Compare StocksACGL vs UNH

Arch Capital Group Ltd. (ACGL) vs UnitedHealth Group Incorporated (UNH)

ACGL
Arch Capital Group Ltd.
$93.82
VS
UNH
UnitedHealth Group Incorporated
$368.78

Rewards

ACGL
  • Arch Capital Group Ltd. scores 78/100 on the Economic Moat Score (Wide Moat), with reinvestment efficiency as the strongest competitive dimension.
  • Free cash flow has grown at a 17.6% CAGR over the past 4 years, demonstrating strong earnings power growth.
  • Each dollar of retained earnings has created $2.91 of earning power — management is an exceptional capital allocator.
UNH
  • Dividend yield of 2.40% with a consistent or growing payout over the past 4 years.

Risks

ACGL
  • Despite buyback spending, shares outstanding increased in 3 out of 4 years — stock-based compensation is offsetting repurchases.
  • Altman Z-Score of 1.10 places the company in the distress zone — financial patterns resemble those of companies that experienced bankruptcy.
  • Insiders have sold $7.2M worth of stock in the past 3 months — significant insider liquidation.
UNH
  • ROIC has declined by 7.9 percentage points over the observed period, which may signal competitive erosion.
  • Gross margin of 18.8% is low, suggesting a competitive or commodity-like market with limited pricing power.
  • FCF yield of 5.3% suggests reasonable valuation assuming continued moderate growth.

Key Valuation Metrics

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ACGL
UNH
Valuation
$6.26B
Free Cash Flow
$17.69B
18.89%
FCF Yield
5.28%
7.22
Trailing P/E
27.85
9.36
Forward P/E
17.77
Quality & Moat
14.67%
ROIC
15.60%
18.02%
ROE
11.45%
39.37%
Gross Margin
18.80%
0.08
PEG Ratio
39.79
Balance Sheet Safety
0.11
Debt / Equity
0.74
N/A
Interest Coverage
N/A
-0.15
Net Debt / EBITDA
2.18
N/A
Dividend Yield
2.40%
ACGL: 8Ties: 1UNH: 2
ACGLUNH

Historical Fundamentals

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ACGL

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

UNH

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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ACGL
$1.00
created per $1 retained over 3 years
Value Creator
Σ Retained
$11.16B
Δ Market Cap
+$11.18B
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
UNH
$-7.37
created per $1 retained over 3 years
Market Cap Declined
Σ Retained
$26.63B
Δ Market Cap
$-196.16B
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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ACGL
65.1% Margin of Safety
Price is 65.1% below estimated fair value
Current Price: $93.82
Fair Value: $268.67
Strongly undervalued
Undervalued
Fairly valued
Overvalued
Strongly overvalued
UNH
9.6% Overvalued
Price is 9.6% above estimated fair value
Current Price: $368.78
Fair Value: $336.33
Strongly undervalued
Undervalued
Fairly valued
Overvalued
Strongly overvalued

Reverse DCF — Market-Implied Growth

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ACGL

What growth rate is the market pricing in at $94?

-6.3%
Market-Implied Owner Earnings Growth
Standard FCF implies -11.7%

The market implies -6.3% Owner Earnings growth, below historical trends — potential opportunity.

Standard FCF implies a more demanding -11.7%, reflecting heavy growth investment expected to generate future returns.

UNH

What growth rate is the market pricing in at $369?

+13.9%
Market-Implied Owner Earnings Growth
Standard FCF implies +8.7%

The market implies +13.9% Owner Earnings growth, above historical trends.

Standard FCF implies a demanding +8.7%, reflecting heavy growth investment.

Economic Moat Score

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ACGL
78/100
Wide Moat
70+ Wide · 40-69 Narrow · <40 None

Wide moat driven primarily by reinvestment efficiency. Margin Stability is the area most vulnerable to competitive pressure.

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.
UNH
64/100
Narrow Moat
70+ Wide · 40-69 Narrow · <40 None

Narrow moat with revenue predictability as the key competitive advantage. Improving margin stability 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 4 years of fundamental data.

Forensic Accounting

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ACGL
-2.46
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.
UNH
-2.45
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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ACGL
Insiders 2.6%Institutions 95.4%Retail & Other 2.0%
No. of Institutional Holders1,309
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.
UNH
Insiders 0.8%Institutions 84.7%Retail & Other 14.5%
No. of Institutional Holders4,077
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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ACGL
0
Buys (3M)
0
Buys (12M)
No open market insider purchases found.
Open market purchases · includes direct & indirect ownership · excludes option exercises
UNH
0
Buys (3M)
5
Buys (12M)
Total value (12M): $31.61M
HEMSLEY STEPHEN J
Chief Executive Officer
$25.02M
@ $288.57 · 2025-05-16
REX JOHN F
President
$5.00M
@ $291.12 · 2025-05-16
GIL KRISTEN
Director
$1.00M
@ $271.17 · 2025-05-15
NOSEWORTHY JOHN H
Director
$93,647
@ $312.16 · 2025-05-14
FLYNN TIMOTHY PATRICK
Director
$491,786
@ $320.80 · 2025-05-14
FLYNN TIMOTHY PATRICK
Director
$511,575
@ $511.57 · 2025-01-17
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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ACGL
3
Sells (3M)
7
Sells (12M)
Total value (12M): $11.71M
PAPADOPOULO NICOLAS
Chief Executive Officer
$2.11M
@ $96.31 · 2026-03-10
GANSBERG DAVID E
President
$569,266
@ $96.37 · 2026-03-10
RAJEH MAAMOUN
Officer
$4.56M
@ $96.12 · 2026-02-11
MORIN FRANCOIS
Chief Financial Officer
$756,996
@ $94.62 · 2025-11-28
RAJEH MAAMOUN
President
$941,464
@ $94.15 · 2025-08-22
MORIN FRANCOIS
Chief Financial Officer
$1.19M
@ $94.58 · 2025-05-16
PETRILLO LOUIS T
Officer
$1.57M
@ $94.53 · 2025-05-09
PAPADOPOULO NICOLAS
Chief Executive Officer
$706,177
@ $92.48 · 2025-05-02
PETRILLO LOUIS T
Officer of Subsidiary Company
$1.93M
@ $91.78 · 2025-03-05
MORIN FRANCOIS
Chief Financial Officer
$1.17M
@ $102.46 · 2024-08-16
GANSBERG DAVID E
Officer
$966,444
@ $96.64 · 2024-05-06
Direct ownership only · excludes indirect, option exercises, planned (10b5-1) sales & derivatives
UNH
1
Sells (3M)
2
Sells (12M)
Total value (12M): $463,645
CONWAY PATRICK HUGH M.D.
Officer
$284,000
@ $355.00 · 2026-04-23
CONWAY PATRICK HUGH M.D.
Chief Executive Officer
$179,645
@ $305.00 · 2025-06-10
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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ACGL
FearGreed
😐Neutral(53/100)

"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.
UNH
FearGreed
😏Greed(65/100)

"Market is optimistic — be cautious and ensure you have a margin of safety"

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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ACGL
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 (53)
UNH
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: Greed (65)
View ACGL Full AnalysisView UNH Full Analysis
ACGL vs UNH: Which Is the Better Buy? | SafetyMargin.io