PFE vs. DUOL
PFE (Pfizer Inc.) and DUOL (Duolingo, Inc.) are both stocks. PFE operates in Drug Manufacturers - General (Healthcare), while DUOL operates in Software - Application (Technology). Over the past 3 years, PFE returned -7.78%/yr vs -8.39%/yr for DUOL. At a 0.05 correlation, their price movements are largely independent.
Performance
PFE vs. DUOL - Performance Comparison
Loading charts...
Returns By Period
In the year-to-date period, PFE achieves a 8.79% return, which is significantly higher than DUOL's -30.13% return.
PFE
- 1D
- 0.15%
- 1M
- 1.79%
- YTD
- 8.79%
- 6M
- 4.79%
- 1Y
- 14.27%
- 3Y*
- -7.78%
- 5Y*
- -3.35%
- 10Y*
- 2.11%
DUOL
- 1D
- -0.98%
- 1M
- 12.34%
- YTD
- -30.13%
- 6M
- -37.52%
- 1Y
- -74.37%
- 3Y*
- -8.39%
- 5Y*
- —
- 10Y*
- —
PFE vs. DUOL - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | |
|---|---|---|---|---|---|---|
PFE Pfizer Inc. | 8.79% | 0.65% | -2.22% | -41.26% | -10.41% | 42.77% |
DUOL Duolingo, Inc. | -30.13% | -45.87% | 42.93% | 218.92% | -32.97% | -24.96% |
Correlation
The correlation between PFE and DUOL is -0.04, 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 | -0.04 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.01 |
Correlation (All Time) Calculated using the full available price history since Jul 28, 2021 | 0.05 |
Fundamentals
PFE:
$1.31
DUOL:
$11.67
PFE:
19.98
DUOL:
10.51
PFE:
0.36
DUOL:
0.03
PFE:
2.36
DUOL:
4.04
PFE:
$63.32B
DUOL:
$1.10B
PFE:
$43.91B
DUOL:
$798.46M
PFE:
$16.94B
DUOL:
$167.30M
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
PFE vs. DUOL — Risk / Return Rank
PFE
DUOL
PFE vs. DUOL - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for Pfizer Inc. (PFE) and Duolingo, Inc. (DUOL). 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.
| PFE | DUOL | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | +1.73 | ||
| Sortino ratioReturn per unit of downside risk | +3.30 | ||
| Omega ratioGain probability vs. loss probability | 1.12 | 0.72 | +0.40 |
| Calmar ratioReturn relative to maximum drawdown | 1.13 | -0.92 | +2.05 |
| Martin ratioReturn relative to average drawdown | 2.27 | -1.26 | +3.53 |
Loading charts...
Drawdowns
PFE vs. DUOL - Drawdown Comparison
The maximum PFE drawdown since its inception was -69.24%, smaller than the maximum DUOL drawdown of -83.35%. Use the drawdown chart below to compare losses from any high point for PFE and DUOL.
Loading charts...
Drawdown Indicators
| PFE | DUOL | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -69.24% | -83.35% | +14.11% |
Max Drawdown (1Y)Largest decline over 1 year | -11.47% | -81.19% | +69.72% |
Max Drawdown (3Y)Largest decline over 3 years | -40.43% | -83.35% | +42.92% |
Max Drawdown (5Y)Largest decline over 5 years | -58.96% | — | — |
Max Drawdown (10Y)Largest decline over 10 years | -58.96% | — | — |
Current DrawdownCurrent decline from peak | -45.68% | -77.32% | +31.64% |
Average DrawdownAverage peak-to-trough decline | -22.90% | -35.76% | +12.86% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 5.70% | 59.48% | -53.78% |
Volatility
PFE vs. DUOL - Volatility Comparison
The current volatility for Pfizer Inc. (PFE) is 5.07%, while Duolingo, Inc. (DUOL) has a volatility of 15.67%. This indicates that PFE experiences smaller price fluctuations and is considered to be less risky than DUOL based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
Loading charts...
Volatility by Period
| PFE | DUOL | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 5.07% | 15.67% | -10.60% |
Volatility (6M)Calculated over the trailing 6-month period | 14.62% | 40.94% | -26.32% |
Volatility (1Y)Calculated over the trailing 1-year period | 23.84% | 62.97% | -39.13% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 25.48% | 66.21% | -40.73% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 23.89% | 66.21% | -42.32% |
Dividends
PFE vs. DUOL - Dividend Comparison
PFE's dividend yield for the trailing twelve months is around 6.56%, while DUOL has not paid dividends to shareholders.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
DUOL Duolingo, 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% |
PFE Pfizer Inc. | 6.56% | 6.91% | 6.33% | 5.70% | 3.12% | 2.64% | 3.92% | 3.68% | 3.12% | 3.53% | 3.69% | 3.47% |
Financials
PFE vs. DUOL - Financials Comparison
This section allows you to compare key financial metrics between Pfizer Inc. and Duolingo, Inc.. You can select fields from income statements, balance sheets, and cash flow statements to easily visualize and compare the financial health of both companies.
Total Revenue: Total amount of money received from sales and other business activities
PFE vs. DUOL - Profitability Comparison
PFE - Gross Margin
Gross margin is calculated as gross profit divided by revenue. For the three months ending on Jun 2026, Pfizer Inc. reported a gross profit of 9.72B and revenue of 14.45B. Therefore, the gross margin over that period was 67.3%.
DUOL - Gross Margin
Gross margin is calculated as gross profit divided by revenue. For the three months ending on Jun 2026, Duolingo, Inc. reported a gross profit of 213.10M and revenue of 291.97M. Therefore, the gross margin over that period was 73.0%.
PFE - Operating Margin
Operating margin is calculated as operating income divided by revenue. For the three months ending on Jun 2026, Pfizer Inc. reported an operating income of 4.03B and revenue of 14.45B, resulting in an operating margin of 27.9%.
DUOL - Operating Margin
Operating margin is calculated as operating income divided by revenue. For the three months ending on Jun 2026, Duolingo, Inc. reported an operating income of 44.53M and revenue of 291.97M, resulting in an operating margin of 15.3%.
PFE - Net Margin
Net margin is calculated as net income divided by revenue. For the three months ending on Jun 2026, Pfizer Inc. reported a net income of 2.69B and revenue of 14.45B, resulting in a net margin of 18.6%.
DUOL - Net Margin
Net margin is calculated as net income divided by revenue. For the three months ending on Jun 2026, Duolingo, Inc. reported a net income of 43.46M and revenue of 291.97M, resulting in a net margin of 14.9%.
Frequently Asked Questions
PFE and DUOL have a correlation of -0.04, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
DUOL has higher volatility (15.67%) compared to PFE (5.07%). In terms of maximum drawdown, PFE dropped -69.24% vs DUOL's -83.35%.
PFE currently has the higher Sharpe Ratio (0.54 vs -1.19), 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 PFE and DUOL
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