Apple became the first publicly traded US company to reach a one trillion dollar market capitalisation on August 2, 2018. The stock had risen through the day and crossed the threshold in afternoon trading. There was no ceremony. The number appeared on a ticker and the coverage that followed tried to make sense of what it meant.
A market cap of one trillion dollars is a measure of what investors collectively believe a company is worth at a given moment. It is not a measure of revenue, profit, assets, or any other concrete financial metric. It is a number that says if you could buy every share of Apple at today's price, you would pay one trillion dollars. What makes that interesting is less the number itself and more what it implies about the expectations built into it.
Apple's business in 2018 was not fundamentally different from what it had been five years earlier. It made iPhones, which accounted for most of its revenue. It made Macs and iPads. It ran an App Store. It sold services. The iPhone was ageing as a category in the sense that growth was coming from higher average selling prices rather than dramatically more units sold. The underlying business was excellent but not obviously transformative.
What the trillion-dollar valuation reflected was the Services business that Apple had been building and analysts had been trying to model. The App Store, Apple Music, iCloud, Apple Pay, and the other subscription and transaction businesses were generating increasingly significant revenue at very high margins. If the iPhone was eventually going to stop growing as a hardware product, the services layer built on top of hundreds of millions of active devices was the argument for why the company's earnings would continue to grow.
There was also a more straightforward answer. Apple had spent years returning cash to shareholders through buybacks, reducing its share count, which increased earnings per share mechanically. The company was highly profitable, generated enormous free cash flow, and had a brand that commanded pricing power most companies could not approach.
The milestone attracted questions about whether a one-trillion-dollar company could continue growing and how long a single product could remain the centre of a business at that scale. Both were reasonable questions. Neither had an obvious answer in August 2018.