Chapter 3 · Moat

It still runs the world's banks. You don't switch that off.

IBM's moat is deep entrenchment — mainframes, Red Hat, and contracts that lock in years of future revenue.

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✦ The bottom line

IBM's moat is entrenchment. Its mainframes and software run mission-critical systems for the world's largest banks, airlines, and governments — and Red Hat's open-source platform sits underneath countless companies' cloud setups. The proof of stickiness: IBM holds $71B in contracted future revenue (backlog), up from $63B.

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✦ Teach me

Why customers don't leave

IBM's systems are woven into the most critical, least-replaceable operations a company has — the software that clears payments, books flights, or runs a government agency. Replacing them carries enormous cost and risk, so customers rarely do. One way to see this stickiness is backlog (in accounting terms, 'remaining performance obligations'): revenue customers have already committed to pay IBM in future years. A large, growing backlog means revenue that's effectively already booked.

Mission-critical entrenchment is one of the most durable moats there is — it's why IBM survived a decade of decline without losing its core customers. A growing backlog signals that durability is intact, even improving.

Backlog shows customers are committed. The quality of that business shows up in margins — how much of each revenue dollar IBM keeps as gross profit. A high, rising gross margin signals IBM is shifting toward its most valuable, software-led work.

Strong