DexCom, Inc. (DXCM) vs Tesla, Inc. (TSLA): Which Is the Better Buy in 2026?
As of 2026-06-19, DXCM is undervalued at $72, with a DCF intrinsic value of $91 and a margin of safety of 21%. TSLA is overvalued at $400, with an intrinsic value of $131 and a margin of safety of -206%. Of the two, DXCM has the wider margin of safety.
Rewards
- ★Gross margin of 61.5% indicates strong pricing power — typical of businesses with significant intellectual property or brand strength.
- ★Free cash flow has grown at a 52.3% CAGR over the past 4 years, demonstrating strong earnings power growth.
- ★Each dollar of retained earnings has created $2.82 of earning power — management is an exceptional capital allocator.
- ★Altman Z-Score of 19.94 indicates very low bankruptcy risk — the company is firmly in the safe zone.
- ★Net debt/EBITDA of -2.6x means the company holds more cash than debt — a net cash position.
Risks
- ⚠5 insider sales totaling $2.9M with no purchases in the past 3 months — insiders are reducing their exposure.
- ⚠ROIC has declined by 21.5 percentage points over the past 4 years, which may signal competitive erosion.
- ⚠Gross margin of 19.1% is low, suggesting a competitive or commodity-like market with limited pricing power.
- ⚠Share count has increased by 19% over the past 4 years, diluting existing shareholders.
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 →What growth rate is the market pricing in at $72?
The market implies +14.2% Owner Earnings growth, below historical trends — potential opportunity.
Standard FCF implies a more demanding +11.0%, reflecting heavy growth investment expected to generate future returns.
What growth rate is the market pricing in at $400?
The market implies +50.2% Owner Earnings growth, above historical trends.
Standard FCF implies a demanding +45.1%, reflecting heavy growth investment.
Economic Moat Score
Learn more →Narrow moat with revenue predictability as the key competitive advantage. Improving margin stability would strengthen the moat.
No durable moat detected, though revenue predictability shows some competitive positioning. The business lacks consistent evidence of sustainable advantages.
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: DXCM vs TSLA
Is DexCom, Inc. or Tesla, Inc. more undervalued in 2026?▼
Based on our discounted cash flow model, DXCM trades at a 20.5% margin of safety (intrinsic value $91 vs. price $72), compared to TSLA's -206.1% margin of safety (intrinsic $131 vs. $400).
Which stock has a wider economic moat, DexCom, Inc. or Tesla, Inc.?▼
DXCM scores 65/100 (Narrow moat), while TSLA scores 31/100 (None moat). The moat score measures competitive advantage durability across ROIC consistency, margin stability, revenue predictability, and reinvestment efficiency.
Which company has better free cash flow, DexCom, Inc. or Tesla, Inc.?▼
DexCom, Inc. (DXCM) generates a 3.8% free cash flow yield, compared to Tesla, Inc.'s 0.3%. A higher FCF yield means the business converts more of its market value into cash that can be returned to shareholders or reinvested.
Which stock has higher return on invested capital, DexCom, Inc. or Tesla, Inc.?▼
DXCM earns 18.8% ROIC versus TSLA's 3.2%. A higher ROIC means the company generates more profit per dollar of capital employed, a hallmark of durable competitive advantage in Buffett-style analysis.