Stock Options and RSUs Explained for Investors

When a technology company reports $5 billion in profit but also issued $2 billion worth of shares to its employees, how much did it really earn? This question sits at the heart of one of the most contentious topics in financial analysis: stock-based compensation. Whether you're evaluating a potential investment or trying to understand your own equity grants, understanding how options and RSUs work — and how they affect shareholders — is essential.

Stock Options: The Basics

A stock option gives an employee the right to buy company shares at a predetermined price (the "strike price" or "exercise price") at some point in the future. If the stock price rises above the strike price, the option is valuable — the employee can buy shares at the lower strike price and immediately sell at the higher market price, pocketing the difference.

Options typically vest over four years, meaning the employee earns the right to exercise them gradually. A standard schedule might vest 25% after the first year and the remaining 75% monthly over the next three years. This vesting structure serves as a retention tool — leave before your options vest, and you forfeit them.

From an investor's perspective, the critical issue is dilution. When employees exercise their options, new shares are created and issued. The total number of shares outstanding increases, and each existing share represents a smaller ownership stake in the company. The company's total earnings are now divided among more shares, reducing earnings per share.

Options were the dominant form of equity compensation for decades, particularly in Silicon Valley. They carry asymmetric payoff — if the stock rises, the employee profits handsomely; if it falls below the strike price, the options are worthless ("underwater") but the employee loses nothing except the opportunity cost. This asymmetry created incentive problems: executives with large option grants were motivated to take excessive risks, since they shared in the upside but not the downside.

Restricted Stock Units: The Modern Standard

RSUs have largely replaced stock options at most large public companies. An RSU is a promise to deliver shares of company stock to the employee upon vesting. Unlike options, RSUs don't have a strike price — they're worth the full market value of the shares when they vest.

This means RSUs always have value as long as the stock has value. An employee with options at a $150 strike price gets nothing if the stock drops to $100. An employee with RSUs worth 1,000 shares still receives $100,000 worth of stock. This makes RSUs more reliable as compensation, which is why employees generally prefer them, and why companies find them more effective for retention.

The dilution mechanics are similar to options. When RSUs vest, new shares are issued (or treasury shares are released), increasing the share count and diluting existing shareholders. The key difference is that RSU dilution is more predictable — since RSUs always have value, they're almost always exercised, whereas options may expire worthless if the stock underperforms.

The Accounting Controversy

Under current accounting rules (ASC 718), companies must expense stock-based compensation on their income statement. The expense is calculated using models that estimate the fair value of the grants at the time they're issued. This reduces reported GAAP earnings.

Many companies, particularly in the technology sector, prominently report "adjusted" or "non-GAAP" earnings that add back stock-based compensation. Their argument: stock-based comp is a non-cash expense that doesn't reflect the company's actual cash-generating ability. The cash flow statement, they note, is unaffected by stock-based comp.

The counter-argument is compelling. Stock-based compensation is a real economic cost to shareholders — it dilutes their ownership. If the company didn't pay employees with stock, it would need to pay them more in cash, which would reduce free cash flow. Treating stock-based comp as a non-expense is essentially saying that employee compensation doesn't count as a cost of doing business, which is absurd on its face.

Warren Buffett has been particularly vocal on this point, calling the exclusion of stock-based compensation from adjusted earnings a deception. The dilution is real, the economic cost is real, and investors who ignore it are overstating the company's profitability.

What Investors Should Watch

Track the fully diluted share count over time. This number, found in the company's SEC filings, includes all outstanding options and unvested RSUs. If the fully diluted share count is growing by 2% or more per year, stock-based compensation is meaningfully eroding your ownership stake.

Compare stock-based compensation expense to total revenue and to operating cash flow. A company where SBC represents 3% of revenue is managing dilution reasonably. A company where SBC represents 15% of revenue is essentially paying a significant portion of its operating costs in stock rather than cash — and shareholders are footing the bill through dilution.

Look at whether the company is buying back shares to offset dilution. Many companies run buyback programs specifically to keep the share count flat despite ongoing equity grants. This is better than unchecked dilution, but recognize what's happening: shareholder capital (used for buybacks) is funding employee compensation. The true cost isn't zero — it's the cash spent on repurchases.

Compare GAAP earnings to adjusted earnings. If the gap is large and driven primarily by stock-based compensation add-backs, treat the adjusted numbers with skepticism. The GAAP figures, while imperfect, give a more honest picture of the company's actual profitability after accounting for all forms of employee compensation.

Impact on Fair Value Estimates

Stock-based compensation affects fair value calculations in subtle ways. Because SBC is a non-cash charge, it makes reported net income lower than cash earnings. Our fair value formula adds back depreciation and amortization (non-cash charges) but uses net income as the starting point — which already includes SBC expense. This means the formula implicitly accounts for SBC by starting from a net income figure that's been reduced by the compensation cost.

The share count used in the per-share calculation also matters. Fair value per share is only meaningful if the share count accurately reflects dilution. A company that looks cheap on a per-share basis might not be if the share count is about to increase substantially from vesting RSUs and option exercises.