Revenue
Revenue is the total income a company earns from its primary business activities — selling products, providing services, or a combination of both — before any expenses are deducted.
Revenue, also called the 'top line,' is the starting point of the income statement and every profitability calculation flows from it. It represents the full amount billed to customers before any deductions for costs, and is distinct from profit: a company can have enormous revenue while still losing money if its costs are equally large or larger. Amazon's retail segment has generated hundreds of billions in revenue while operating at paper-thin margins for most of its history.
Revenue recognition rules under GAAP (ASC 606) require that revenue be recognized when — and only when — the performance obligation to the customer is satisfied, not necessarily when cash changes hands. A software company that sells a two-year license upfront must defer a portion of that revenue and recognize it evenly over the contract period. This distinction between 'bookings' (orders signed), 'billings' (amounts invoiced), and 'revenue' (amounts recognized) is particularly important in enterprise software and subscription businesses.
For Apple, revenue breaks down into products (iPhone, Mac, iPad, accessories) and services (App Store, Apple Music, iCloud, Apple TV+). As iPhone growth matured, the services segment — which carries far higher gross margins — became the key revenue growth driver watched closely by analysts. In fiscal 2024, Apple's services revenue crossed $100 billion annually, making it equivalent to a Fortune 50 company on its own.
Organic vs. inorganic revenue growth is a critical distinction. Organic growth comes from the underlying business — more customers, higher prices, new products. Inorganic growth comes from acquisitions. When Microsoft acquired Activision Blizzard, its gaming revenue jumped immediately, but the market carefully separates this from the organic growth rate of the core business. Acquisitive growth is generally valued less highly than organic growth because it requires capital and carries integration risk.
Revenue quality also matters. Recurring subscription revenue is more valuable and more predictable than one-time product sales. A company with $5 billion in annual recurring revenue (ARR) growing at 20% often commands a higher valuation than a company with $10 billion in lumpy product revenue growing at 5%, because predictability reduces risk and the compounding math on high-growth ARR is compelling.