Compare StocksAAPL vs BIIB

Apple Inc. (AAPL) vs Biogen Inc. (BIIB)

AAPL
Apple Inc.
$248.96
VS
BIIB
Biogen Inc.
$183.41

Rewards

AAPL
  • Apple Inc. has maintained ROIC above 15% for 4 consecutive years, indicating a durable competitive advantage.
  • Apple Inc. scores 96/100 on the Economic Moat Score (Wide Moat), with roic consistency as the strongest competitive dimension.
  • Return on equity has consistently exceeded 20% over 4 years, indicating efficient use of shareholder capital.
BIIB
  • Gross margin of 78.9% indicates strong pricing power — typical of businesses with significant intellectual property or brand strength.
  • Free cash flow has grown at a 19.9% CAGR over the past 4 years, demonstrating strong earnings power growth.

Risks

AAPL
  • FCF yield of 2.9% is below 3%, meaning the market is pricing in substantial future growth to justify the current price.
  • 12 insider sales with no purchases over the past 12 months — a persistent pattern of insider selling.
BIIB
  • FCF yield of 7.4% suggests reasonable valuation assuming continued moderate growth.

Key Valuation Metrics

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AAPL
BIIB
Valuation
$106.31B
Free Cash Flow
$1.98B
2.91%
FCF Yield
7.36%
31.55
Trailing P/E
20.87
26.71
Forward P/E
11.30
Quality & Moat
68.12%
ROIC
6.16%
127.01%
ROE
7.08%
47.33%
Gross Margin
78.95%
1.72
PEG Ratio
N/A
Balance Sheet Safety
1.03
Debt / Equity
0.36
N/A
Interest Coverage
N/A
0.15
Net Debt / EBITDA
0.79
0.42%
Dividend Yield
N/A
AAPL: 4Ties: 1BIIB: 5
AAPLBIIB

Historical Fundamentals

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AAPL

Price ÷ Earnings Per Share — how many years of current earnings you're paying for at today's price. Lower P/E may indicate undervaluation.

BIIB

Price ÷ Earnings Per Share — how many years of current earnings you're paying for at today's price. Lower P/E may indicate undervaluation.

Price ÷ Earnings Per Share — how many years of current earnings you're paying for at today's price. Lower P/E may indicate undervaluation.

$1 Retained Earnings Test

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AAPL
$7.57
created per $1 retained over 3 years
Exceptional Value Creator
Σ Retained
$257.06B
Δ Market Cap
+$1.94T
Buffett's "$1 Test": For every $1 of earnings retained, has management created at least $1 of market value?
> $1 created per $1 retained = Value Creator · < $1 created = Value Destroyer
BIIB
$-3.44
created per $1 retained over 3 years
Market Cap Declined
Σ Retained
$4.09B
Δ Market Cap
$-14.04B
Buffett's "$1 Test": For every $1 of earnings retained, has management created at least $1 of market value?
> $1 created per $1 retained = Value Creator · < $1 created = Value Destroyer

Buffett's "$1 Test": For every $1 of earnings retained, has management created at least $1 of market value?
> $1 created per $1 retained = Value Creator · < $1 created = Value Destroyer

Discounted Cash Flow (DCF) Analysis

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AAPL
38.3% Overvalued
Price is 38.3% above estimated fair value
Current Price: $248.96
Fair Value: $179.99
Strongly undervalued
Undervalued
Fairly valued
Overvalued
Strongly overvalued
BIIB
44.2% Overvalued
Price is 44.2% above estimated fair value
Current Price: $183.41
Fair Value: $127.16
Strongly undervalued
Undervalued
Fairly valued
Overvalued
Strongly overvalued

Reverse DCF — Market-Implied Growth

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AAPL

What growth rate is the market pricing in at $249?

+14.5%
Market-Implied Owner Earnings Growth
Standard FCF implies +15.2%

The market implies +14.5% Owner Earnings growth, above historical trends.

Standard FCF implies a demanding +15.2%, reflecting heavy growth investment.

BIIB

What growth rate is the market pricing in at $183?

+9.6%
Market-Implied Owner Earnings Growth
Standard FCF implies +3.8%

The market implies +9.6% Owner Earnings growth, above historical trends.

Standard FCF implies a demanding +3.8%, reflecting heavy growth investment.

Economic Moat Score

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AAPL
96/100
Wide Moat
70+ Wide · 40-69 Narrow · <40 None

Wide moat with strength across all dimensions. ROIC Consistency is the standout factor.

Composite score measuring competitive advantage durability across four dimensions: returns above cost of capital, pricing power stability, revenue predictability, and capital efficiency. Based on 5 years of fundamental data.
BIIB
55/100
Narrow Moat
70+ Wide · 40-69 Narrow · <40 None

Narrow moat with margin stability as the key competitive advantage. Improving roic consistency would strengthen the moat.

Composite score measuring competitive advantage durability across four dimensions: returns above cost of capital, pricing power stability, revenue predictability, and capital efficiency. Based on 5 years of fundamental data.

Forensic Accounting

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AAPL
-2.29
Unlikely Manipulator
Above -1.78 = likely manipulator · -2.22 to -1.78 = grey zone

M-Score Trend

Beneish's 8-variable model estimates the probability of earnings manipulation. An M-Score above -1.78 signals elevated risk — companies in this range have historically been 3-5× more likely to be manipulating earnings. Scores between -2.22 and -1.78 fall in a grey zone warranting further investigation.
BIIB
-2.64
Unlikely Manipulator
Above -1.78 = likely manipulator · -2.22 to -1.78 = grey zone

M-Score Trend

Beneish's 8-variable model estimates the probability of earnings manipulation. An M-Score above -1.78 signals elevated risk — companies in this range have historically been 3-5× more likely to be manipulating earnings. Scores between -2.22 and -1.78 fall in a grey zone warranting further investigation.

Beneish's 8-variable model estimates the probability of earnings manipulation. An M-Score above -1.78 signals elevated risk — companies in this range have historically been 3-5× more likely to be manipulating earnings. Scores between -2.22 and -1.78 fall in a grey zone warranting further investigation.

Ownership Breakdown

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AAPL
Insiders 1.6%Institutions 65.3%Retail & Other 33.1%
No. of Institutional Holders7,544
High insider ownership aligns management incentives with shareholders — a key signal in Buffett-style analysis. Institutional concentration can indicate smart-money conviction but also crowding risk.
BIIB
Insiders 0.2%Institutions 98.1%Retail & Other 1.8%
No. of Institutional Holders1,431
High insider ownership aligns management incentives with shareholders — a key signal in Buffett-style analysis. Institutional concentration can indicate smart-money conviction but also crowding risk.

High insider ownership aligns management incentives with shareholders. Institutional concentration can indicate smart-money conviction but also crowding risk.

Insider Buying Activity

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AAPL
0
Buys (3M)
0
Buys (12M)
No open market insider purchases found.
Open market purchases · includes direct & indirect ownership · excludes option exercises
BIIB
1
Buys (3M)
2
Buys (12M)
Total value (12M): $152,144
MURPHY NICOLE
Officer
$585.00
@ $195.00 · 2026-02-12
DORSA CAROLINE D
Director
$151,559
@ $122.72 · 2025-05-02
Open market purchases · includes direct & indirect ownership · excludes option exercises

Open market purchases · includes direct & indirect ownership · excludes option exercises.

Insider Selling Activity

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AAPL
0
Sells (3M)
12
Sells (12M)
Total value (12M): $129.96M
KONDO CHRISTOPHER
Officer
$1.02M
@ $271.23 · 2025-11-07
PAREKH KEVAN
Chief Financial Officer
$1.04M
@ $247.39 · 2025-10-16
O'BRIEN DEIRDRE
Officer
$11.07M
@ $257.39 · 2025-10-02
COOK TIMOTHY D
Chief Executive Officer
$33.38M
@ $256.81 · 2025-10-02
ADAMS KATHERINE L
General Counsel
$12.10M
@ $256.79 · 2025-10-02
LEVINSON ARTHUR D
Director
$20.89M
@ $232.07 · 2025-08-28
O'BRIEN DEIRDRE
Officer
$7.77M
@ $223.20 · 2025-08-08
KONDO CHRISTOPHER
Officer
$933,955
@ $208.19 · 2025-05-12
PAREKH KEVAN
Chief Financial Officer
$941,420
@ $206.00 · 2025-04-23
WILLIAMS JEFFREY E
Chief Operating Officer
$7.95M
@ $224.01 · 2025-04-02
COOK TIMOTHY D
Chief Executive Officer
$24.18M
@ $223.65 · 2025-04-02
ADAMS KATHERINE L
General Counsel
$8.68M
@ $223.67 · 2025-04-02
LEVINSON ARTHUR D
Director
$343,147
@ $226.35 · 2025-02-03
LEVINSON ARTHUR D
Director
$45.46M
@ $227.32 · 2024-11-19
KONDO CHRISTOPHER
Officer
$945,233
@ $228.87 · 2024-11-18
MAESTRI LUCA
Chief Financial Officer
$13.43M
@ $226.52 · 2024-10-04
O'BRIEN DEIRDRE
Officer
$13.84M
@ $226.87 · 2024-10-02
WILLIAMS JEFFREY E
Chief Operating Officer
$13.55M
@ $226.86 · 2024-10-02
COOK TIMOTHY D
Chief Executive Officer
$50.28M
@ $224.46 · 2024-10-02
ADAMS KATHERINE L
General Counsel
$13.80M
@ $226.20 · 2024-10-02
KONDO CHRISTOPHER
Officer
$1.96M
@ $225.00 · 2024-08-15
KONDO CHRISTOPHER
Officer
$1.12M
@ $216.50 · 2024-08-09
ADAMS KATHERINE L
General Counsel
$20.64M
@ $206.44 · 2024-08-05
LEVINSON ARTHUR D
Director
$14.37M
@ $191.58 · 2024-05-30
KONDO CHRISTOPHER
Officer
$951,785
@ $190.40 · 2024-05-15
MAESTRI LUCA
Chief Financial Officer
$9.26M
@ $174.12 · 2024-04-11
O'BRIEN DEIRDRE
Officer
$9.24M
@ $168.91 · 2024-04-02
COOK TIMOTHY D
Chief Executive Officer
$33.26M
@ $169.33 · 2024-04-02
ADAMS KATHERINE L
General Counsel
$9.24M
@ $168.90 · 2024-04-02
Direct ownership only · excludes indirect, option exercises, planned (10b5-1) sales & derivatives
BIIB
2
Sells (3M)
5
Sells (12M)
Total value (12M): $1.52M
SINGHAL PRIYA
Officer
$531,548
@ $199.83 · 2026-02-09
SINGHAL PRIYA
Officer
$134,116
@ $179.30 · 2026-02-02
SINGHAL PRIYA
Officer
$69,045
@ $133.55 · 2025-09-02
IZZAR RACHID
Officer
$300,105
@ $135.00 · 2025-07-08
SINGHAL PRIYA
Officer
$480,508
@ $126.25 · 2025-05-19
SHERWIN STEPHEN A
Director
$1.31M
@ $150.02 · 2025-03-07
SINGHAL PRIYA
Officer
$17,293
@ $157.21 · 2024-12-09
SINGHAL PRIYA
Officer
$88,019
@ $204.22 · 2024-09-03
SINGHAL PRIYA
Officer
$19,817
@ $213.09 · 2024-04-02
Direct ownership only · excludes indirect, option exercises, planned (10b5-1) sales & derivatives

Direct ownership only · excludes indirect, option exercises, planned (10b5-1) sales & derivatives.

🎭 Mr. Market's Mood

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AAPL
FearGreed
😐Neutral(52/100)

"Market is pricing this stock without strong emotion in either direction"

Composite sentiment score based on 6 market signals. Inspired by Buffett's "Mr. Market" allegory — fear = potential opportunity, greed = potential risk. Must be used alongside fundamental analysis, not in isolation.
BIIB
FearGreed
😐Neutral(56/100)

"Market is pricing this stock without strong emotion in either direction"

Composite sentiment score based on 6 market signals. Inspired by Buffett's "Mr. Market" allegory — fear = potential opportunity, greed = potential risk. Must be used alongside fundamental analysis, not in isolation.

Composite sentiment score based on market signals. Inspired by Buffett’s "Mr. Market" allegory — fear = potential opportunity, greed = potential risk. Must be used alongside fundamental analysis, not in isolation.

⚖️ Buffett Signal

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AAPL
Awaiting DCF Data

The Buffett Signal cross-references market sentiment with DCF valuation. Configure the DCF Analysis above to generate a signal.

DCF Margin of Safety: N/AMr. Market's Mood: Neutral (52)
BIIB
Awaiting DCF Data

The Buffett Signal cross-references market sentiment with DCF valuation. Configure the DCF Analysis above to generate a signal.

DCF Margin of Safety: N/AMr. Market's Mood: Neutral (56)
View AAPL Full AnalysisView BIIB Full Analysis
Apple Inc. (AAPL) vs Biogen Inc. (BIIB) Stock Comparison | SafetyMargin.io