1.46% | 1.69% | 1.25% | 1.54% | 1.88% | 2.06% | 1.78% | 2.02% | 2.10% |
Frequently Asked Questions
INSP and VOO have a correlation of 0.18, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
INSP has higher volatility (13.40%) compared to VOO (3.54%). In terms of maximum drawdown, INSP dropped -87.72% vs VOO's -33.99%.
VOO currently has the higher Sharpe Ratio (1.53 vs -0.79), 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.
Find the right allocation for INSP and VOO
Add both to a portfolio and optimize allocations for your target — whether that's maximizing returns, minimizing drawdowns, or balancing risk across holdings.
Open Portfolio Optimizer