Quest Diagnostics Incorporated (DGX) vs Tesla, Inc. (TSLA): Which Is the Better Buy in 2026?
As of 2026-06-19, DGX is overvalued at $195, with a DCF intrinsic value of $154 and a margin of safety of -27%. TSLA is overvalued at $400, with an intrinsic value of $131 and a margin of safety of -206%. Of the two, DGX has the wider margin of safety.
Rewards
- ★4 insider purchases vs. 1 sell in the past 3 months — buying activity significantly outweighs selling.
- ★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
- ⚠Each dollar of retained earnings has produced only $0.36 of earning power — shareholders may have been better served by dividends.
- ⚠FCF yield of 6.3% suggests reasonable valuation assuming continued moderate growth.
- ⚠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 $195?
The market implies +11.6% Owner Earnings growth, above historical trends.
Standard FCF implies a demanding +7.9%, reflecting heavy growth investment.
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 margin stability as the key competitive advantage. Improving roic consistency 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: DGX vs TSLA
Is Quest Diagnostics Incorporated or Tesla, Inc. more undervalued in 2026?▼
Based on our discounted cash flow model, DGX trades at a -26.6% margin of safety (intrinsic value $154 vs. price $195), compared to TSLA's -206.1% margin of safety (intrinsic $131 vs. $400).
Which stock has a wider economic moat, Quest Diagnostics Incorporated or Tesla, Inc.?▼
DGX scores 56/100 (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, Quest Diagnostics Incorporated or Tesla, Inc.?▼
Quest Diagnostics Incorporated (DGX) generates a 6.3% 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, Quest Diagnostics Incorporated or Tesla, Inc.?▼
DGX earns 8.9% 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.