KNSL vs RLI: Which Is the Better Buy in 2026?

Same yardstick, side by side (as of August 2026). Valuation lined up like this is most meaningful for two names in the same corner of the market, which these are. Figures are approximate; verify before investing.

Reading it: KNSL is the cheaper of the two on forward earnings, but cheaper is not the same as better. Pair the valuation with growth (how far the forward P/E sits below the trailing P/E) and risk (beta) before you decide.

The metrics above tell you which is the marginally better business. The bigger risk for most people is not picking the slightly worse stock, it is over-concentrating. KNSL and RLI share themes, so owning both, or adding either to what you already hold, can quietly push a large share of your portfolio into one bet.

This is the part a generic comparison page cannot answer, because it depends on what you own. Connect your brokerage and Walnut shows your real, combined KNSL and RLI exposure, flags overlap with your existing positions, and tells you if adding one would tip you past a concentration you are comfortable with, read-only by default, with your login staying at your broker. Walnut is not an investment adviser.

Kinsale Capital Group is a specialty property and casualty insurer focused entirely on the U.S. excess and surplus (E&S) lines market, the segment that handles hard-to-place commercial risks the standard admitted market will not write. It underwrites a broad spread of commercial lines (property, excess casualty, small business, construction, allied health, professional liability, commercial auto, and environmental) plus a small personal-lines book, distributing exclusively through independent brokers across all 50 states. Its structural edge is a proprietary technology platform that lets it run an expense ratio near 20 percent, well below peers, which supports consistently profitable underwriting and returns on equity in the high-20s percent range.

Full KNSL guide

RLI Corp underwrites specialty property, casualty, and surety insurance in the United States, focusing on hard-to-place niche risks that standard carriers often avoid. It operates across the excess and surplus (E&S) and specialty admitted markets through three reportable segments: casualty (commercial excess, personal umbrella, general liability, transportation, and management liability), property (commercial fire, hurricane, earthquake, difference-in-conditions, and marine), and surety (specialty bonding). Its business is geographically broad within the US but not globally diversified, which gives it depth in domestic specialty lines while leaving it exposed to US legal, catastrophe, and economic conditions.

Full RLI guide

Both fit overlapping themes, but they are not interchangeable. The useful comparison is which set of drivers and risks you want exposure to.

• KNSL drivers: Structural low-cost advantage; E&S market tailwind.
• RLI drivers: Underwriting discipline and long profit streak; Rising net investment income.

A faster-growing, richer-valued name usually swings harder, so it suits a longer horizon and a higher tolerance for volatility; a steadier, more cash-generative business suits a more conservative or income-minded investor. The honest test is which set of risks you could hold through a drawdown: The largest single risk is valuation: a premium multiple leaves little room for disappointment, so any slowdown in growth or margin can compress the stock. For RLI, as a US-focused property and casualty insurer, RLI is exposed to catastrophe losses from hurricanes, earthquakes, and severe weather, which can cause quarter-to-quarter earnings swings.

Growth-minded investors who believe the theme has years to run tend to accept the richer multiple for more upside; value-minded investors lean toward the cheaper forward earnings and steadier profile. Pick KNSL if you believe its drivers more; RLI if you believe its. Many investors hold both, but since they share themes, that is a concentrated bet, not diversification. Decide deliberately and check overlap. For the full detail, see the KNSL and RLI guides.

KNSL. Kinsale trades at a premium to most specialty insurers, recently around the high-teens on trailing earnings and several times book value, which reflects its sector-leading return on equity and low combined ratio rather than a bargain price. Q1 2026 net income rose to about $112.6 million ($4.88 per diluted share) as the combined ratio improved year over year. Figures are approximate and drawn from company releases; they move with each quarterly report.

RLI. RLI traded near $61 per share in July 2026 for a market cap around $5.7 billion. Full-year 2025 comprehensive earnings were roughly $489 million (about $5.29 per share) on net premiums earned near $1.61 billion, and Q1 2026 net income was about $54.9 million ($0.83 per share). The shares typically command a premium price-to-book multiple versus other insurers, reflecting the company's long underwriting-profit record.

Headline figures (approximate, July 2026): KNSL shows revenue (ttm) ~$1.85B, gross written premiums (fy2025) ~$2.0B, net income (fy2025) ~$503.6M, combined ratio (q1 2026) ~77.4%; RLI shows revenue (ttm) ~$1.8B, net premiums earned (2025) ~$1.61B, combined ratio (2025) ~83.6, market cap ~$5.7B.

KNSL and RLI are related but distinct: same themes, different businesses and risks. Neither wins in the abstract; the right pick is whichever thesis you actually believe, sized so you are not over-concentrated in one theme. Walnut can show your combined KNSL and RLI exposure against your real portfolio. It is not an investment adviser.