NEOG vs TMO: Which Is the Better Buy in 2026?

Same yardstick, side by side (as of October 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: TMO 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. NEOG and TMO 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 NEOG and TMO 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.

Neogen Corporation, based in Lansing, Michigan and incorporated in 1981, develops and markets diagnostic products and test kits that detect contamination in the food chain and support animal health. It operates in two segments: Food Safety (roughly 70% of sales after the 3M Food Safety acquisition), which tests for pathogens, spoilage organisms, toxins, and allergens, and Animal Safety, which sells veterinary instruments, diagnostics, disinfectants, rodent and insect control products, and life science reagents. The Food Safety segment is now the larger contributor and the strategic core following the transformative 3M deal.

Full NEOG guide

Thermo Fisher Scientific, headquartered in Waltham, Massachusetts, is a global provider of scientific instruments, consumables, reagents, and services used across pharmaceutical and biotech drug development, clinical diagnostics, academic research, and environmental and industrial testing. The company operates through four reportable segments: Life Sciences Solutions (reagents, proteins, and consumables for research and bioproduction), Analytical Instruments (mass spectrometers, chromatography systems, electron microscopes, and laboratory equipment), Specialty Diagnostics (clinical diagnostic kits and transplant diagnostics), and Laboratory Products and Biopharma Services (supply-chain distribution, contract research through PPD, and contract drug manufacturing through Patheon). Revenue is generated through instrument sales, high-margin consumables and reagents that customers repurchase continuously, long-term service contracts, and growing contract development and manufacturing (CDMO) fees; consumables and services collectively account for a majority of annual sales and provide durable recurring revenue.

Full TMO guide

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

• NEOG drivers: Recurring food safety testing demand; Deleveraging and portfolio focus.
• TMO drivers: Bioprocessing and Biologic Drug Manufacturing Tailwind; Recurring Consumables and Reagents Engine.

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: Integration of the 3M Food Safety business has been Neogen's central challenge and remains unproven, with GAAP net losses (about $56 million over the trailing twelve months) reflecting heavy acquisition amortization and duplicate Petrifilm costs. For TMO, the most significant near-term risk is a contraction in research funding from government agencies (including NIH) and from biotech companies whose access to capital markets has historically been cyclical; when funding tightens, customers delay instrument purchases and reduce consumable orders, pressuring organic revenue growth.

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 NEOG if you believe its drivers more; TMO 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 NEOG and TMO guides.

NEOG. Neogen posts positive adjusted earnings but GAAP results still show net losses, largely from 3M acquisition amortization and integration costs. After a roughly 70% rally in 2026, the shares trade near 29 times forward EPS estimates and about 2.9 times sales, which already prices in a good part of the margin recovery management outlined at Investor Day. The gap between adjusted and reported figures, plus elevated debt, keeps the valuation contested; figures are approximate as of October 16, 2026.

TMO. Thermo Fisher's multiple has expanded sharply since mid-2026 as organic growth re-accelerated: the stock trades at roughly 25 times forward earnings and ~37 times trailing GAAP earnings, which include heavy acquisition amortization. Analysts expect 2026 adjusted EPS of ~$25.14 on ~$47.9 billion of revenue, and ~$27.58 on ~$50.4 billion in 2027, both roughly 10% growth. The October 21 third-quarter report will test whether the second quarter's 5% organic growth holds; free cash flow of roughly $6.3 billion in 2025 still gives the company flexibility for repurchases, dividends and acquisitions.

Headline figures (approximate, October 2026): NEOG shows revenue (ttm) ~$884M; latest quarter up ~6.5% year over year, q1 fy2027 revenue (aug 2026) ~$222.8M vs ~$208M consensus; adjusted EPS $0.08 vs $0.05, fy2027 revenue guidance ~$885-890M (raised $5M), net income (ttm) ~-$56M; trailing EPS ~-$0.26; TMO shows revenue (ttm) ~$46.3 billion; full year 2025 ~$44.6 billion, q2 2026 revenue ~$11.99 billion, up 10% reported and 5% organic, q2 2026 adjusted eps ~$6.03 (+13%) vs ~$5.71 expected, margins (ttm) Gross ~41%, GAAP operating ~19%, net ~15%.

NEOG and TMO 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 NEOG and TMO exposure against your real portfolio. It is not an investment adviser.