MRK vs. PFE

Last updated Apr 1, 2026

Compare and contrast key facts about Merck & Co., Inc. (MRK) and Pfizer Inc. (PFE).

Performance

MRK vs. PFE - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Merck & Co., Inc. (MRK) and Pfizer Inc. (PFE). The values are adjusted to include any dividend payments, if applicable.

MRK vs. PFE - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
MRK Merck & Co., Inc.	15.13%	9.79%	-6.26%	1.01%	49.42%	1.75%	-7.20%	22.27%	39.95%	-1.49%
PFE Pfizer Inc.	14.66%	0.65%	-2.22%	-41.26%	-10.41%	66.70%	3.07%	-6.91%	24.82%	15.90%

Fundamentals

Market Cap MRK : $299.28B PFE : $159.66B
EPS MRK : $7.30 PFE : $1.36
PE Ratio MRK : 16.47 PFE : 20.61
PEG Ratio MRK : 0.01 PFE : 0.37
PS Ratio MRK : 4.63 PFE : 2.56
PB Ratio MRK : 5.77 PFE : 1.72
Total Revenue (TTM) MRK : $65.01B PFE : $62.58B
Gross Profit (TTM) MRK : $52.98B PFE : $44.01B
EBITDA (TTM) MRK : $28.80B PFE : $15.10B

Returns By Period

The year-to-date returns for both stocks are quite close, with MRK having a 15.13% return and PFE slightly lower at 14.66%. Over the past 10 years, MRK has outperformed PFE with an annualized return of 12.31%, while PFE has yielded a comparatively lower 4.32% annualized return.

MRK

• 1D: 1.85%
• 1M: -2.13%
• YTD: 15.13%
• 6M: 45.62%
• 1Y: 38.88%
• 3Y*: 7.42%
• 5Y*: 13.86%
• 10Y*: 12.31%

PFE

• 1D: 1.12%
• 1M: 1.56%
• YTD: 14.66%
• 6M: 14.02%
• 1Y: 18.86%
• 3Y*: -6.22%
• 5Y*: -0.14%
• 10Y*: 4.32%

*Multi-year figures are annualized to reflect compound growth (CAGR)

Return for Risk

MRK vs. PFE — Risk / Return Rank

Compare risk-adjusted metric ranks to identify better-performing investments over the past 12 months.

MRK

MRK Risk / Return Rank: 79
MRK Sharpe Ratio Rank: 82
MRK Sortino Ratio Rank: 78
MRK Omega Ratio Rank: 76
MRK Calmar Ratio Rank: 80
MRK Martin Ratio Rank: 79

PFE

PFE Risk / Return Rank: 65
PFE Sharpe Ratio Rank: 67
PFE Sortino Ratio Rank: 61
PFE Omega Ratio Rank: 59
PFE Calmar Ratio Rank: 69
PFE Martin Ratio Rank: 69

The rank (0–100) shows how this investment's returns compare to the risk taken. Higher = better. Based on the past 12 months of data, combining Sharpe, Sortino, and other metrics used by quantitative funds and institutional investors.

MRK vs. PFE - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Merck & Co., Inc. (MRK) and Pfizer Inc. (PFE). 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.

	MRK	PFE	Difference
Sharpe ratio Return per unit of total volatility	1.34	0.71	+0.64
Sortino ratio Return per unit of downside risk	1.96	1.17	+0.79
Omega ratio Gain probability vs. loss probability	1.25	1.15	+0.10
Calmar ratio Return relative to maximum drawdown	2.19	1.32	+0.87
Martin ratio Return relative to average drawdown	5.34	3.18	+2.16
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

MRK vs. PFE - Sharpe Ratio Comparison

The current MRK Sharpe Ratio is 1.34, which is higher than the PFE Sharpe Ratio of 0.71. The chart below compares the historical Sharpe Ratios of MRK and PFE, offering insights into how both investments have performed under varying market conditions. These values are calculated using daily returns over the previous 12 months.

Sharpe Ratios by Period

	MRK	PFE	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.34	0.71	+0.64
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.60	-0.01	+0.60
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.54	0.18	+0.36
Sharpe Ratio (All Time) Calculated using the full available price history	0.49	0.26	+0.22

Correlation

The correlation between MRK and PFE is 0.52, which is considered to be moderate. This suggests that the two assets have some degree of positive relationship in their price movements. Moderate correlation can be acceptable for portfolio diversification, offering a balance between risk and potential returns.

Dividends

MRK vs. PFE - Dividend Comparison

MRK's dividend yield for the trailing twelve months is around 2.76%, less than PFE's 6.13% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
MRK Merck & Co., Inc.	2.76%	3.12%	3.14%	2.72%	2.52%	3.41%	3.03%	2.48%	2.60%	3.36%	3.14%	3.43%
PFE Pfizer Inc.	6.13%	6.91%	6.33%	5.70%	3.12%	2.64%	3.92%	3.68%	3.12%	3.53%	3.69%	3.47%

Drawdowns

MRK vs. PFE - Drawdown Comparison

The maximum MRK drawdown since its inception was -68.61%, which is greater than PFE's maximum drawdown of -58.96%. Use the drawdown chart below to compare losses from any high point for MRK and PFE.

Drawdown Indicators

	MRK	PFE	Difference
Max Drawdown Largest peak-to-trough decline	-68.61%	-58.96%	-9.65%
Max Drawdown (1Y) Largest decline over 1 year	-15.67%	-12.59%	-3.08%
Max Drawdown (5Y) Largest decline over 5 years	-43.44%	-58.96%	+15.52%
Max Drawdown (10Y) Largest decline over 10 years	-43.44%	-58.96%	+15.52%
Current Drawdown Current decline from peak	-4.04%	-42.75%	+38.71%
Average Drawdown Average peak-to-trough decline	-18.89%	-17.33%	-1.56%
Ulcer Index Depth and duration of drawdowns from previous peaks	7.44%	6.13%	+1.31%

Volatility

MRK vs. PFE - Volatility Comparison

The current volatility for Merck & Co., Inc. (MRK) is 5.85%, while Pfizer Inc. (PFE) has a volatility of 6.75%. This indicates that MRK experiences smaller price fluctuations and is considered to be less risky than PFE based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MRK	PFE	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.85%	6.75%	-0.90%
Volatility (6M) Calculated over the trailing 6-month period	19.79%	18.50%	+1.29%
Volatility (1Y) Calculated over the trailing 1-year period	29.08%	26.73%	+2.35%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	23.30%	25.46%	-2.16%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	22.68%	23.90%	-1.22%

Financials

MRK vs. PFE - Profitability Comparison

The chart below illustrates the profitability comparison between Merck & Co., Inc. and Pfizer Inc. over time, highlighting three key metrics: Gross Profit Margin, Operating Margin, and Net Profit Margin.

MRK - Gross Margin

Gross margin is calculated as gross profit divided by revenue. For the three months ending on Apr 2026, Merck & Co., Inc. reported a gross profit of 15.20B and revenue of 16.40B. Therefore, the gross margin over that period was 92.7%.

PFE - Gross Margin

Gross margin is calculated as gross profit divided by revenue. For the three months ending on Apr 2026, Pfizer Inc. reported a gross profit of 12.29B and revenue of 17.56B. Therefore, the gross margin over that period was 70.0%.

MRK - Operating Margin

Operating margin is calculated as operating income divided by revenue. For the three months ending on Apr 2026, Merck & Co., Inc. reported an operating income of 8.74B and revenue of 16.40B, resulting in an operating margin of 53.3%.

PFE - Operating Margin

Operating margin is calculated as operating income divided by revenue. For the three months ending on Apr 2026, Pfizer Inc. reported an operating income of 3.69B and revenue of 17.56B, resulting in an operating margin of 21.0%.

MRK - Net Margin

Net margin is calculated as net income divided by revenue. For the three months ending on Apr 2026, Merck & Co., Inc. reported a net income of 2.96B and revenue of 16.40B, resulting in a net margin of 18.1%.

PFE - Net Margin

Net margin is calculated as net income divided by revenue. For the three months ending on Apr 2026, Pfizer Inc. reported a net income of -1.65B and revenue of 17.56B, resulting in a net margin of -9.4%.