Telephone and Data Systems, Inc. (NYSE: TDS) — Investment Analysis

Analyst: value-investing workflow. Date: 2026-06-06. Price: $39.16 (2026-06-05 close). Primary sources: TDS FY2025 10-K (filed 2026-02-24), FY2024/FY2023 10-Ks, Q1 2026 and Q4 2025 earnings calls, AlphaVantage financials, SEC EDGAR. No analyst reports used.

Executive summary

Three-sentence thesis. TDS is a family-controlled telecom holding company mid-transformation: it sold its UScellular wireless operations to T-Mobile (closed Aug 1, 2025), rebranded the remaining wireless/tower/spectrum entity "Array Digital Infrastructure" (NYSE: AD, 82.0%-owned), and is now a cleaner story of (a) an 82% stake in a publicly traded tower company that is shedding spectrum for cash and paying large special dividends, plus (b) TDS Telecom, a regional fiber builder doing $330M of EBITDA. At $39.16 the market values TDS's 82% Array stake at ~$3.64B against a $4.45B TDS market cap, implying the entire TDS Telecom fiber business plus net cash is priced at only ~$0.8B — a holdco discount that the just-announced TDS/Array all-stock merger and ongoing spectrum special dividends are designed to close. The signal is real (Howard Marks/Oaktree added +16% in Q1 2026 into exactly this catalyst), but after a +426% three-year run the stub is already partly recognized, so the margin of safety is moderate, not extreme — a WAIT with a defined accumulate level, not a table-pounding buy.

Metrics dashboard

1. What you are actually buying (structure first)

TDS is not an operating company you value on consolidated earnings. It is a holding company with three pieces:

1. 82.0% of Array Digital Infrastructure, Inc. (NYSE: AD) — a stand-alone tower company created from the carcass of UScellular after the wireless customer business was sold to T-Mobile. Array owns:
   • 4,450 towers in 19 states (mostly suburban/rural; ~1/3 have no competing tower within 2 miles; ~18% on owned/perpetual-easement land).
   • Wireless spectrum, principally C-band, of which ~70% is already under agreement to sell for cash (AT&T, Verizon, T-Mobile).
   • Noncontrolling interests in wireless partnerships managed by AT&T and Verizon — passive, cash-generative, carried at $462M book (worth materially more, but locked by a very low tax basis).
2. TDS Telecom — a wholly owned regional broadband business pivoting from copper/cable to fiber, targeting 2.1M marketable fiber service addresses (~1.1M today, 58% of footprint), $330M adjusted EBITDA, ~$406M FY2025 capex rising to $550-600M in 2026 as the fiber build accelerates.
3. Parent net cash and securities — after the Aug-2025 wireless sale, the Jan-2026 AT&T spectrum sale, repayment of TDS term-loan debt, and receipt of $725.6M of Array's Feb-2026 special dividend, TDS sits on a net-cash parent balance sheet for the first time in its history.

This structure is the whole investment case. The value lives in the parts; the question is the size of the conglomerate/holdco discount between TDS's price and the look-through value of those parts.

Citations: FY2025 10-K — "TDS... owns 82.0% of the equity of Array as of December 31, 2025"; "Array owns 4,450 towers in 19 states"; segment Adjusted EBITDA TDS Telecom $330.3M, Array $194.3M.

2. Phase 1 — Risk analysis (inversion: how do I lose money here?)

I invert: what has to happen for TDS to be a permanent loss of capital from $39?

Tail risk (non-additive). The combination that hurts most: the family declines the clean merger, AD de-rates, and fiber returns disappoint simultaneously — a scenario where you are left holding a perpetually discounted conglomerate of two mediocre-return businesses. That is the bear case and it is plausible; it is why this is not a 5% position.

Key mitigants. (a) Net-cash parent balance sheet removes financial-distress risk; (b) the Array merger proposal (announced Q1 2026) is evidence the family is actively collapsing the discount, not entrenching it; (c) towers and fiber are real, hard, inflation-linked assets with replacement value well above carrying value; (d) low beta (~0.30) and downside protection from net cash + the AD market price as a floor under most of the value.

3. Phase 2 — Financial analysis

3.1 Why consolidated GAAP ratios are misleading here

The processed financial summary shows ROE -0.1%, revenue "CAGR" -25% and erratic margins. These are artifacts of the transformation, not the business. The wireless business (the bulk of historical revenue) was sold and reclassified to discontinued operations; FY2025 consolidated continuing-operations revenue is $1.23B vs. ~$5B in prior years. Net income swings on one-time gains/losses from the sale, debt exchange, and Array special dividends. You cannot value TDS on a P/E or consolidated ROE. The correct lens is segment cash economics and sum-of-the-parts.

3.2 Segment economics (FY2025, from 10-K MD&A)

Note TDS Telecom is FCF-negative at the segment level by design — it is in a multi-year fiber build, spending ahead of the revenue. The bet is that mature fiber throws off high-margin, low-maintenance-capex cash once the build completes (~2029-2030), and that the $100M run-rate cost program (by 2028) flows partly to the bottom line. Array, by contrast, already converts EBITDA to cash at ~85% (tower capex is tiny) — classic tower economics.

3.3 Returns on capital

• Array is a tower business: high incremental margins, low capex, but it is early — adjusted EBITDA of $194M against several billion of tower + spectrum + partnership assets implies a low current ROIC that should rise sharply as (a) naked towers lease up at near-100% incremental margin and (b) cost wind-down completes. The economics of a mature tower are excellent (think 60%+ tower cash-flow margins); Array is mid-transition toward that.
• TDS Telecom targets mid-teens unlevered returns on new fiber edge-out builds (management's stated hurdle). At maturity, fiber is a high-ROIC annuity; today it is sub-cost-of-capital because of the build drag. The honest read: returns are prospective, not demonstrated.
• Consolidated ROIC vs. WACC: currently below WACC on a trailing basis (transition); the thesis requires forward ROIC to clear an ~8% WACC, which is credible for towers and plausible-but-unproven for fiber.

3.4 Balance sheet — fortress, finally

After the August 2025 wireless sale and debt exchange (T-Mobile assumed $1,680M of Array notes), consolidated long-term debt fell from $2.48B (FY2024) to $0.84B (FY2025) and ~$0.67B by Q1 2026. Cash rose to $1.37B (Q1 2026) after TDS received its $725.6M pro-rata share of Array's Feb-2026 special dividend. TDS repaid its last $150M term loan in Jan 2026. The parent is net cash; remaining debt is largely long-dated Array senior notes (2069/2070 maturities) and modest term loans. Interest coverage is no longer a concern. This is the cleanest TDS balance sheet in decades and removes the financial-leverage leg of the bear case.

3.5 Valuation — see Section 6 (sum-of-the-parts is the method)

4. Phase 3 — Moat analysis

TDS itself has no moat — it is a holding vehicle. The moats, such as they are, live in the parts:

• Array towers — Narrow moat (local monopoly geography). ~1/3 of towers have no competing structure within two miles, and zoning/permitting makes new builds hard. Switching costs are high (a carrier's radios are bolted to the steel; moving is expensive and disruptive — Array noted only one tenant churn in all of Q1 2026). But Array is sub-scale vs. American Tower / Crown Castle / SBA, has a large block of tenantless towers of uncertain value, and lost its anchor (UScellular) tenant — so the moat is real per-tower but thin at the portfolio level.
• TDS Telecom fiber — Narrow, emerging. First-to-fiber in rural/exurban clusters confers a durable local advantage: once you pass a home with fiber, the overbuilder's returns collapse. The A-CAM federal support (~300k addresses) subsidizes uneconomic routes. But cable competitors are upgrading to multi-gig, fixed wireless and satellite nibble at rural demand, and TDS is a small player nationally.
• Spectrum & partnership stakes — Regulatory scarcity. C-band is genuinely scarce, licensed, mid-band 5G spectrum with a mature ecosystem; that is a regulatory moat by definition. The minority partnership interests are irreplaceable passive cash streams.

Durability test. Towers: 15-20 yr leases, inflation escalators — durable. Fiber: a 20-30 yr physical asset once built — durable if penetration holds. Spectrum: durable but a depleting opportunity (you sell it once). Net: the underlying assets are durable; the holdco adds no durable advantage and arguably subtracts (discount + complexity).

5. Phase 4 — The catalyst and the superinvestor signal

The catalyst is explicit and dated. In Q1 2026 TDS proposed to acquire the 18% of Array it does not own in an all-stock merger at 0.86 TDS shares per Array share, assuming the pending spectrum sales close and Array pays a further **$10.40/share (~$900M) special dividend** to Array holders first. This is the holdco actively simplifying itself — eliminating duplicative costs, collapsing two public entities into one, increasing liquidity. Combined with:

• Verizon spectrum sale (~$1.0B gross) closing Q2/Q3 2026 -> another Array special dividend, 82% to TDS;
• remaining T-Mobile spectrum (~$171M) closing through 2026;
• a $520M TDS buyback authorization outstanding;

...the next 12-18 months contain multiple discrete events that can convert "trapped" asset value into cash at the parent and shrink the discount.

Superinvestor signal (honest read). Howard Marks / Oaktree increased their TDS position +16% in Q1 2026 — into exactly this catalyst window. Marks is the dean of "it's not what you buy, it's what you pay," and a controlled holdco selling assets above carrying value at a discount to NAV is textbook Oaktree. That said: Marks is a distressed/credit-anchored value investor comfortable with multi-year, lumpy, governance-dependent situations and large positions sized to a portfolio I cannot see. His buy validates the type of opportunity; it does not change the arithmetic that the stub is already partly priced in after a +426% three-year move. I weight the signal as confirmation, not as a reason to overpay.

6. Valuation — sum-of-the-parts (the only honest method)

All figures from FY2025 10-K, Q1 2026 balance sheet, and 2026-06-05 market quotes (AD $50.45, mkt cap $4.435B).

Mark-to-market check (what the market implies today):

• TDS market cap: $4.45B (113.7M sh x $39.16)
• 82% of Array (AD) at market: $3.64B
• Implied stub (TDS Telecom + parent net cash): $0.82B
• TDS Telecom alone at a conservative 6x its $330M EBITDA = $1.98B, before counting any parent cash.
• Conclusion: the market is paying ~$0.8B for a fiber business worth ~$2.0-2.6B plus parent net cash — a ~30-40% holdco discount, or it disbelieves the Array (AD) price, or both.

Scenario SOTP (per economic share, 113.7M):

Sensitivity. The swing factors are (1) the multiple on fiber EBITDA (6x->9x moves NAV ~$9/share) and (2) the assumed holdco/tax friction (5%->20% moves NAV ~$10/share). The Array stake is marked to a live, liquid market price, so the largest subjective lever is how much of the discount you believe collapses.

Fair value range: $38-$60; base ~$49. Current $39.16 sits at the bottom of that range — essentially the conservative case. That means: limited downside if you trust the AD market price and a ~$2B fiber valuation, but only ~25% upside to base and you are buying after the easy money (the +426% re-rating) has been made.

7. Synthesis, position sizing, and entry discipline

Expected-return tree (3-year horizon):

• 35% — discount closes toward base NAV + fiber proves out -> ~$55-60 -> +45-55%
• 40% — partial discount close, fiber grinds, Array flat -> ~$45 -> +15%
• 25% — discount persists, AD de-rates, fiber disappoints -> ~$30 -> -23%

Probability-weighted ~ +18% over three years (~6%/yr) before special dividends — adequate, not exceptional. The kicker is optionality: a full Array merger + C-band sale + buybacks at sub-NAV could compound faster than the base.

Why WAIT, not BUY. Three honest reasons: (1) at $39 you pay essentially conservative NAV — the margin of safety is thin; (2) the consolidated business currently earns below its cost of capital and the high-return future (mature fiber, leased-up towers) is prospective; (3) family control means the discount can persist indefinitely if management chooses — the catalyst is proposed, not closed. I want to be paid for those risks.

Entry discipline.

• Strong Buy < $28 — ~30% below conservative NAV; the level where you are paid for governance and execution risk with a true margin of safety (this was roughly the price before the catalyst was recognized; the 52-wk low was ~$25).
• Accumulate < $34 — ~10-13% below conservative NAV; a fair entry for a patient holder who trusts the catalyst.
• Hold/observe $34-$45 — fairly valued given risks; let the catalyst de-risk it.
• Trim/avoid > $52 — at/above base NAV; the discount has closed and you are paying for execution not yet delivered.

Position size: 1-2% if entered in the accumulate zone (special-situation sleeve), reflecting real but bounded downside (net-cash balance sheet + AD market floor) against governance/discount-persistence risk.

8. Monitoring triggers

• Array merger outcome — special-committee recommendation, exchange-ratio changes, shareholder votes. A consummated merger at/near 0.86 collapses the structure and is bullish; a rejection/renegotiation that entrenches the discount is bearish.
• Verizon + remaining T-Mobile spectrum closings and the size/timing of the next Array special dividend (~$10.40/sh expected).
• C-band monetization — any sale of retained C-band at "fair value" is a large, un-modeled positive.
• TDS Telecom fiber KPIs — address delivery (target 200-250k/yr), fiber net adds (track penetration), and progress toward the $100M-by-2028 cost program. Watch EBITDA inflection as capex peaks.
• Naked-tower lease-up — T-Mobile's committed-site selection (by Jan 2028) and the fate of 800-1,800 tenantless towers; lease-up validates the bull case, decommissioning costs validate the bear.
• Capital allocation — buybacks executed below NAV (good) vs. overpriced fiber M&A (watch). Insider/Marks position changes in 13Fs.

Primary-source citations throughout: TDS FY2025 Form 10-K (SEC EDGAR, filed 2026-02-24, CIK 0001051512) — 82.0% Array ownership, 4,450 towers, segment Adjusted EBITDA (TDS Telecom $330.3M, Array $194.3M), total long-term debt $843.6M, cash $766.0M, TDS shareholders' equity $4,801.6M, special dividends ($23.00 Aug-2025; $10.25/$885.5M Jan-2026, $725.6M to TDS), spectrum sale table (Verizon $1,000.0M, AT&T $1,018.0M, T-Mobile $85.0M + $86.4M); TDS Q1 2026 and Q4 2025 earnings calls (merger proposal 0.86x, ~$10.40/sh planned dividend, DISH non-payment, fiber and tower guidance); AlphaVantage market data (TDS, AD, UZD quotes 2026-06-05). No sell-side research used.