Fundamental Analysis
ES: Análisis Fundamental PT: Análise Fundamentalista
Estimating what a business is worth from its accounts and competitive position, and what to do with that estimate when the market disagrees.
The question it tries to answer
Fundamental analysis seeks to estimate an asset’s intrinsic value — what it would be worth if you could calculate it without looking at the quote — and compare that with its market price. The underlying thesis is that price and value diverge frequently and converge over time, so buying below estimated value and selling above it produces returns. It is a long-horizon discipline by construction: nothing guarantees when the gap will close, and it can widen for years before it does. Anyone unable to sustain that wait — by timeframe, by leverage or by temperament — cannot exploit the edge even if their analysis is correct.
The three financial statements and what each shows
Everything begins with three documents that must be read together. The income statement shows revenue, margins and profit for a period: it tells you whether the business makes money and how efficiently. The balance sheet shows assets, liabilities and equity at an instant: it tells you whether the business is solid and how much debt it carries. The cash flow statement shows the money that actually came in and went out: it tells you whether accounting profit converts into cash. The rule that prevents the most trouble is this: when accounting profit and cash flow diverge persistently, believe the cash flow. Profit allows recognition policies and provisions; cash is far harder to dress up.
Ratios: what each block is for
Ratios turn absolute figures into comparables. Valuation ratios — P/E, P/B, EV/EBITDA, P/S — place price against some measure of the business and only mean something compared with the company’s own history and its direct competitors, never in the abstract. Profitability ratios — ROE, ROA, ROIC, margins — measure business quality, and ROIC against cost of capital is probably the most informative of all: it tells you whether the company creates or destroys value by growing. Solvency ratios — debt to equity, interest coverage, current ratio — measure the ability to survive a bad year. And efficiency ratios — inventory turnover, cash conversion cycle — measure how well the company manages working capital.
The qualitative side, which usually matters more
The numbers describe the past; what determines the future is largely qualitative. Four questions organise this block. Does the company have a competitive moat — brand, network effects, switching costs, scale advantage — allowing it to sustain high returns against competition? How does management allocate capital: buying back expensive stock, making value-destroying acquisitions, reinvesting sensibly? Where is the sector in its cycle and what disruptions threaten it? Are there regulatory or concentration risks — a single customer, a single product, a single jurisdiction — that could change the thesis overnight? An immaculate balance sheet does not protect against a technological shift that makes the business irrelevant.
How an options trader uses it
Although it was born for long-term investing, fundamental analysis serves concrete functions in options trading. First and most important: selecting the universe. Selling puts on a company you would be willing to own is an entirely different trade from selling them on one you do not know, because it changes the meaning of assignment: from accident to acceptable outcome. Second: assessing tail risk: a heavily indebted company with negative cash flow has a real probability of falling 40% in a session, and that probability is not well captured by models assuming normal distributions. Third: contextualising volatility: high IV in a solid company with no catalysts is usually an opportunity; the same IV in a company with solvency problems is a fair price.