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 4.24%/yr vs 15.08%/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 -12.47% return, which is significantly lower than SPY's 10.45% return. Over the past 10 years, POST has underperformed SPY with an annualized return of 4.24%, while SPY has yielded a comparatively higher 15.08% annualized return.
POST
- 1D
- 0.49%
- 1M
- -6.91%
- 6M
- -11.63%
- YTD
- -12.47%
- 1Y
- -18.98%
- 3Y*
- 0.10%
- 5Y*
- 4.58%
- 10Y*
- 4.24%
SPY
- 1D
- -0.77%
- 1M
- 1.26%
- 6M
- 8.34%
- YTD
- 10.45%
- 1Y
- 21.46%
- 3Y*
- 20.07%
- 5Y*
- 12.94%
- 10Y*
- 15.08%
POST vs. SPY - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
POST Post Holdings, Inc. | -12.47% | -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 | 10.45% | 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 -0.03, 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 | -0.03 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.13 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.26 |
Correlation (10Y) Calculated over the trailing 10-year period | 0.35 |
Correlation (All Time) Calculated using the full available price history since Jan 27, 2012 | 0.38 |
The correlation between POST and SPY shifts across timeframes, from -0.03 (1 year) to 0.38 (all time), reflecting how their relationship changes across market environments.
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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 | -2.42 | ||
| Sortino ratioReturn per unit of downside risk | -3.28 | ||
| Omega ratioGain probability vs. loss probability | 0.89 | 1.31 | -0.42 |
| Calmar ratioReturn relative to maximum drawdown | -0.73 | 2.43 | -3.16 |
| Martin ratioReturn relative to average drawdown | -1.60 | 10.57 | -12.17 |
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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 | -26.10% | -8.88% | -17.22% |
Max Drawdown (3Y)Largest decline over 3 years | -29.84% | -18.76% | -11.08% |
Max Drawdown (5Y)Largest decline over 5 years | -29.84% | -24.50% | -5.34% |
Max Drawdown (10Y)Largest decline over 10 years | -36.56% | -33.72% | -2.84% |
Current DrawdownCurrent decline from peak | -28.18% | -1.12% | -27.06% |
Average DrawdownAverage peak-to-trough decline | -9.54% | -9.02% | -0.52% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 11.92% | 2.03% | +9.89% |
Volatility
POST vs. SPY - Volatility Comparison
Post Holdings, Inc. (POST) has a higher volatility of 9.47% compared to State Street SPDR S&P 500 ETF (SPY) at 4.26%. 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 | 9.47% | 4.26% | +5.21% |
Volatility (6M)Calculated over the trailing 6-month period | 20.43% | 10.01% | +10.42% |
Volatility (1Y)Calculated over the trailing 1-year period | 27.03% | 12.60% | +14.43% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 22.76% | 17.17% | +5.59% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 24.17% | 17.93% | +6.24% |
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 1.00%.
| 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 | 1.00% | 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 -0.03, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
POST has higher volatility (9.47%) compared to SPY (4.26%). In terms of maximum drawdown, POST dropped -47.37% vs SPY's -55.19%.
SPY currently has the higher Sharpe Ratio (1.71 vs -0.71), 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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