MKL vs WTM: 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: 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 WTM 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 WTM 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

White Mountains Insurance Group is a holding company, not an insurer that happens to own a few other things. Its capital sits in four reported segments: Ark and the WM Outrigger sidecar, which underwrite specialty insurance and reinsurance largely at Lloyd's; Kudu Investment Management, which buys minority stakes in boutique asset and wealth managers and collects a share of their revenue; HG Global, the reinsurance arm behind municipal bond insurer BAM; and Distinguished, a specialty program manager placing more than ~$550 million of premium a year, majority-acquired in 2025 for ~$230 million. The business everybody still asks about, Bamboo, is mostly gone: White Mountains agreed in October 2025 to sell control of the California homeowners MGA to CVC funds at a ~$1.75 billion valuation, taking ~$840 million of net cash and keeping roughly 15%. Liam Caffrey became chief executive on January 1, 2026, after four years as chief financial officer.

Full WTM 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.
• WTM drivers: Redeploying the Bamboo proceeds; Ark and WM Outrigger in a softer market.

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 WTM, catastrophe is the clearest one.

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; WTM 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 WTM 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.

WTM. White Mountains retired its adjusted book value per share measure in 2025, so plain GAAP book value per share is now the headline figure and the one management is scored on. Price to book, not a price to earnings or price to sales multiple, is the relevant comparison, because reported revenue moves with whichever subsidiaries were consolidated that year. The repurchase price is a useful cross-check: the company paid about 93% of book value for its own stock in the second quarter of 2026.

Headline figures (approximate, JULY 2026): MKL shows revenue (ttm) ~$15B, q1 2026 revenue ~$3.55B, market cap ~$23B, book value per share ~$1,447; WTM shows book value per share (june 30, 2026) ~$2,258, price to book ~0.95x, book value per share growth ~4% in Q2 2026, ~3% for the first half including dividends, common shareholders' equity ~$5.39 billion.

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