LUMN vs TDS: How Lumen Technologies and Telephone and Data Systems 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. LUMN and TDS 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 LUMN and TDS 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.

Lumen Technologies is a US communications company that owns one of the largest fiber-optic and long-haul networks in the country, serving enterprises, governments, and other carriers. For years it was viewed as a declining legacy telecom: revenue kept shrinking as customers left copper-based voice and older data services, and the company carried a heavy debt load that overshadowed the story. The recent narrative is a deliberate transformation into what management frames as the physical layer of artificial intelligence, connecting the data centers that train and run AI models.

Full LUMN guide

Telephone and Data Systems is a holding company that has spent the last two years dismantling and rebuilding itself. Its wireless business, UScellular, sold its operations and a large slice of spectrum to T-Mobile in a deal worth roughly $4.4 billion that closed in August 2025. What survived the sale is the infrastructure: about 4,400 cell towers, now housed in a separately listed entity called Array Digital Infrastructure, in which TDS holds roughly 81.9% of the equity and about 95.9% of the voting power. Alongside that sits TDS Telecom, the wireline segment, which passed one million marketable fiber service addresses and is building toward a target of about 2.1 million by 2028. Total revenue from continuing operations was roughly $309 million in the second quarter of 2026, with TDS Telecom contributing about $248 million of it.

Full TDS guide

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

• LUMN drivers: AI connectivity and Private Connectivity Fabric; Debt reduction and balance-sheet repair.
• TDS drivers: Fiber penetration, not fiber passings; The T-Mobile anchor lease at Array.

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 dominant risk is execution on a turnaround while legacy revenue is still shrinking: if new AI-driven strategic revenue does not ramp faster than older services decline, total revenue and cash flow can keep falling. For TDS, fiber is a capital-intensive business competing directly against cable incumbents and fixed wireless access from the same national carriers TDS now leases towers to, and overbuilt markets can see subscriber economics deteriorate quickly.

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 LUMN if you believe its drivers more; TDS 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 LUMN and TDS guides.

LUMN. Figures are approximate and tied to the asOf date; verify live numbers before acting. Because Lumen is mid-turnaround with heavy debt and one-time items moving reported earnings around, standard price-to-earnings ratios are not very meaningful here. Investors typically watch enterprise value versus adjusted EBITDA, free cash flow, the pace of the strategic-versus-legacy revenue shift, and the trajectory of net debt. The stock has been a high-beta, sentiment-driven name that has swung dramatically on AI-deal headlines.

TDS. Reported revenue understates the fiber growth rate because divested territories and declining copper lines sit in the same line item. The Q2 2026 earnings figure is not a clean run rate either, since post-transaction accounting and one-time items dominate it. Analysts generally value TDS on a sum of the parts: a fiber network valued per passing or per subscriber, plus a tower portfolio valued on contracted rent multiples, less debt and the Array minority interest.

Headline figures (approximate, Jul 2026): LUMN shows revenue (q1 2026) ~$2.9 billion, down from ~$3.2 billion a year earlier as legacy services and a divested consumer fiber unit shrank the top line, profitability Net loss in Q1 2026 (roughly $200 million), with reported results distorted by a large gain on the AT&T asset sale and a loss on early debt retirement, adjusted ebitda guidance Management has guided full-year adjusted EBITDA into a multi-billion-dollar range and expects it to inflect back toward growth, debt Long-term debt cut from ~$17.4 billion to ~$12.9 billion after the AT&T sale, still a heavy load with sizable 2029 to 2030 maturities; TDS shows market cap ~$4.1B, revenue (ttm, continuing ops) ~$1.2B, q2 2026 revenue ~$309M (vs ~$299M a year earlier), q2 2026 diluted eps (continuing ops) ~$2.24.

LUMN and TDS 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 LUMN and TDS exposure against your real portfolio. It is not an investment adviser.