Merck & Co Inc Market Cap

Data as of August 04, 2026

How It's Calculated

What This Means

Merck & Co Inc has a market capitalization of $321.57B, classifying it as Mega Cap — one of the largest companies in the world. Market cap represents the total value of all outstanding shares and is a key indicator of a company's size.

About Merck & Co Inc

Merck & Co Inc (MRK) operates in the Pharmaceuticals sector, specifically in Pharmaceuticals. With a market capitalization of about $321.57B, it ranks as a mega-cap stock — one of the largest publicly traded companies.

Shares recently traded near $127.77, within a 52-week range of $77.53 to $135.05 (-5.4% from the high, +64.8% from the low). Beta of 0.21 indicates relatively lower volatility versus the market.

Trailing profit margin is about 13.6%, signaling a solid profit margin for its industry.

Understanding This Metric

Market capitalization sums the market value of all outstanding shares. It helps classify Merck & Co Inc by size — mega-cap, large-cap, and mid-cap stocks tend to have different liquidity, volatility, and index inclusion profiles. Size alone does not determine quality, but it frames risk and how widely the stock is held.

Sector Comparison

Among Pharmaceuticals names on our S&P 100 coverage, Merck & Co Inc's market cap of $321.57B can be compared with peers such as LLY ($1.08T), JNJ ($617.78B), PFE ($142.54B). Sector context helps interpretation, but each company's growth profile and balance sheet differ — use multiple metrics before drawing conclusions. View all Pharmaceuticals stocks.

Key Takeaways

• MRK is grouped in the Pharmaceuticals sector for peer comparisons.
• Recent beta of 0.21 suggests lower-than-market price sensitivity.
• Trailing profit margin of 13.6% provides context for how much earnings support the headline multiple.

Related Tools & Guides

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