AT&T INC.

AT&T INC. (T) — Investment Memo

🐂 The Bull Case (Warren's voice)

• The Utility Tollbooth: AT&T is a modern digital toll road. In the 21st century, a smartphone connection is more essential to a household than running water or electricity. Customers will cut back on food, travel, and clothes before they stop paying their monthly wireless bill.
• The Scale Moat: The barrier to entry is massive. No competitor can build a competing nationwide wireless or fiber network today for less than $100.0B. This is a regulated three-player oligopoly (T, VZ, TMUS) with rational competitive dynamics, ensuring a permanent floor on service demand.
• The High-Margin Engine: Underneath the messy corporate history lies a clean, high-margin Mobility business with recurring subscription cash flows. Once the fiber trunk lines are buried, the incremental cost of adding a customer is near zero, generating exceptional cash margins on every incremental dollar.
• The Real Value Price: While the speculative DCF model suggests an intrinsic value of $88.85 per share, Berkshire does not buy into 15% growth projections for mature utilities. To us, this business becomes attractive when priced as a steady-state, zero-growth bond proxy—specifically, when the market capitalization drops below the tangible asset value of the network infrastructure itself.

🐻 The Bear Case (Charlie inverts)

• "Show me where I'll die and I won't go there." AT&T is a business designed to break an investor's heart. It is trapped on a capital-intensive treadmill where it must spend billions of dollars every year just to stand still.
• The Capex Treadmill of Death: AT&T must continuously plow billions into 5G, 6G, and Fiber upgrades. This capital does not buy growth; it merely buys the right to prevent customer churn. Every dollar of cash flow is immediately reinjected into the ground, leaving little for the owners.
• The Debt Anchor: Carrying $134.7B in debt is a terminal disease in a high-interest-rate environment. Management does not work for the equity holders; they are a collection agency for the bond syndicate. A business that must constantly borrow to pay its dividend is not compounding—it is liquidating in slow motion.
• The Technology Bypass: Fixed Wireless Access (FWA) and Low Earth Orbit (LEO) satellite constellations represent structural, permanent threats. If connectivity can be delivered reliably from the air without digging trenches, AT&T’s multi-billion-dollar ground infrastructure transforms overnight from an irreplaceable asset into an expensive liability.

💰 Valuation & Margin of Safety

• The Speculative DCF Estimate: $88.85 per share (totaling $622.0B). We view this 15.0% FCF growth assumption as a total accounting fantasy for a business with a -1.5% revenue CAGR.
• 25% Margin of Safety Entry: $66.64 per share.
• 50% Margin of Safety Entry: $44.43 per share.
• The Berkshire Reality Check: Given the structural headwinds and the massive debt load, our conservative intrinsic value is closer to $22.00 per share. The stock is currently trading near fair value relative to its low-growth utility reality, but offers zero margin of safety when adjusted for its $134.7B debt liability.

Verdict: PASS

We are passing on AT&T because its enormous debt load and infinite capital expenditure requirements leave no margin of safety for equity holders. While the core wireless service functions as a durable utility, the moat is continually eroded by rapid technological shifts and poor historical capital allocation. There are far easier ways to make a dollar than betting on an indebted giant running as fast as it can on a treadmill just to stay in place.