Kinsale Capital Group - Insuring what others won’t

How a Richmond insurer built a technology moat inside one of the least glamorous corners of American finance, and what the growth slowdown actually means

The business

Most insurance companies compete for the same pool of predictable risks: the office building with a clean loss history, the manufacturer with standard liability exposure, the homeowner in a low-flood zone. They compete on price, distribute through agents, and earn margins that reflect the commoditised nature of what they are selling.

Kinsale Capital does none of that.

The company operates exclusively in the Excess and Surplus lines market, a corner of the US insurance industry that handles what the standard market refuses. The restaurant with a prior fire claim. The cannabis dispensary. The construction firm working in a catastrophe zone. The life sciences startup with product liability exposure nobody has priced before. Risks that are unusual, complex or elevated get declined by admitted carriers and sent to the E&S market, where insurers operate without state-mandated rate and form filings. That regulatory freedom is the structural gift: E&S carriers can price risk as they see it, not as a regulator permits.

The E&S market in the United States was approximately $135 billion in premium volume in 2024, growing at 12.5% that year. It has grown faster than the admitted market for most of the past decade, driven by increasing risk complexity, climate exposure, and an expanding universe of novel business categories that standard underwriters decline to model. Kinsale’s share of that market is approximately 1.4%.

The company was founded in 2009 by Michael Kehoe, who had spent the prior fifteen years running E&S businesses at James River Insurance and Colony Insurance. It went public in 2016 at $16 per share. Revenue comes from underwriting income (the spread between premiums earned and losses plus expenses paid) and investment income earned on the float. In FY2025, investment income reached $192.2 million, up 27.9% from the prior year. It now represents approximately 38% of total net income.

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What makes this business tick: The moat

The E&S market is not inherently a high-return business. Scale alone does not create advantage: the largest E&S carriers do not post combined ratios anywhere near Kinsale’s. The moat here is specific, not structural to the market.

The Expense Ratio Advantage

The single most important number in Kinsale’s financial history is the expense ratio.

In FY2025, Kinsale’s expense ratio was 20.8%. The specialty insurance peer average sits in the mid-30s. That gap -- roughly 13-15 percentage points -- is permanent and compounding. On $1.6 billion of net written premiums in FY2025, it represents approximately $200 million of additional underwriting profit per year relative to a peer operating at average efficiency.

Chart 1: Kinsale expense ratio vs specialty insurance peers FY2025. Gap to average: approximately 14 percentage points.

The advantage comes from a proprietary technology platform that Kehoe built from the ground up, starting before the company had meaningful premium volume. Three specific mechanisms explain the expense ratio gap. First, underwriting speed and triage: routine small commercial submissions below a certain premium threshold are auto-processed, providing pricing outputs without requiring senior underwriter time. Each underwriter handles significantly more submissions per year than at a competitor relying on manual workflows. Second, loss data feedback loops: the data warehouse captures fifteen years of claim outcomes by risk type, geography and coverage line. This calibration enables Kinsale to identify which E&S segments are underpriced relative to actual loss experience -- and walk away -- or overpriced relative to peers -- and compete aggressively. A new E&S entrant has zero of this historical calibration. Third, claims integration: the same platform handles claims investigation and reporting alongside underwriting, eliminating the coordination overhead between departments that inflates costs at larger, siloed organisations.

This is not the kind of advantage a competitor can close by hiring a technology team. The data that trains Kinsale’s pricing models is fifteen years of proprietary E&S risk outcomes. The platform and the data are the same thing.

The Loss Ratio Discipline

Kinsale’s loss ratio in FY2025 was 55.1%, improved from 55.8% in FY2024. The company does not chase volume at the expense of underwriting quality. When the E&S market softens and competitors lower their standards to retain premium, Kinsale has historically been willing to let business walk. This is not a virtue in the abstract; it is a product of the fact that management’s incentives are aligned with long-term underwriting performance. Kehoe owns approximately 9.15% of the company.

The Float Machine

As the premium base has grown from $552 million in 2020 to $1.98 billion in FY2025, Kinsale’s investable float has grown proportionally. The float now stands at approximately $3.5 billion (unpaid losses and unearned premiums). Underwriting profitably, accumulating float, investing float at no cost of capital: this is the same flywheel that defines Berkshire Hathaway’s insurance operation.

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Five-Year Financial Performance

The five-year record is exceptional. FY2025 adds a new chapter: growth decelerated sharply, but the earnings quality held.

Gross written premiums

Chart 2: GWP FY2020-FY2025. Five-year CAGR approximately 29%. Teal bar = FY2025

It is worth being precise about what the slowdown does and does not mean. GWP growth measures how fast new premium is being written. Earnings quality is a separate question: it depends on the combined ratio, the expense leverage, and the investment income the float generates. In FY2025, GWP grew 5.7% and EPS grew 21.7%. Those two numbers in the same year are the most important data point in the article. The earnings machine does not depend on a hard market to function. A business whose EPS grew 21.7% in its slowest premium growth year is not a business that is weakening. It is a business whose earnings are becoming more diversified.

Combined ratio

Chart 3: Combined ratio trend FY2020-FY2025. White band shows approximate industry average. Breakeven = 100%.

A combined ratio below 100% means the underwriting operation is profitable before investment income. Below 90% is considered excellent in the industry. Kinsale has not exceeded 84% in any year on record.

Net Income and EPS

Chart 4: Net income (bars) and diluted EPS (gold line) FY2020-FY2025.

EPS grew 5.6x from 2020 to 2025, including +21.7% in FY2025 alone. ROE of 29.3% in FY2025 compares to a specialty insurance industry average of 15-20%.

Q4 2025 and Full-Year Summary

Q4 2025 was Kinsale’s strongest quarter of the year: combined ratio of 71.7%, net income +27.1%, EPS $5.99. The full-year FY2025 picture is one of growth deceleration (+5.7% GWP) offset by exceptional underwriting quality (combined ratio 75.9%) and a fast-compounding investment income stream ($192.2m). Q1 2026 results are due April 23, 2026.

The full-year 2025 soft market is now documented. The key forward question: does GWP growth recover toward management’s stated 10-20% cycle target in 2026? Analyst consensus for FY2026 projects approximately 13% GWP growth. April 23 is the first data point.

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Capital allocation

Kinsale carries $200 million of senior notes, a conservative debt load for a business with $2.0 billion in equity. The debt-to-equity ratio of approximately 0.11 is among the lowest in its peer group. The investment portfolio is conservatively positioned in fixed income, consistent with preserving the float while generating steady income.

Capital returns to shareholders accelerated in FY2025. Kinsale raised its quarterly dividend by 47% and authorised a new $250 million buyback programme after exhausting the previous $100 million facility.

The rationale is straightforward: at 29% ROE, every dollar retained and deployed into new premium business generates twenty-nine cents of annual return. Paying that dollar out as a dividend and having the shareholder reinvest it in a 5% bond is a destruction of economic value. The right answer is to compound internally for as long as the returns remain this high.

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Growth drivers

1. E&S market structural growth

The E&S market has grown faster than the admitted market for most of the past decade, and the structural drivers remain intact. Climate change is expanding the category of risks that admitted carriers decline. New business models (cannabis, rideshare, gig economy, AI liability) create novel risk exposures that standard insurers lack the data to price. Economic complexity and litigation frequency push more commercial risks into the non-standard category. The market growing at double-digit rates is not a cycle; it is a structural shift.

2. Market share within E&S

Kinsale’s 1.4% share of a $135 billion market leaves substantial room for growth at current size. The company’s competitive positioning within E&S is improving, not deteriorating: its expense advantage means it can profitably write business at rates that peers cannot match without losing money.

3. Investment income flywheel

The float grows with the premium base. Even if premium growth normalises to 15-20%, the float continues to expand, generating incremental investment income. At current interest rates, $3.0 billion of float generates approximately $150 million per year. If the premium base reaches $3 billion, the float-derived income stream becomes a material component of total earnings independent of underwriting results.

4. Property lines expansion

Property represents 29.3% of GWP in FY2025 (casualty 70.7%), having faced headwinds in the second half of 2025 as admitted carriers returned capacity. The E&S property market has been particularly hard-priced as admitted carriers pull back from catastrophe-exposed regions. Kinsale’s expansion into property is disciplined -- Kehoe has been explicit that the company will not sacrifice underwriting quality for growth -- but it represents a meaningful incremental driver for the next three to five years.

5. Casualty deepening

Kinsale’s 70.7% casualty concentration continues to compound on a growing base. Small business, allied health, life sciences, environmental and specialty casualty lines all represent verticals where Kinsale’s technology platform provides systematic pricing advantages.

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Risks

The risk profile of Kinsale is different from a typical growth company. The business generates cash, has conservative leverage, and has demonstrated underwriting discipline through multiple market cycles. The risks cluster in a specific way: the biggest threats are cyclical and competitive, not operational.