IBM vs RGTI: How International Business Machines and Rigetti Computing Compare (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.

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. IBM and RGTI 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 IBM and RGTI 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.

International Business Machines (IBM) is one of the oldest and largest technology companies, now focused on enterprise software, consulting, and infrastructure. Its strategy centers on hybrid cloud and AI, anchored by Red Hat (the open-source software it acquired) and its watsonx AI platform. IBM's Software segment sells automation, data, security, and hybrid-cloud software, increasingly on a recurring subscription basis. Consulting provides large-scale technology and business services, helping enterprises modernize and adopt AI. Infrastructure includes IBM's mainframe systems (the zSystems that run mission-critical workloads for banks and large enterprises) and related storage. IBM makes money from a mix of recurring software, services contracts, and hardware tied to mainframe cycles. After years of slow growth, IBM has repositioned around hybrid cloud and AI, divested legacy businesses (spinning off Kyndryl), and emphasized recurring revenue and free cash flow. Founded in 1911 and headquartered in Armonk, New York, IBM is a mature, dividend-paying enterprise technology company.

Full IBM guide

Rigetti Computing (RGTI) is a quantum computing company that designs and builds superconducting quantum processors and the full-stack systems and software around them. It operates an integrated approach: it fabricates its own quantum chips in an in-house foundry, builds multi-qubit quantum processing units, and offers access to its machines through Quantum Cloud Services and partner cloud platforms. Rigetti's strategy centers on improving qubit count, gate fidelity, and system reliability over successive processor generations, working toward machines that can eventually deliver advantages over classical computers for specific problems. Customers and partners include government, research, and enterprise organizations exploring quantum algorithms. The company is still in an early, pre-commercial-scale phase: revenue is small and inconsistent, and it operates at a loss while investing in hardware research and fabrication. Founded in 2013 and headquartered in Berkeley, California, Rigetti went public via a SPAC merger in 2022 and remains a long-horizon, speculative bet on whether superconducting quantum computing reaches practical, fault-tolerant utility.

Full RGTI guide

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

• IBM drivers: Hybrid cloud with Red Hat; Enterprise AI with watsonx.
• RGTI drivers: Full-stack and in-house fabrication; Cloud access and partnerships.

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: IBM is a mature company that has struggled to grow revenue much above low single digits, so the story depends on the higher-growth software and AI mix offsetting slower legacy areas. For RGTI, rigetti is early-stage with small, inconsistent revenue and persistent operating losses, so it depends on its cash and periodic capital raises that can dilute shareholders heavily.

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 IBM if you believe its drivers more; RGTI 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 IBM and RGTI guides.

IBM. IBM trades at a valuation that reflects a mature enterprise technology company with modest revenue growth but strong, dependable free cash flow and a high dividend. The market increasingly prices in the higher-growth software and AI mix and the hybrid-cloud strategy, which has lifted sentiment from IBM's lower-growth past. It remains valued more as a cash-flow and income story than a high-growth name.

RGTI. Rigetti cannot be valued on earnings; revenue is small and inconsistent and the company loses money. The market prices it on the option value of quantum computing reaching practical utility years out, so the stock is extremely volatile and moves on sector sentiment, milestone news, and capital raises. Figures are approximate and change frequently; verify current revenue, cash, burn rate, and share count, which dilution can move materially.

Headline figures (approximate, early 2026): IBM shows revenue (ttm) ~$63 billion, operating margin ~15%, net income (ttm) ~$7 billion, p/e (ttm) ~25x; RGTI shows revenue (ttm) ~tens of millions, small and lumpy (verify), profitability Unprofitable; ongoing operating losses, cash burn ~tens of millions per year (verify latest), cash position Bolstered by equity raises; varies (verify current).

IBM and RGTI 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 IBM and RGTI exposure against your real portfolio. It is not an investment adviser.