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Biogen Inc.. (BIIB) Stock Fundamental Analysis & AI Rating 2026

BIIB Nasdaq Biological Products, (No Diagnostic Substances) DE CIK: 0000875045
Updated This Month • Analysis: Mar 21, 2026 • SEC Data: 2025-12-31
Combined AI Rating
HOLD
68% Confidence
STRONG AGREEMENT
HOLD
62% Conf
HOLD
74% Conf

📊 BIIB Key Takeaways

Revenue: $9.9B
Net Margin: 13.1%
Free Cash Flow: $2.1B
Current Ratio: 2.68x
Debt/Equity: 0.34x
EPS: $8.79
AI Rating: HOLD with 62% confidence
Biogen Inc.. (BIIB) receives a HOLD rating with 68% confidence from our AI fundamental analysis based on SEC 10-K filings. With revenue of $9.9B, net profit margin of 13.1%, and return on equity (ROE) of 7.1%, Biogen Inc.. demonstrates mixed fundamentals in the Healthcare sector. Below is our complete BIIB stock analysis for 2026.

Is Biogen Inc.. (BIIB) a Good Investment?

Claude

Biogen demonstrates solid operational profitability with 15.7% operating margin and strong free cash flow generation ($2.1B), supported by a healthy balance sheet with 2.68x current ratio and manageable 0.34x debt-to-equity. However, revenue growth is anemic at 2.2% YoY with flat net income growth and diluted EPS declining 21.4%, indicating challenges in product pipeline execution or market competition that offset operational efficiency.

ChatGPT

Biogen shows solid fundamental stability with strong free cash flow generation, healthy liquidity, and manageable leverage, which supports financial resilience. However, growth quality looks mixed: revenue growth is modest, net income is flat, diluted EPS declined sharply, and the reported gross margin above 100% suggests either unusual accounting dynamics or data-quality distortion that reduces clarity around underlying profitability.

Why Buy Biogen Inc.. Stock? BIIB Key Strengths

Claude
  • + Strong free cash flow generation at $2.1B with 20.7% FCF margin provides capital flexibility
  • + Solid liquidity position with 2.68x current ratio and 2.03x quick ratio supporting operational stability
  • + Healthy interest coverage of 5.8x and conservative 0.34x debt-to-equity ratio indicate low financial distress risk
  • + Consistent gross margin at 117.7% suggests pricing power and cost management despite sector pressures
ChatGPT
  • + Strong free cash flow generation with a 20.7% FCF margin and low capital intensity
  • + Healthy balance sheet with 2.68x current ratio, 2.03x quick ratio, and moderate 0.34x debt-to-equity
  • + Positive top-line growth and continued profitability with $1.29B net income and $2.20B operating cash flow

BIIB Stock Risks: Biogen Inc.. Investment Risks

Claude
  • ! Stagnant revenue growth at 2.2% YoY with zero net income growth signals potential product portfolio challenges or market saturation
  • ! Significant EPS decline of 21.4% year-over-year despite flat net income suggests share dilution or unfavorable capital allocation
  • ! Low ROE of 7.1% and ROA of 4.4% indicate modest returns on capital despite substantial asset base of $29.4B
  • ! Elevated gross margin at 117.7% appears anomalous and may indicate accounting irregularities or non-operating gains requiring clarification
ChatGPT
  • ! Growth is modest, with revenue up only 2.2% year over year and net income essentially flat
  • ! Diluted EPS fell 21.4% year over year, signaling weaker per-share earnings quality
  • ! Reported gross margin of 117.7% is anomalous and raises concern about metric reliability or nonrecurring accounting effects

Key Metrics to Watch

Claude
  • * Revenue growth trajectory and new product pipeline contribution rates
  • * Operating margin sustainability and R&D spending efficiency
  • * Free cash flow consistency and capital allocation strategy
  • * Return on equity improvement and share dilution trends
ChatGPT
  • * Operating margin and net income conversion from revenue growth
  • * Diluted EPS trend relative to net income and free cash flow

Biogen Inc.. (BIIB) Financial Metrics & Key Ratios

Revenue
$9.9B
Net Income
$1.3B
EPS (Diluted)
$8.79
Free Cash Flow
$2.1B
Total Assets
$29.4B
Cash Position
$3.0B

💡 AI Analyst Insight

The 20.7% free cash flow margin provides substantial flexibility for dividends, buybacks, and strategic investments. Strong liquidity with a 2.68x current ratio provides a solid financial cushion.

BIIB Profit Margin, ROE & Profitability Analysis

Gross Margin 117.7%
Operating Margin 15.7%
Net Margin 13.1%
ROE 7.1%
ROA 4.4%
FCF Margin 20.7%

BIIB vs Healthcare Sector: How Biogen Inc.. Compares

How Biogen Inc.. compares to Healthcare sector averages

Net Margin
BIIB 13.1%
vs
Sector Avg 12.0%
BIIB Sector
ROE
BIIB 7.1%
vs
Sector Avg 15.0%
BIIB Sector
Current Ratio
BIIB 2.7x
vs
Sector Avg 2.0x
BIIB Sector
Debt/Equity
BIIB 0.3x
vs
Sector Avg 0.6x
BIIB Sector

Sector benchmarks are approximate industry averages. Actual sector performance may vary.

Is Biogen Inc.. Stock Overvalued? BIIB Valuation Analysis 2026

Based on fundamental analysis, Biogen Inc.. has mixed fundamental signals relative to the Healthcare sector in 2026.

Return on Equity
7.1%
Sector avg: 15%
Net Profit Margin
13.1%
Sector avg: 12%
Revenue Growth
N/A
Year-over-year
Debt/Equity
0.34x
Sector avg: 0.6x

Note: This is a fundamental analysis based on SEC filings. For P/E ratio, price targets, and market-based valuation, consult financial data providers. This is not investment advice.

Biogen Inc.. Balance Sheet: BIIB Debt, Cash & Liquidity

Current Ratio
2.68x
Quick Ratio
2.03x
Debt/Equity
0.34x
Debt/Assets
38.0%
Interest Coverage
5.82x
Long-term Debt
$6.3B

BIIB Revenue & Earnings Growth: 5-Year Financial Trend

BIIB 5-year financial data: Year 2021: Revenue $14.4B, Net Income $5.9B, EPS $31.42. Year 2022: Revenue $13.4B, Net Income $4.0B, EPS $24.80. Year 2023: Revenue $11.0B, Net Income $1.6B, EPS $10.40. Year 2024: Revenue $10.2B, Net Income $3.0B, EPS $20.87. Year 2025: Revenue $9.9B, Net Income $1.2B, EPS $7.97.
Revenue
Net Income
EPS (right axis)

5-Year Trend Summary: Biogen Inc..'s revenue has declined by 31% over the 5-year period, indicating business contraction. The most recent EPS of $7.97 reflects profitable operations.

BIIB Revenue Growth, EPS Growth & YoY Performance

Revenue Growth
N/A
Year-over-year
Net Income Growth
N/A
Year-over-year
EPS Growth
N/A
Earnings per share
FCF Margin
20.7%
Free cash flow / Revenue

BIIB Quarterly Earnings & Performance

Quarterly financial performance data for Biogen Inc.. including revenue, net income, and earnings per share.
Quarter Revenue Net Income EPS
Q3 2025 $2.5B $388.5M $2.66
Q2 2025 $2.5B $583.6M $4.00
Q1 2025 $2.3B $240.5M $1.64
Q3 2024 $2.5B -$68.1M $-0.47
Q2 2024 $2.5B $583.6M $4.00
Q1 2024 $2.3B $387.9M $2.67
Q3 2023 $2.5B -$68.1M $-0.47
Q2 2023 $2.5B $591.6M $4.07

Data sourced from SEC EDGAR 10-Q quarterly filings. Figures may represent quarterly or cumulative values.

Biogen Inc.. Dividends, Buybacks & Capital Allocation

Operating Cash Flow
$2.2B
Cash generated from operations
Capital Expenditures
$153.8M
Investment in assets
Dividends
None
No dividend program

BIIB SEC Filings: Latest 10-K & 10-Q Analysis

Access official SEC EDGAR filings for Biogen Inc.. (CIK: 0000875045)

📋 Recent SEC Filings

Date Form Document Action
Apr 6, 2026 8-K biib-20260406.htm View →
Apr 3, 2026 4 xslF345X06/form4.xml View →
Mar 31, 2026 8-K d14986d8k.htm View →
Mar 11, 2026 8-K form8-k.htm View →
Feb 17, 2026 4 xslF345X05/form4.xml View →

Frequently Asked Questions about BIIB

What is the AI rating for BIIB?

Biogen Inc.. (BIIB) has a Combined AI Rating of HOLD from Claude (HOLD) and ChatGPT (HOLD) with 68% combined confidence, based on fundamental analysis of SEC EDGAR filings.

What are BIIB's key strengths?

Claude: Strong free cash flow generation at $2.1B with 20.7% FCF margin provides capital flexibility. Solid liquidity position with 2.68x current ratio and 2.03x quick ratio supporting operational stability. ChatGPT: Strong free cash flow generation with a 20.7% FCF margin and low capital intensity. Healthy balance sheet with 2.68x current ratio, 2.03x quick ratio, and moderate 0.34x debt-to-equity.

What are the risks of investing in BIIB?

Claude: Stagnant revenue growth at 2.2% YoY with zero net income growth signals potential product portfolio challenges or market saturation. Significant EPS decline of 21.4% year-over-year despite flat net income suggests share dilution or unfavorable capital allocation. ChatGPT: Growth is modest, with revenue up only 2.2% year over year and net income essentially flat. Diluted EPS fell 21.4% year over year, signaling weaker per-share earnings quality.

What is BIIB's revenue and growth?

Biogen Inc.. reported revenue of $9.9B.

Does BIIB pay dividends?

Biogen Inc.. does not currently pay dividends.

Where can I find BIIB SEC filings?

Official SEC filings for Biogen Inc.. (CIK: 0000875045) including 10-K, 10-Q, and 8-K reports are available on SEC EDGAR.

What is BIIB's EPS?

Biogen Inc.. has a diluted EPS of $8.79.

How is the AI analysis conducted?

Two independent AI systems — Claude (Anthropic) and ChatGPT (OpenAI) — analyze SEC EDGAR filings including 10-K annual reports and 10-Q quarterly reports. Each AI evaluates financial health, profitability ratios, balance sheet strength, and growth metrics. The combined rating reflects both perspectives for balanced insights.

Is BIIB a good stock to buy right now?

Based on our AI fundamental analysis in April 2026, Biogen Inc.. has a HOLD rating with 68% confidence. Review the strengths and risks sections above before making a decision. This is not investment advice.

Is BIIB stock overvalued or undervalued?

Valuation metrics for BIIB: ROE of 7.1% (sector avg: 15%), net margin of 13.1% (sector avg: 12%). Compare these metrics with sector averages to assess valuation.

Should I buy BIIB stock in 2026?

Our dual AI analysis gives Biogen Inc.. a combined HOLD rating for 2026. Revenue is data pending, with profitability above sector average. Always conduct your own research.

What is BIIB's free cash flow?

Biogen Inc..'s operating cash flow is $2.2B, with capital expenditures of $153.8M. FCF margin is 20.7%.

How does BIIB compare to other Healthcare stocks?

Vs Healthcare sector averages: Net margin 13.1% (avg: 12%), ROE 7.1% (avg: 15%), current ratio 2.68 (avg: 2).

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Disclaimer: This analysis is generated by Claude AI (Anthropic) and ChatGPT (OpenAI) based on publicly available SEC EDGAR filings. It does not include stock price data and should not be considered financial advice. All fundamental data is sourced from SEC public domain filings. Always conduct your own research and consult with a qualified financial advisor before making investment decisions.
Data Source: SEC EDGAR | Analysis Date: Mar 21, 2026 | Data as of: 2025-12-31 | Powered by Claude AI