POST vs. SPY
POST (Post Holdings, Inc.) is a stock, while SPY (State Street SPDR S&P 500 ETF) is S&P 500 fund tracking the S&P 500 Index. Over the past 10 years, POST returned 5.59%/yr vs 15.70%/yr for SPY. At a 0.38 correlation, their price movements are largely independent.
Performance
POST vs. SPY - Performance Comparison
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Returns By Period
In the year-to-date period, POST achieves a -12.49% return, which is significantly lower than SPY's 9.74% return. Over the past 10 years, POST has underperformed SPY with an annualized return of 5.59%, while SPY has yielded a comparatively higher 15.70% annualized return.
POST
- 1D
- -1.96%
- 1M
- -10.80%
- YTD
- -12.49%
- 6M
- -14.18%
- 1Y
- -22.95%
- 3Y*
- 0.62%
- 5Y*
- 4.27%
- 10Y*
- 5.59%
SPY
- 1D
- -0.31%
- 1M
- 0.09%
- YTD
- 9.74%
- 6M
- 9.27%
- 1Y
- 26.65%
- 3Y*
- 21.27%
- 5Y*
- 13.51%
- 10Y*
- 15.70%
POST vs. SPY - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
POST Post Holdings, Inc. | -12.49% | -13.46% | 29.98% | -2.44% | 22.34% | 11.60% | -7.42% | 22.41% | 12.50% | -1.44% |
SPY State Street SPDR S&P 500 ETF | 9.74% | 17.72% | 24.89% | 26.18% | -18.18% | 28.73% | 18.33% | 31.22% | -4.57% | 21.71% |
Correlation
The correlation between POST and SPY is 0.00, meaning there is essentially no relationship between their price movements. Each responds to its own set of market drivers, making them strong candidates for combining in a diversified portfolio.
| Correlation | |
|---|---|
Correlation (1Y) Calculated over the trailing 1-year period | 0.00 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.15 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.27 |
Correlation (10Y) Calculated over the trailing 10-year period | 0.36 |
Correlation (All Time) Calculated using the full available price history since Jan 27, 2012 | 0.38 |
Over the past year, the correlation between POST and SPY has dropped to 0.00 - well below their long-term average of 0.38, suggesting their price drivers have been diverging.
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Return for Risk
POST vs. SPY — Risk / Return Rank
POST
SPY
POST vs. SPY - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for Post Holdings, Inc. (POST) and State Street SPDR S&P 500 ETF (SPY). 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.
| POST | SPY | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | -3.03 | ||
| Sortino ratioReturn per unit of downside risk | -4.13 | ||
| Omega ratioGain probability vs. loss probability | 0.86 | 1.39 | -0.53 |
| Calmar ratioReturn relative to maximum drawdown | -0.95 | 3.01 | -3.96 |
| Martin ratioReturn relative to average drawdown | -2.13 | 13.54 | -15.66 |
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Drawdowns
POST vs. SPY - Drawdown Comparison
The maximum POST drawdown since its inception was -47.37%, smaller than the maximum SPY drawdown of -55.19%. Use the drawdown chart below to compare losses from any high point for POST and SPY.
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Drawdown Indicators
| POST | SPY | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -47.37% | -55.19% | +7.82% |
Max Drawdown (1Y)Largest decline over 1 year | -24.37% | -8.88% | -15.49% |
Max Drawdown (3Y)Largest decline over 3 years | -28.20% | -18.76% | -9.44% |
Max Drawdown (5Y)Largest decline over 5 years | -28.20% | -24.50% | -3.70% |
Max Drawdown (10Y)Largest decline over 10 years | -36.56% | -33.72% | -2.84% |
Current DrawdownCurrent decline from peak | -28.20% | -1.75% | -26.45% |
Average DrawdownAverage peak-to-trough decline | -9.48% | -9.04% | -0.44% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 10.81% | 1.97% | +8.84% |
Volatility
POST vs. SPY - Volatility Comparison
Post Holdings, Inc. (POST) has a higher volatility of 8.47% compared to State Street SPDR S&P 500 ETF (SPY) at 4.64%. This indicates that POST's price experiences larger fluctuations and is considered to be riskier than SPY based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| POST | SPY | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 8.47% | 4.64% | +3.83% |
Volatility (6M)Calculated over the trailing 6-month period | 19.28% | 9.75% | +9.53% |
Volatility (1Y)Calculated over the trailing 1-year period | 26.31% | 12.43% | +13.88% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 22.53% | 17.14% | +5.39% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 24.10% | 17.99% | +6.11% |
Dividends
POST vs. SPY - Dividend Comparison
POST has not paid dividends to shareholders, while SPY's dividend yield for the trailing twelve months is around 1.01%.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
POST Post Holdings, 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% |
SPY State Street SPDR S&P 500 ETF | 1.01% | 1.07% | 1.21% | 1.40% | 1.65% | 1.20% | 1.52% | 1.75% | 2.04% | 1.80% | 2.03% | 2.06% |
Frequently Asked Questions
POST and SPY have a correlation of 0.00, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
POST has higher volatility (8.47%) compared to SPY (4.64%). In terms of maximum drawdown, POST dropped -47.37% vs SPY's -55.19%.
SPY currently has the higher Sharpe Ratio (2.16 vs -0.88), 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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