PE Ratio: 21.65

Basis: Latest stored market observation. Source: stored company filings and market data; unavailable inputs remain N/A.

Is the P/E ratio high or low?

The P/E ratio of 21.65 is 16% above its 5-year average of 18.72, around the middle of its 5-year range (10.13–29.56).

As of Sunday, July 26, 2026. 23.07% above its 12-month average of 17.59.

PE Ratio (21.65) = Close Price ($202.19) / Diluted TTM EPS ($9.34)

BIIB PE Ratio Metrics

P/E vs. its own history

At 21.6, P/E is in its normal range, sitting higher than 58% of its 20-year history.

P/E Comparison

PE Ratio Formula & Definition

PE Ratio = Share Price / Diluted EPS (TTM)

The price-to-earnings ratio measures how much investors pay for each dollar of trailing earnings. A lower PE can indicate a cheaper valuation; a higher PE implies higher growth expectations.

Expanded definitions: Investopedia, Wikipedia, Corporate Finance Institute

PE Ratio FAQ

What is the P/E ratio for Biogen Inc. (BIIB)?

The P/E ratio for BIIB stock is 21.65.

Is Biogen Inc.'s P/E ratio high or low?

The P/E ratio of 21.65 is 16% above its 5-year average of 18.72, around the middle of its 5-year range (10.13–29.56).

What is the TTM average P/E ratio for Biogen Inc. (BIIB)?

The TTM average P/E ratio for BIIB stock is 17.59.

What is the 3Y average P/E ratio for Biogen Inc. (BIIB)?

The 3Y average P/E ratio for BIIB stock is 18.82.

What is the 5Y average P/E ratio for Biogen Inc. (BIIB)?

The 5Y average P/E ratio for BIIB stock is 18.72.

What is the 10Y average P/E ratio for Biogen Inc. (BIIB)?

The 10Y average P/E ratio for BIIB stock is 16.97.

What is the 15Y average P/E ratio for Biogen Inc. (BIIB)?

The 15Y average P/E ratio for BIIB stock is 20.64.

What is the 20Y average P/E ratio for Biogen Inc. (BIIB)?

The 20Y average P/E ratio for BIIB stock is 20.96.

Showing the most recent 260 of 5,032 data points. The chart above shows the full history.

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