KNSL — Kinsale Capital Group

Kinsale Capital Group operates the most cost-efficient underwriting platform in the U.S. excess and surplus lines market, running a combined ratio of 75.9% on $2 billion in gross written premium — roughly twenty-four points better than the industry average — through a proprietary technology system that encodes risk selection judgment into software rather than headcount. The expense advantage is structural: Kinsale's ~22% expense ratio has not moved as the company grew from $300 million to $2 billion in premium over five years, which is the evidence that the advantage is architectural rather than scale-dependent. At roughly 13 times normalized pre-tax earnings, the stock is priced as a midcycle insurer in a softening market; the business is something considerably better.

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The excess and surplus lines insurance market has been in a multi-year hard cycle, and 2025 is the year that cycle began separating companies that earned their profits from companies that were simply carried by price increases. From 2021 through 2024, U.S. E&S premium volume expanded at double-digit annual rates as standard carriers retreated from property, wildfire, flood, and complex liability risks, pushing commercial buyers into the non-admitted market where carriers can set their own terms freely. New capacity flooded in: London market managing general agents, fronting companies with minimal underwriting infrastructure, and standard carriers re-entering markets they had exited. By the end of 2025, E&S premium growth had decelerated to roughly 10% from the 13–20% rates of 2022 and 2023, and the commercial property segment — where pricing had been most aggressive — reversed sharply. Kinsale's gross written premium in its commercial property division fell 28% in Q4 2025 and 18% for the full year as the company deliberately pulled back from risks it no longer found adequately priced. The stock sold off in sympathy with the headline growth number. The underlying business did not change.

Excess and surplus lines insurance is the segment of the U.S. property-casualty market that operates outside the admitted framework. Standard insurance is regulated: carriers file rates with state departments of insurance, submit standardized policy forms, and operate under pricing constraints designed to prevent discrimination. This system works efficiently for well-characterized risks — residential homeowners, standard commercial auto, plain-vanilla general liability — and fails for everything else. A technology company needing errors and omissions coverage for novel AI products, a restaurant with a liquor liability history, a contractor working on a wildfire-exposure hillside site: these risks don't fit the standard underwriting box, so they flow into E&S, where carriers can price freely, modify terms, and decline business they don't want. The E&S market in the United States is approximately $100 billion in annual premium, having expanded from roughly $70 billion in 2020 as liability litigation, climate change, and emerging risk categories pushed more commercial buyers out of the standard market. That structural expansion is not reversing — the class of risks being pushed out of standard markets has grown, not shrunk.

Kinsale Capital Group was founded in Richmond, Virginia in 2009 by Michael P. Kehoe, who had spent the prior decade building E&S operations at James River Group. Rather than replicating the Lloyd's-influenced model of the established E&S market — specialist underwriters operating relatively manually, each carrying deep expertise in a narrow class of business — Kehoe built a technology-first platform that industrializes underwriting decisions. The system, called Transit, processes broker submissions digitally, integrates the risk selection criteria Kinsale's underwriters have developed over fifteen years, and turns around decisions faster and at lower cost per policy than any comparable operation. Transit was not assembled from third-party software or licensed from a vendor; it was written by Kinsale's own engineers encoding the company's own underwriting judgment. Modifying it requires deep institutional knowledge of both the technology and the business — which is why competitors building new E&S capacity in 2024 and 2025 have been doing so with humans, not with a comparable platform, and why the expense gap has not closed.

The expense ratio is the single most important fact about Kinsale. At approximately 22% for FY2025, Kinsale's expense ratio sits eight to ten percentage points below the industry average for E&S carriers, which runs in the 28–32% range. In an insurance business where underwriting margins are measured in single-digit percentages of premium, an eight-point structural cost advantage is an enormous competitive moat. The arithmetic makes the point directly: a carrier with a 22% expense ratio and a 50% loss ratio runs a 72% combined ratio and generates underwriting income equivalent to 28 cents per dollar of premium. A competitor with a 30% expense ratio must achieve a 42% loss ratio on identical business to match the same underwriting margin — and historically, the business that achieves 42% loss ratios does not exist in a competitive market because it would imply systematic underpricing of risk by every other market participant. The expense advantage means Kinsale can profit on risks that its competitors write at breakeven, which in turn means it can be more selective about what it writes, which in turn reinforces the loss ratio. The cycle compounds.

	Kinsale (KNSL)	RLI Corp (RLI)	E&S market average
Expense ratio	~22%	~28%	~30–32%
Combined ratio (FY2025)	75.9%	~83–88%	~95–100%
Operating ROE	26%	~15–18%	~10–12%

RLI Corporation is the most relevant peer for this comparison — a focused specialty underwriter with an excellent long-term record — and Kinsale's structural advantage over even RLI, which runs approximately 28% expenses, is material. The E&S market average includes a wide range of operators, from the large broking market participants whose expense ratios reflect Lloyd's overhead to fronting carriers whose economics look nothing like a traditional underwriter. Kinsale's 75.9% combined ratio for FY2025 is not a hard-market aberration; the company has consistently operated between 75% and 80% combined through multiple market environments, including periods of cat losses and the 2022–2023 property cycle. The consistency is evidence that the advantage is structural, not cyclical.

The full-year 2025 results confirm this. Gross written premium was $2.0 billion, up 5.7% from $1.89 billion in 2024 — a deceleration from the 25–40% growth rates of 2021–2024, explained entirely by the deliberate pullback in commercial property. Excluding the property division, GWP grew 13.3% in FY2025 and 10.2% in Q4 2025 — demonstrating that the core casualty, general liability, professional liability, and specialty lines businesses are compounding at rates well above the E&S market overall. Net income was $503.6 million for FY2025, up 21.4% year-over-year. Operating earnings per share was $19.51, up 21.5%. Underwriting income was $389.2 million, up from $325.9 million in 2024. The loss ratio was approximately 50.1% for the year. Book value per share increased 32.8% to $84.66, reflecting both underwriting income and investment portfolio returns. The company carries stockholders' equity of approximately $2 billion against a business generating $503 million in annual net income — return on equity of 26%.

The investment portfolio adds a second earnings stream that compounds with underwriting income. Kinsale holds a conservatively managed fixed-income portfolio — primarily high-quality corporate and government bonds — whose yield has been rising with interest rates and now generates meaningful net investment income. An E&S insurer with a 75.9% combined ratio is generating underwriting income before any investment return; the investment portfolio is incremental upside on capital that is never exposed to significant risk. This float-based business model is what makes the operating ROE of 26% possible — the company earns on both the underwriting margin and the float simultaneously.

Michael Kehoe founded the company and has run it continuously since 2009. His ownership stake is substantial and his compensation is structured around long-term book value per share growth rather than short-term earnings targets. In November 2025, the board authorized a new $250 million share repurchase program, and the company has consistently bought back stock since 2020 — not aggressively, because the return on retaining capital in the underwriting business is high, but opportunistically when the stock dips below fair value. Kinsale has not diluted shareholders through acquisitions, has not expanded into businesses outside its circle of competence, and has not stretched for premium volume at the cost of underwriting quality. The property pullback in 2025 is the most recent evidence of this discipline: when pricing deteriorated, Kehoe reduced the book rather than defend growth at the expense of margins. This is not what carriers under Wall Street pressure to show GWP growth typically do.

The growth runway is the penetration arithmetic. Kinsale's $2 billion in gross written premium represents approximately 2% of the U.S. E&S market, which is roughly $100 billion in annual premium and growing. Small to mid-market risks — the segment Kinsale focuses on, with average premium sizes well below large-account competitors — represent the broadest and most fragmented portion of the E&S market, largely served by generalist brokers who place business across multiple carriers without deep loyalty to any one underwriter. Kinsale's Transit platform makes it fast and easy for brokers to submit and receive decisions, which generates submission flow that competitors without comparable technology cannot match. The company has not attempted to expand into large-account risk, reinsurance, or London market business — its competitive advantage is specifically in the small to mid-market segment, and it is still in the early innings of capturing that opportunity.

Year	GWP ($M)	GWP Growth	Combined Ratio	Expense Ratio	Operating ROE	BV / Share
FY2021	~$843	—	~77%	~22%	~28%	~$40
FY2022	~$1,043	~+24%	~78%	~22%	~18%	~$45
FY2023	~$1,462	~+40%	~76%	~22%	~25%	~$55
FY2024	$1,892	+29%	76.4%	~22%	~24%	$63.75
FY2025	$2,004	+5.7%	75.9%	~22%	26%	$84.66

The table contains two signals worth examining carefully. The first is the expense ratio column: it has not moved. From FY2021 through FY2025, as Kinsale grew gross written premium from roughly $843 million to $2 billion, the expense ratio remained pinned at approximately 22%. This is not what happens with a human-capital-intensive underwriting operation — those businesses see expense ratios creep upward as they add headcount to manage growth, or downward only when they cut costs aggressively. A stable expense ratio at scale is direct evidence that the technology platform is doing the work. The second signal is the FY2025 GWP growth deceleration from 29% to 5.7% — which, paired with the 75.9% combined ratio (improved from 76.4% in 2024), confirms that Kehoe used the underwriting platform to select quality over volume. The 2025 deceleration is a feature, not a bug.

Kinsale has captured approximately 2% of U.S. E&S premium, a market that has been structurally expanding and shows no signs of reverting to pre-2020 levels. The company's ex-property casualty book grew 13.3% in FY2025 against a market growing at roughly 10% — demonstrating ongoing market share gains in the core segments. The commercial property division, currently shrinking due to pricing discipline, represents an optional future tailwind: when property pricing recovers to levels Kinsale finds adequate, the division can grow again. The company has not written off its property underwriting capability; it has simply reduced deployment when the risk-reward does not meet its standard. Property will return as a growth contributor when pricing justifies it.

At $326 per share, Kinsale trades at a market capitalization of approximately $7.55 billion. Operating earnings per share for FY2025 was $19.51; applying the approximate effective tax rate of 21% yields normalized pre-tax EPS of roughly $24.69. At $326, the price-to-normalized pre-tax earnings multiple is approximately 13.2 times — below the threshold at which the price would require earnings growth assumptions to justify ownership. The company's book value per share of $84.66 implies a price-to-book of approximately 3.85 times, which is the premium that a 26% operating ROE deserves. An insurer earning 26% on equity compounding indefinitely is worth a substantial multiple of book; 3.85 times is not heroic.

The most intelligent bear argument is that the E&S market will continue to soften — new capacity from London MGAs and fronting carriers will compress pricing, combined ratios for E&S writers as a class will normalize upward, and Kinsale's 75.9% combined ratio will prove to have been a hard-market artifact. The answer is that the expense ratio refutes this argument directly: Kinsale's combined ratio advantage over competitors is not primarily a loss ratio advantage — it is an expense ratio advantage of eight to ten percentage points that is structural and has been demonstrated across both soft and hard markets. Even if Kinsale's loss ratio were to normalize toward 60% in a soft market — giving back a decade of underwriting discipline — the 22% expense ratio would still produce a combined ratio well below 90%, which would still generate underwriting income that competitors at 30% expenses and 60% loss ratios would achieve only at breakeven.

For the thesis to weaken materially, one of two things must happen: either the expense ratio must rise — through Transit platform obsolescence, a shift to large-account risk requiring more manual underwriting, or competitive pressures forcing headcount additions — or the loss ratio must deteriorate significantly beyond what the hard-market cycle would explain. Neither is the current trajectory. Transit is Kinsale's internally built system, maintained by its own engineers; it does not become obsolete because a competitor builds a different system. The loss ratio has been consistent through 2021–2025 despite the property headwinds. At 13.2 times normalized pre-tax earnings on a business that has compounded book value at roughly 26–32% annually for a decade, the current price is offering a business with characteristics of a very good business at the price of an average one.

At 13 times normalized pre-tax earnings, the market is pricing Kinsale as a midcycle specialty insurer in a decelerating market. The 22% expense ratio — unchanged across five years and $1.1 billion of premium growth — is the evidence that the business is something else entirely.