Biogen (BIIB) Market Cap 2004–2025

As of December 12, 2025, Biogen had a market cap of $25.540 billion, which increased by 0.91% compared to the previous trading day. Market capitalization, often referred to as market cap, represents the total value of a company's outstanding shares on the stock market and is a common measure of its overall size and valuation.

Data updated: Dec 12, 2025, 4:00 PM ET
Biogen logo

Biogen Inc. (BIIB)

🌍 United States 📈 NASDAQ 🏭 Health Care 🏢 Biotechnology
Latest Market Cap
$25.540B ▲ 0.91%
Jan 1, 2025
$22.284B ▲ 14.61%
1 Year Ago
$21.862B ▲ 16.82%
All-Time High
$102.859B ▼ 75.17%


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Note: Each point on the chart represents the market capitalization at the end of the trading day.
Source: Data compiled from EDGAR filings, Bloomberg and Yahoo Finance.


📈 Biogen Market Cap History by Year and Month

Biogen Market Cap History by Year and Month
Year / MonthMarket Cap% Change
2025$25.540B▲ 14.61%
$25.540B▼ 4.38%
$26.710B▲ 18.03%
$22.630B▲ 10.18%
$20.540B▲ 5.93%
$19.390B▲ 3.30%
$18.770B▲ 2.01%
$18.400B▼ 3.26%
$19.020B▲ 7.22%
$17.740B▼ 11.52%
$20.050B▼ 2.53%
$20.570B▼ 1.91%
$20.970B▼ 5.90%
2024$22.284B▼ 40.57%
2023$37.496B▼ 5.97%
2022$39.876B▲ 13.07%
2021$35.268B▼ 5.49%

All market cap values reflect closing prices for the period shown.


📊 Biogen Market Cap and Other Industry Peers

Below are selected companies from the Biotechnology sector / subsector:

  1. $52.52B
  2. $42.02B
  3. $32.35B
  4. $25.54B
  5. $21.27B
  6. $19.23B
  7. $18.73B
  8. $15.37B
  9. $15.24B
  10. $14.48B
  11. $13.09B
  12. $13.08B
  13. $11.51B
  14. $10.96B
  15. $10.24B
  16. $4.19B
  17. $3.54B
  18. $3.50B
  19. $3.19B
  20. $2.26B

Data reflect the most recent market capitalization values available.

💡 What Is Market Capitalization and How Do We Calculate It?

For Biogen Inc. (BIIB), market capitalization represents the total market value of the company’s publicly traded shares. It helps investors understand Biogen’s size within the health care sector and compare it with other companies in the same industry.

In most cases, market capitalization is calculated by multiplying the current share price by the number of basic shares outstanding. Basic shares represent the actual number of common shares that currently exist, without including potential future shares from employee stock options, RSUs, warrants, or convertible securities. For example, if Biogen had one million basic shares and each traded at $50, its market capitalization would be $50 million.

Formula:
Market Cap = Share Price × Shares Outstanding

The value of Biogen’s market capitalization changes throughout the trading day because it mainly depends on the current share price. The number of shares outstanding typically remains stable unless the company issues new shares, buys back its own stock, or grants stock options to employees.

Based on the latest data, Biogen had a market capitalization of $25.540 billion, placing it in the large-cap category within the health care industry.

Disclaimer: Despite all efforts, there may still be minor inaccuracies present in the data.