# Arch Capital Group (ACGL) Financial Model

Free Excel 3-statement financial model and company analysis for Arch Capital Group.

- Canonical: https://finamodel.com/companies/arch-capital-group
- Industry: Insurance
- Downloadable model: Yes
- Excel download: https://finamodel.com/company-models/ACGL.xlsx

## Model Purpose

This model projects underwriting profitability, investment returns, and book value growth to determine the equity valuation of Arch Capital Group (ACGL) using a Return on Equity (ROE) and Price-to-Book Value framework.

## Company Overview

Arch Capital Group Ltd. is a Bermuda-based global provider of specialty property and casualty insurance, reinsurance, and mortgage insurance. The company operates a highly diversified underwriting platform that dynamically shifts capital to the most attractive risk-adjusted return opportunities across market cycles.

Business segments include:
- Reinsurance (approximately 48% of Gross Premiums Written): Provides treaty and facultative reinsurance globally.
- Insurance (approximately 46% of Gross Premiums Written): Offers specialty lines across North America, Bermuda, Europe, and Australia.
- Mortgage (approximately 6% of Gross Premiums Written): Provides mortgage insurance and reinsurance, primarily in the US and Australia.

The business model is capital-intensive but highly cash-generative, relying on disciplined underwriting (targeting a combined ratio well below 100%) and generating net investment income from the float. Arch Capital holds a strong competitive position as a premier specialty insurer and reinsurer, competing with firms like Chubb, Everest Group, and RenaissanceRe. A recent major event was the August 2024 acquisition of the US MidCorp and Entertainment (MCE) insurance businesses from Allianz, which expanded its middle-market presence.

## Revenue Deep Dive



### Insurance Segment

- **Segment name**: Insurance
- **Revenue driver formula**: Gross Premiums Written (GPW) less Ceded Premiums = Net Premiums Written (NPW). NPW adjusted for change in Unearned Premiums = Net Premiums Earned (NPE).
- **Historical growth rate**: 10-15% CAGR (boosted recently by the MCE acquisition).
- **Key growth levers and headwinds**: Rate adequacy in casualty lines, expansion in middle-market commercial lines, and retention ratios. Headwinds include increased competition in property lines.
- **Pricing dynamics**: Highly cyclical, driven by industry capacity and recent loss trends (the "hard" vs "soft" market cycle).
- **Revenue recognition notes**: Premiums are earned pro-rata over the policy term.
- **Seasonality**: Q1 and Q3 often see higher renewal volumes in commercial lines.

### Reinsurance Segment

- **Segment name**: Reinsurance
- **Revenue driver formula**: GPW less Ceded Premiums = NPW. NPW adjusted for change in Unearned Premiums = NPE.
- **Historical growth rate**: 15-20% CAGR over the last 3 years due to a hard property catastrophe market.
- **Key growth levers and headwinds**: Catastrophe pricing, retrocession costs, and global insured values. Headwinds include milder hurricane seasons leading to pricing pressure.
- **Pricing dynamics**: Spot pricing negotiated during major renewal periods (1 January, 1 April, 1 June, 1 July).
- **Revenue recognition notes**: Earned over the treaty period; subject to reinstatement premiums if losses occur.
- **Seasonality**: Q3 is typically exposed to US hurricane season, impacting net profitability rather than top-line revenue.

### Mortgage Segment

- **Segment name**: Mortgage
- **Revenue driver formula**: Insurance In Force (IIF) x Average Premium Rate = GPW.
- **Historical growth rate**: Flat to slightly declining (negative 1% to positive 2% CAGR) as the US housing market normalises.
- **Key growth levers and headwinds**: US mortgage origination volume, interest rates, and persistency rates (how long policies remain in force).
- **Pricing dynamics**: Regulated and highly competitive, driven by the GSEs (Fannie Mae and Freddie Mac) and proprietary pricing engines.
- **Revenue recognition notes**: Monthly premiums recognised as earned in the month coverage is provided.
- **Seasonality**: Tied to the spring and summer homebuying seasons.

## Cost Structure



### Variable Costs / COGS

- For an insurer, the equivalent of COGS is "Losses and Loss Adjustment Expenses" (LAE).
- **Gross margin range**: Insurers use the "Loss Ratio" (Losses / NPE). Arch's consolidated loss ratio typically ranges from 50% to 55%.
- **Key input costs**: Claims inflation, social inflation (jury verdicts in casualty lines), and weather events.
- **How COGS scales**: Step-function based on catastrophe events, but generally scales linearly with earned premiums in normal years.

### Operating Expenses

- **Acquisition Expenses**: Commissions and brokerage fees paid to intermediaries. Typically 15-20% of NPE.
- **Other Operating Expenses**: SG&A, headcount, IT, and corporate overhead. Typically 10-15% of NPE.
- **Depreciation & Amortisation**: Minimal, mostly related to IT systems and amortisation of intangible assets from M&A.
- **Stock-Based Compensation**: Included in operating expenses, generally immaterial relative to total premiums.
- **Restructuring / one-time charges**: Rare, though integration costs occurred in late 2024 and 2025 following the Allianz MCE acquisition.

### Margin Profile

- **Combined Ratio**: The primary margin metric (Loss Ratio + Acquisition Ratio + Operating Expense Ratio). Arch consistently operates at a 79% to 82% combined ratio.
- **Margin trend**: Stable to slightly expanding due to strong underwriting discipline and favourable prior-year reserve development.
- **Segment-level margins**: Mortgage operates at a very low combined ratio (20-30%), Reinsurance at 80-85%, and Insurance at 88-92%.

## Balance Sheet Structure

- **Total assets**: Approximately $47 billion.
- **Key asset categories**: Total Investments (fixed maturities, short-term investments, equities) make up the vast majority of assets. Premiums Receivable and Reinsurance Recoverables are also material.
- **Goodwill & intangibles**: Modest, representing historical acquisitions (e.g., UGC in 2016, Allianz MCE in 2024).
- **Working capital profile**: Not applicable in the traditional corporate sense. Insurers collect premiums upfront and pay claims later, generating "float".
- **PP&E**: Immaterial.
- **Right-of-use assets**: Immaterial relative to the investment portfolio.

## Capital Expenditure & Investment

- **Capex as % of revenue**: Less than 1%.
- **Maintenance capex vs. growth capex**: Almost entirely IT infrastructure and software development.
- **Major capex programmes**: None material.
- **Capitalised software**: Modest amounts capitalised for internal pricing and risk models.
- **M&A pattern**: Opportunistic bolt-on and transformational acquirer. Arch buys when valuations are attractive or to enter new markets (e.g., the MCE acquisition).
- **Typical acquisition multiple paid**: Usually evaluated on a Price-to-Book or Price-to-Tangible Book basis (typically 1.0x to 1.5x depending on the target's ROE).

## Debt & Capital Structure

- **Total debt**: Approximately $2.7 billion.
- **Debt/Capital ratio**: Typically managed between 10% and 15%.
- **Credit rating**: A- to A+ range across major rating agencies for senior debt; operating subsidiaries are rated A+ to AA-.
- **Key debt instruments**: Senior notes and a revolving credit facility.
- **Maturity profile**: Well-laddered with average maturities exceeding 5 years.
- **Interest rate profile**: Primarily fixed-rate senior notes.
- **Covenants**: Standard debt-to-capital and net worth covenants.
- **Share repurchase programme**: Highly active. Arch repurchased $1.9 billion of common stock in 2025 (roughly 5-6% of market cap).
- **Dividend policy**: The company does not pay a regular cash dividend, preferring to return capital via share repurchases or reinvest in the business.

## Cash Flow Characteristics

- **Operating cash flow conversion**: Extremely strong. OCF was $6.2 billion in 2025, significantly exceeding net income due to premium growth and reserve building.
- **Free cash flow margin**: FCF is essentially equal to OCF since capex is negligible.
- **Major non-cash items**: Depreciation, amortisation of intangible assets, deferred income taxes, and unrealised gains/losses on investments.
- **Working capital cash flow impact**: Growth in unearned premiums and loss reserves acts as a massive source of cash.
- **Capex intensity**: Near zero.
- **Cash tax rate vs. GAAP effective tax rate**: The effective tax rate is approximately 14.9%, impacted by the recent enactment of the Bermuda corporate income tax.

## Sheet Structure

1. **Assumptions**: Hardcoded drivers for premium growth, loss ratios, expense ratios, investment yields, and share repurchases.
2. **Summary & Valuation**: Key outputs, ROE calculation, Book Value Per Share projection, and Price-to-Book valuation.
3. **Insurance Segment**: GPW, Ceded Premiums, NPW, NPE, Losses and LAE, Acquisition Expenses, Other Operating Expenses, Underwriting Income.
4. **Reinsurance Segment**: Same line items as the Insurance segment.
5. **Mortgage Segment**: Same line items as the Insurance segment.
6. **Consolidated Income Statement**: Aggregation of segment underwriting income, plus Net Investment Income, Net Realised Gains/Losses, Interest Expense, Corporate Expenses, and Taxes.
7. **Investment Portfolio**: Roll-forward of cash and invested assets, yield assumptions, and calculation of Net Investment Income.
8. **Balance Sheet**: Cash, Investments, Premiums Receivable, Reinsurance Recoverables, Deferred Acquisition Costs, Reserve for Losses and LAE, Unearned Premiums, Debt, and Shareholders' Equity.
9. **Cash Flow Statement**: Net Income, non-cash adjustments, changes in operating assets/liabilities (reserves, unearned premiums), capex, debt issuance/repayment, and share repurchases.
10. **Debt & Equity Schedule**: Debt roll-forward, interest expense calculation, share count roll-forward (factoring in buybacks), and Book Value Per Share calculation.

## Key Financial Relationships

1. `Insurance NPW = Insurance GPW x (1 - Insurance Cession Ratio)`
2. `Insurance NPE = Insurance NPW + Beginning Insurance Unearned Premiums - Ending Insurance Unearned Premiums`
3. `Segment Losses and LAE = Segment NPE x Segment Loss Ratio`
4. `Segment Acquisition Expenses = Segment NPE x Segment Acquisition Expense Ratio`
5. `Segment Underwriting Income = Segment NPE - Segment Losses and LAE - Segment Acquisition Expenses - Segment Operating Expenses`
6. `Consolidated Combined Ratio = (Total Losses and LAE + Total Acquisition Expenses + Total Operating Expenses) / Total NPE`
7. `Average Invested Assets = (Beginning Total Investments + Ending Total Investments) / 2`
8. `Net Investment Income = Average Invested Assets x Annualised Book Yield`
9. `Ending Reserve for Losses and LAE = Beginning Reserve + Total Losses and LAE Incurred - Claims Paid`
10. `Ending Shareholders' Equity = Beginning Equity + Net Income - Share Repurchases + Other Comprehensive Income`
11. `Ending Diluted Shares = Beginning Diluted Shares - (Share Repurchases / Average Share Price)`
12. `Book Value Per Share = Ending Shareholders' Equity / Ending Diluted Shares`
13. `Operating ROE = After-Tax Operating Income / Average Shareholders' Equity`

## Cross-Sheet Dependencies

- The **Assumptions** sheet feeds the three segment sheets (**Insurance**, **Reinsurance**, **Mortgage**) and the **Investment Portfolio**.
- The three segment sheets feed the **Consolidated Income Statement** (NPE, Losses, Expenses).
- The **Investment Portfolio** calculates Net Investment Income, which feeds the **Consolidated Income Statement**.
- The **Consolidated Income Statement** generates Net Income, which feeds the **Cash Flow Statement** and the Retained Earnings line on the **Balance Sheet**.
- The **Cash Flow Statement** determines the change in Cash and Investments, which feeds back into the **Investment Portfolio** and **Balance Sheet**.
- The **Debt & Equity Schedule** calculates share repurchases and ending share count, which feeds the **Summary & Valuation** sheet to calculate Book Value Per Share.
- A minor circularity exists between Cash Flow (which determines average invested assets), Net Investment Income, Net Income, and Cash Flow. This should be managed with a circuit breaker or by using beginning-of-period balances for yield calculations if strict non-circularity is required.

## Sign Convention

- **Revenues (GPW, NPW, NPE)**: Positive.
- **Expenses (Losses, Acquisition, Operating, Interest, Taxes)**: Positive in their specific build-up schedules, but subtracted in the Income Statement to calculate profit.
- **Assets**: Positive.
- **Liabilities and Equity**: Positive.
- **Cash Flow**: Inflows are positive, outflows (like share repurchases or claims paid) are negative.

## Things Most Likely to Go Wrong

- "Confusing GPW, NPW, and NPE: The model must calculate the flow from Gross to Net to Earned accurately, as expenses and losses are strictly matched against Earned premiums."
- "Applying the combined ratio to Gross Premiums instead of Net Premiums Earned will drastically overstate expenses and losses."
- "Failing to account for prior-year reserve development: Arch historically releases reserves (favourable development), which lowers the reported loss ratio. The model must separate current accident year losses from prior-year development."
- "Mismodelling the Mortgage segment: Unlike P&C, mortgage insurance is tied to macroeconomic housing factors and cure rates. Applying standard P&C catastrophe loss assumptions to this segment will yield incorrect results."
- "Ignoring the float: The balance sheet must capture the massive liabilities for Unearned Premiums and Loss Reserves, which fund the investment portfolio. If the balance sheet does not balance, the investment income will be wrong."
- "Double-counting investment income: Investment income sits below Underwriting Income. Including it in the combined ratio calculation is a critical error."
- "MCE Acquisition distortion: Year-over-year growth rates for the Insurance segment in 2024 and 2025 are inflated by the Allianz MCE acquisition. Forward projections must normalise to organic growth rates."
- "Bermuda Tax changes: Bermuda enacted a new corporate income tax effective recently, which created a massive deferred tax asset in 2023/2024 and changes the go-forward effective tax rate to approximately 15%."

## Validation Checks

- "Consolidated Combined Ratio must be between 75% and 85%; flag if it exceeds 90% as this contradicts Arch's historical underwriting discipline."
- "Mortgage Segment Combined Ratio should be between 20% and 35%; flag if it spikes without a modelled macroeconomic housing stress scenario."
- "Net Investment Income should equal approximately 3.5% to 4.5% of Average Invested Assets."
- "Balance sheet must balance: Total Assets = Total Liabilities + Shareholders' Equity in every period."
- "Operating Cash Flow should be significantly higher than Net Income (typically 1.5x to 2.0x) due to premium growth and reserve accumulation."
- "Debt-to-Capital ratio should remain below 20%."
- "Effective tax rate should be approximately 14.9% based on the new Bermuda tax regime."

## Key Assumptions (Default Values)

| Assumption | Default Value | Unit | Rationale |
|---|---|---|---|
| Insurance GPW Growth | 6.0 | % | Normalised organic growth post-MCE acquisition |
| Reinsurance GPW Growth | 4.0 | % | Moderating hard market pricing in property cat |
| Mortgage GPW Growth | 0.0 | % | Flat US housing origination volume |
| Insurance Cession Ratio | 25.0 | % | Historical average of premiums ceded to reinsurers |
| Reinsurance Cession Ratio | 31.0 | % | Historical average, reflects retrocession purchases |
| Mortgage Cession Ratio | 15.0 | % | Historical average |
| Insurance Loss Ratio | 60.0 | % | 3-year historical average |
| Reinsurance Loss Ratio | 52.0 | % | 3-year historical average |
| Mortgage Loss Ratio | -5.0 | % | Reflects highly favourable cure rates on prior defaults |
| Insurance Acquisition Ratio | 16.0 | % | Historical average |
| Reinsurance Acquisition Ratio | 22.0 | % | Historical average |
| Mortgage Acquisition Ratio | 5.0 | % | Historical average |
| Consolidated Operating Expense Ratio | 11.0 | % | Historical average |
| Investment Portfolio Book Yield | 4.2 | % | Current yield environment on fixed maturities |
| Effective Tax Rate | 14.9 | % | FY2025 actual effective tax rate |
| Annual Share Repurchases | 1,500 | $ Millions | Run-rate based on $1.9B in 2025 and strong capital generation |
| Target Price-to-Book Multiple | 1.8 | x | Historical trading range for mid-teens ROE |

## Data Sources & Benchmarks

- **Filings**: SEC EDGAR (Arch Capital Group Ltd. 10-K and 10-Q filings), Arch Investor Relations website for Financial Supplements.
- **Key Peers**: Chubb (CB), Everest Group (EG), RenaissanceRe (RNR), Enact Holdings (ACT), Radian Group (RDN).
- **Industry Data**: Guy Carpenter or Aon Benfield reinsurance renewal reports for pricing trends; Fannie Mae / Freddie Mac macroeconomic housing forecasts for the Mortgage segment.
- **Consensus Estimates**: FactSet or Bloomberg for forward EPS and Book Value estimates.

## Sources

- Arch Capital Group Ltd. Q4 2025 Earnings Release and Financial Supplement (February 2026)
- Arch Capital Group Ltd. 2025 Annual Report (Form 10-K)
- Arch Capital Group Ltd. Q4 2025 Investor Presentation (February 2026)
- SEC EDGAR Database (https://www.sec.gov/edgar/searchedgar/companysearch)
- Arch Investor Relations (https://ir.archgroup.com)

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## Frequently asked questions

### What does Arch Capital Group (ACGL) do?

Arch Capital Group Ltd. is a Bermuda-based global provider of specialty property and casualty insurance, reinsurance, and mortgage insurance. The company operates a highly diversified underwriting platform that dynamically shifts capital to the most attractive risk-adjusted return opportunities across market cycles.

### How does Arch Capital Group generate its revenue?

Arch Capital Group generates revenue primarily through disciplined underwriting, targeting a combined ratio well below 100%, and by earning net investment income from the 'float' generated by premiums. Its business segments, including Reinsurance, Insurance, and Mortgage, contribute to its gross premiums written.

### What are the key profitability targets for Arch Capital Group's underwriting operations?

Arch Capital Group focuses on disciplined underwriting, aiming for a combined ratio well below 100% across its operations. This approach is fundamental to its capital-intensive yet highly cash-generative business model.

### What valuation framework is used to assess Arch Capital Group's equity?

The equity valuation of Arch Capital Group (ACGL) is determined using a Return on Equity (ROE) and Price-to-Book Value framework. This model projects underwriting profitability, investment returns, and book value growth to support the valuation.

### What is Arch Capital Group's approach to capital expenditure and acquisitions?

Arch Capital Group's capital expenditure is immaterial, representing less than 1% of revenue, primarily for IT infrastructure and software. The company is an opportunistic acquirer, engaging in bolt-on and transformational acquisitions when valuations are attractive or to enter new markets, such as the recent MCE acquisition.

### What are Arch Capital Group's main business segments and their contributions?

Arch Capital Group operates three main business segments: Reinsurance, which accounts for approximately 48% of Gross Premiums Written; Insurance, contributing about 46%; and Mortgage insurance, making up roughly 6%. This diversified platform allows the company to allocate capital dynamically across different risk opportunities.

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