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 5.07%/yr vs 15.07%/yr for SPY. Their 0.37 correlation means their historical movements had little consistent relationship.
Performance
POST vs. SPY - Performance Comparison
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Returns By Period
In the year-to-date period, POST achieves a -7.71% return, which is significantly lower than SPY's 10.13% return. Over the past 10 years, POST has underperformed SPY with an annualized return of 5.07%, while SPY has yielded a comparatively higher 15.07% annualized return.
POST
- 1D
- -1.67%
- 1M
- -1.48%
- 6M
- -10.65%
- YTD
- -7.71%
- 1Y
- -13.39%
- 3Y*
- 2.61%
- 5Y*
- 6.42%
- 10Y*
- 5.07%
- ALL TIME*
- 12.98%
SPY
- 1D
- 0.72%
- 1M
- 0.30%
- 6M
- 8.53%
- YTD
- 10.13%
- 1Y
- 21.49%
- 3Y*
- 19.32%
- 5Y*
- 12.76%
- 10Y*
- 15.07%
- ALL TIME*
- 10.79%
Liquidity Comparison
| Position | Avg. Volume Value (2W) | Avg. Volume Value (1M) | Avg. Volume Value (3M) |
|---|---|---|---|
| $78.12M | $77.42M | $81.59M | |
| $37.27B | $35.99B | $39.23B |
POST vs. SPY - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
POST Post Holdings, Inc. | -7.71% | -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 | 10.13% | 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 -0.06, meaning there was essentially no consistent relationship between their historical price movements. Each responded to its own set of market drivers.
| Correlation | |
|---|---|
Correlation (1Y) Focuses on recent behavior, but can change the most. | -0.06 |
Correlation (3Y) Balances recent behavior with more history. | 0.12 |
Correlation (5Y) Shows whether the relationship held over a longer period. | 0.25 |
Correlation (10Y) Provides a long-term view across more market conditions. | 0.34 |
Correlation (All Time) Calculated using the full available price history since Jan 27, 2012 | 0.37 |
The correlation between POST and SPY shifts across timeframes, from -0.06 (1 year) to 0.37 (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 | -2.01 | ||
| Sortino ratioReturn per unit of downside risk | -2.65 | ||
| Omega ratioGain probability vs. loss probability | 0.94 | 1.27 | -0.34 |
| Calmar ratioReturn relative to maximum drawdown | -0.52 | 2.20 | -2.73 |
| Martin ratioReturn relative to average drawdown | -1.05 | 9.40 | -10.45 |
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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 | -24.28% | -1.40% | -22.88% |
Average DrawdownAverage peak-to-trough decline | -9.60% | -9.01% | -0.59% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 12.95% | 2.08% | +10.87% |
Volatility
POST vs. SPY - Volatility Comparison
Post Holdings, Inc. (POST) has a higher volatility of 11.07% compared to State Street SPDR S&P 500 ETF (SPY) at 3.58%. 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 | 11.07% | 3.58% | +7.49% |
Volatility (6M)Calculated over the trailing 6-month period | 21.93% | 10.14% | +11.79% |
Volatility (1Y)Calculated over the trailing 1-year period | 28.08% | 12.89% | +15.19% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 23.03% | 17.18% | +5.85% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 24.29% | 17.95% | +6.34% |
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 -0.06, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
POST has higher volatility (11.07%) compared to SPY (3.58%). In terms of maximum drawdown, POST dropped -47.37% vs SPY's -55.19%.
SPY currently has the higher Sharpe Ratio (1.52 vs -0.49), 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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