ABT 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: ABT 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. ABT 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 ABT 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.

Abbott Laboratories is a global healthcare company headquartered in North Chicago, Illinois, that discovers, develops, manufactures, and sells health care products in more than 160 countries through four segments: Medical Devices, Diagnostic Products, Nutritional Products, and Established Pharmaceutical Products. Medical Devices, the largest segment at roughly $21.4 billion in 2025 revenue, includes the FreeStyle Libre family of continuous glucose monitors, structural heart products (Navitor, TriClip), electrophysiology systems (AVEIR leadless pacemaker, Volt pulsed field ablation, TactiFlex Duo), vascular devices, and heart-failure technologies (CardioMEMS). Diagnostics contributed roughly $8.9 billion in 2025 before the Exact Sciences deal, Nutrition roughly $8.5 billion (anchored by Similac infant formula and Ensure adult nutrition), and Established Pharmaceuticals roughly $5.5 billion in branded generics sold primarily in emerging markets.

Full ABT 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.

• ABT drivers: FreeStyle Libre: A Platform, Not Just a Product; Cardiovascular and Electrophysiology Momentum.
• 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: The most acute near-term risk is infant formula litigation: juries have delivered verdicts including a $53 million compensatory award in late March 2026 and a separately upheld $495 million verdict, with hundreds of additional NEC-related cases pending, and a securities class action filed in 2026 adds a parallel legal exposure track targeting alleged investor misstatements. 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 ABT 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 ABT and TMO guides.

ABT. ABT's trailing GAAP P/E of about 34x is inflated by acquisition amortization and one-time costs from the Exact Sciences deal; on forward earnings the stock trades near 17x, well below its own 5-year and 10-year historical averages, after a roughly 16% decline in 2026. Revenue growth has remained positive, and the raised adjusted EPS guidance of $5.45-$5.60 implies a forward adjusted P/E of about 19x at the October 16 price of $104.44, below the average analyst target of about $121. Q3 2026 results are due October 21, with company guidance of $1.38-$1.46 adjusted EPS and consensus near $1.41 on about $13.0 billion of sales.

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): ABT shows revenue (ttm) ~$46.6 billion (Q2 2026 sales $12.59 billion, +13% reported, +4.8% comparable), revenue (fy 2025) ~$44.3 billion (+5.7% YoY), net income (ttm) ~$5.4 billion (GAAP EPS ~$3.10), net profit margin (ttm) ~11.7%; 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%.

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