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

Same yardstick, side by side (as of September 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: MKL 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. MKL 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 MKL 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.

Markel Group Inc. is a Virginia-based holding company built on three engines: a specialty property and casualty insurance operation that underwrites hard-to-place and niche risks (from executive liability to equine coverage), an investment portfolio funded largely by insurance float, and Markel Ventures, a group of wholly owned operating businesses spanning industrial, consumer, and services companies. The insurance business generates premiums and, ideally, an underwriting profit, while the float is invested in equities and fixed income to compound over time. This design is why MKL is frequently described as a mini Berkshire Hathaway.

Full MKL 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.

• MKL drivers: Specialty underwriting discipline; Investment portfolio and float.
• 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: Reported earnings are volatile because unrealized investment gains and losses run through the income statement, so a down market can produce a headline net loss (as in Q1 2026) even with solid underwriting. 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 MKL 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 MKL and RLI guides.

MKL. MKL trades around a low-to-mid teens price-to-earnings multiple and near a modest premium to its roughly $1,447 book value per share, valuation anchors that matter more than headline EPS given the volatility of investment marks. Consensus 2026 EPS estimates were trimmed (from about $159 toward the low $140s) after a soft first quarter, and the reported Q1 2026 net loss reflected investment swings rather than a collapse in underwriting. Figures are approximate and move with markets and reserve updates.

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): MKL shows revenue (ttm) ~$15B, q1 2026 revenue ~$3.55B, market cap ~$23B, book value per share ~$1,447; RLI shows revenue (ttm) ~$1.8B, net premiums earned (2025) ~$1.61B, combined ratio (2025) ~83.6, market cap ~$5.7B.

MKL 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 MKL and RLI exposure against your real portfolio. It is not an investment adviser.