American Express Company (AXP) vs TransDigm Group Incorporated (TDG): Which Is the Better Buy in 2026?
As of 2026-06-19, AXP is undervalued at $338, with a DCF intrinsic value of $484 and a margin of safety of 30%. TDG is overvalued at $1328, with an intrinsic value of $970 and a margin of safety of -37%. Of the two, AXP has the wider margin of safety.
Rewards
- ★Gross margin of 62.8% indicates strong pricing power — typical of businesses with significant intellectual property or brand strength.
- ★American Express Company scores 100/100 on the Economic Moat Score (Wide Moat), with revenue predictability as the strongest competitive dimension.
- ★Return on equity has consistently exceeded 20% over 4 years, indicating efficient use of shareholder capital.
- ★TransDigm Group Incorporated has maintained ROIC above 10% for 4 consecutive years, suggesting solid business economics.
- ★TransDigm Group Incorporated scores 94/100 on the Economic Moat Score (Wide Moat), with margin stability as the strongest competitive dimension.
- ★Free cash flow has grown at a 29.9% CAGR over the past 4 years, demonstrating strong earnings power growth.
Risks
- ⚠Altman Z-Score of 0.93 places the company in the distress zone — financial patterns resemble those of companies that experienced bankruptcy.
- ⚠17 insider sales with no purchases over the past 12 months — a persistent pattern of insider selling.
- ⚠Free cash flow has declined at a 5.9% CAGR over the past 4 years — a concerning trend.
- ⚠FCF yield of 2.1% is below 3%, meaning the market is pricing in substantial future growth to justify the current price.
- ⚠PEG ratio of 3.05 indicates the stock is expensive relative to its expected growth — the market may be pricing in more growth than analysts project.
- ⚠Net debt/EBITDA of 5.8x indicates heavy leverage — it would take over 4 years of EBITDA to pay off net debt.
Key Valuation Metrics
Learn more →Historical Fundamentals
Learn more →Price ÷ Earnings Per Share — how many years of current earnings you're paying for at today's price. Lower P/E may indicate undervaluation. The dashed forward point is the forward P/E — today's price ÷ analyst consensus EPS.
Price ÷ Earnings Per Share — how many years of current earnings you're paying for at today's price. Lower P/E may indicate undervaluation. The dashed forward point is the forward P/E — today's price ÷ analyst consensus EPS.
Price ÷ Earnings Per Share — how many years of current earnings you're paying for at today's price. Lower P/E may indicate undervaluation. The dashed forward point is the forward P/E — today's price ÷ analyst consensus EPS.
$1 Retained Earnings Test
Learn more →> $1 created per $1 retained = Value Creator · < $1 created = Value Destroyer
> $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
Learn more →Reverse DCF — Market-Implied Growth
Learn more →Requires positive FCF to compute implied growth rate.
What growth rate is the market pricing in at $1328?
The market implies +19.1% Owner Earnings growth, below historical trends — potential opportunity.
Standard FCF implies a more demanding +24.3%, reflecting heavy growth investment expected to generate future returns.
Economic Moat Score
Learn more →Wide moat driven primarily by revenue predictability. Margin Stability is the area most vulnerable to competitive pressure.
Wide moat with strength across all dimensions. Margin Stability is the standout factor.
Forensic Accounting
Learn more →M-Score Trend
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.
Ownership Breakdown
Learn more →High insider ownership aligns management incentives with shareholders. Institutional concentration can indicate smart-money conviction but also crowding risk.
Insider Buying Activity
Learn more →Open market purchases · includes direct & indirect ownership · excludes option exercises.
Insider Selling Activity
Learn more →Direct ownership only · excludes indirect, option exercises, planned (10b5-1) sales & derivatives.
🎭 Mr. Market's Mood
Learn more →"Market is pricing this stock without strong emotion in either direction"
"Market is pricing this stock without strong emotion in either direction"
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
Learn more →The Buffett Signal cross-references market sentiment with DCF valuation. Configure the DCF Analysis above to generate a signal.
The Buffett Signal cross-references market sentiment with DCF valuation. Configure the DCF Analysis above to generate a signal.
Frequently Asked Questions: AXP vs TDG
Is American Express Company or TransDigm Group Incorporated more undervalued in 2026?▼
Based on our discounted cash flow model, AXP trades at a 30.1% margin of safety (intrinsic value $484 vs. price $338), compared to TDG's -37.0% margin of safety (intrinsic $970 vs. $1328).
Which stock has a wider economic moat, American Express Company or TransDigm Group Incorporated?▼
AXP scores 100/100 (Wide moat), while TDG scores 94/100 (Wide moat). The moat score measures competitive advantage durability across ROIC consistency, margin stability, revenue predictability, and reinvestment efficiency.
Is American Express Company in financial distress?▼
AXP's Altman Z-Score of 0.9 places it in the Distress zone, signaling elevated bankruptcy risk. TDG scores 2.0 (Grey zone). The Altman Z-Score is a five-factor model that predicts insolvency within two years; scores below 1.81 indicate significant distress.
Which stock has higher return on invested capital, American Express Company or TransDigm Group Incorporated?▼
AXP earns 12.2% ROIC versus TDG's 10.9%. A higher ROIC means the company generates more profit per dollar of capital employed, a hallmark of durable competitive advantage in Buffett-style analysis.
Which dividend is safer, American Express Company's or TransDigm Group Incorporated's?▼
AXP's dividend earns a safety score of 94/100 (Very Safe), compared to TDG's 21/100 (Unsafe). AXP has raised its dividend for 3 consecutive years.