Compare StocksAON vs MSFT

Aon plc (AON) vs Microsoft Corporation (MSFT)

AON
Aon plc
$316.99
VS
MSFT
Microsoft Corporation
$389.02

Rewards

AON
  • Aon plc has maintained ROIC above 10% for 4 consecutive years, suggesting solid business economics.
  • Aon plc scores 90/100 on the Economic Moat Score (Wide Moat), with reinvestment efficiency as the strongest competitive dimension.
  • Each dollar of retained earnings has created $1.94 of market value — management is creating shareholder value.
MSFT
  • Microsoft Corporation has maintained ROIC above 15% for 4 consecutive years, indicating a durable competitive advantage.
  • Gross margin of 68.6% indicates strong pricing power — typical of businesses with significant intellectual property or brand strength.
  • Microsoft Corporation scores 88/100 on the Economic Moat Score (Wide Moat), with revenue predictability as the strongest competitive dimension.

Risks

AON
  • Altman Z-Score of 1.80 places the company in the distress zone — financial patterns resemble those of companies that experienced bankruptcy.
MSFT
  • FCF yield of 2.5% is below 3%, meaning the market is pricing in substantial future growth to justify the current price.

Key Valuation Metrics

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AON
MSFT
Valuation
$3.06B
Free Cash Flow
$71.61B
4.49%
FCF Yield
2.48%
18.62
Trailing P/E
24.33
14.72
Forward P/E
20.64
Quality & Moat
16.61%
ROIC
22.10%
38.70%
ROE
26.05%
47.20%
Gross Margin
68.59%
0.13
PEG Ratio
0.41
Balance Sheet Safety
1.68
Debt / Equity
0.32
N/A
Interest Coverage
N/A
2.38
Net Debt / EBITDA
0.19
0.94%
Dividend Yield
0.94%
AON: 5Ties: 2MSFT: 5
AONMSFT

Historical Fundamentals

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AON

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

MSFT

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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AON
$1.94
created per $1 retained over 3 years
Value Creator
Σ Retained
$7.23B
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
MSFT
$9.18
created per $1 retained over 3 years
Exceptional Value Creator
Σ Retained
$196.68B
Δ Market Cap
+$1.81T
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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AON
26.3% Margin of Safety
Price is 26.3% below estimated fair value
Current Price: $316.99
Fair Value: $429.96
Strongly undervalued
Undervalued
Fairly valued
Overvalued
Strongly overvalued
MSFT
0.5% Overvalued
Price is 0.5% above estimated fair value
Current Price: $389.02
Fair Value: $387.10
Strongly undervalued
Undervalued
Fairly valued
Overvalued
Strongly overvalued

Reverse DCF — Market-Implied Growth

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AON

What growth rate is the market pricing in at $317?

+9.1%
Market-Implied Owner Earnings Growth
Standard FCF implies +11.6%

The market implies +9.1% Owner Earnings growth, below historical trends — potential opportunity.

Standard FCF implies a more demanding +11.6%, reflecting heavy growth investment expected to generate future returns.

MSFT

What growth rate is the market pricing in at $389?

+12.6%
Market-Implied Owner Earnings Growth
Standard FCF implies +17.4%

The market implies +12.6% Owner Earnings growth, roughly in line with history — reasonably priced.

Standard FCF implies +17.4%, reflecting ongoing growth investment.

Economic Moat Score

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AON
90/100
Wide Moat
70+ Wide · 40-69 Narrow · <40 None

Wide moat with strength across all dimensions. Reinvestment Efficiency 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 4 years of fundamental data.
MSFT
88/100
Wide Moat
70+ Wide · 40-69 Narrow · <40 None

Wide moat driven primarily by revenue predictability. Reinvestment Efficiency 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 4 years of fundamental data.

Forensic Accounting

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AON
-2.36
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.
MSFT
-2.51
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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AON
Insiders 2.8%Institutions 88.8%Retail & Other 8.4%
No. of Institutional Holders1,739
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.
MSFT
Insiders 0.1%Institutions 76.0%Retail & Other 23.9%
No. of Institutional Holders8,054
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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AON
1
Buys (3M)
1
Buys (12M)
Total value (12M): $1.28M
KNIGHT LESTER B III
Director
$1.28M
@ $319.24 · 2026-02-10
SPRUELL BYRON
Director
$246,558
@ $340.08 · 2024-08-28
KNIGHT LESTER B III
Director
$2.77M
@ $276.61 · 2024-05-03
Open market purchases · includes direct & indirect ownership · excludes option exercises
MSFT
1
Buys (3M)
2
Buys (12M)
Total value (12M): $3.44M
STANTON JOHN W.
Director
$1.99M
@ $397.35 · 2026-02-18
SMITH BRADFORD LEE
President
$1.45M
@ $377.47 · 2025-04-23
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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AON
2
Sells (3M)
3
Sells (12M)
Total value (12M): $6.09M
ZEIDEL DARREN
General Counsel
$1.42M
@ $329.72 · 2026-02-26
ZEIDEL DARREN
General Counsel
$1.64M
@ $325.79 · 2026-02-17
ZEIDEL DARREN
General Counsel
$3.03M
@ $344.52 · 2025-11-05
SIMON MINDY F
Chief Operating Officer
$256,321
@ $394.34 · 2024-11-27
STEVENS LISA
Officer
$494,295
@ $387.68 · 2024-11-26
ZEIDEL DARREN
General Counsel
$312,688
@ $329.15 · 2024-08-12
STEVENS LISA
Officer
$131,580
@ $328.95 · 2024-08-12
ZEIDEL DARREN
General Counsel
$2.05M
@ $310.00 · 2024-07-26
Direct ownership only · excludes indirect, option exercises, planned (10b5-1) sales & derivatives
MSFT
1
Sells (3M)
13
Sells (12M)
Total value (12M): $172.43M
HOGAN KATHLEEN T
Officer
$5.05M
@ $409.55 · 2026-03-06
NUMOTO TAKESHI
Officer
$1.36M
@ $478.72 · 2025-12-04
ALTHOFF JUDSON
Officer
$6.27M
@ $491.52 · 2025-12-02
SMITH BRADFORD LEE
President
$19.97M
@ $518.64 · 2025-11-03
NADELLA SATYA
Chief Executive Officer
$75.32M
@ $504.78 · 2025-09-03
NUMOTO TAKESHI
Officer
$2.56M
@ $527.32 · 2025-08-12
NUMOTO TAKESHI
Officer
$1.39M
@ $463.00 · 2025-06-03
NUMOTO TAKESHI
Officer
$460,008
@ $460.01 · 2025-05-30
HOGAN KATHLEEN T
Officer
$9.76M
@ $453.77 · 2025-05-21
ALTHOFF JUDSON
Officer
$7.33M
@ $458.18 · 2025-05-19
COLEMAN AMY
Officer
$5.99M
@ $452.04 · 2025-05-15
SMITH BRADFORD LEE
President
$1.68M
@ $438.44 · 2025-05-05
SMITH BRADFORD LEE
President
$35.30M
@ $435.84 · 2025-05-05
NUMOTO TAKESHI
Officer
$1.12M
@ $447.41 · 2024-12-09
NUMOTO TAKESHI
Officer
$874,634
@ $437.32 · 2024-12-04
NUMOTO TAKESHI
Officer
$1.50M
@ $428.76 · 2024-12-02
ALTHOFF JUDSON
Officer
$10.43M
@ $417.00 · 2024-11-22
NUMOTO TAKESHI
Officer
$414,720
@ $414.72 · 2024-11-22
YOUNG CHRISTOPHER DAVID
Officer
$3.05M
@ $423.66 · 2024-11-12
HOGAN KATHLEEN T
Officer
$7.16M
@ $411.86 · 2024-09-10
NUMOTO TAKESHI
Officer
$1.03M
@ $411.04 · 2024-09-10
SMITH BRADFORD LEE
President
$16.10M
@ $402.59 · 2024-09-09
HOOD AMY E
Chief Financial Officer
$15.60M
@ $410.55 · 2024-09-05
NADELLA SATYA
Chief Executive Officer
$32.02M
@ $408.63 · 2024-09-04
NUMOTO TAKESHI
Officer
$235,535
@ $416.14 · 2024-06-03
ALTHOFF JUDSON
Officer
$10.64M
@ $425.68 · 2024-05-23
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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AON
FearGreed
😨Fear(39/100)

"Market is pessimistic — investigate whether fears are temporary or structural"

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.
MSFT
FearGreed
😐Neutral(43/100)

"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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AON
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: Fear (39)
MSFT
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 (43)
View AON Full AnalysisView MSFT Full Analysis
Aon plc (AON) vs Microsoft Corporation (MSFT) Stock Comparison | SafetyMargin.io