Most investors start with price. We start with the business. A stock that looks inexpensive on a headline multiple is often inexpensive for a reason the multiple cannot show you — a customer concentration problem, a debt maturity wall, an accounting policy that flatters this year at next year's expense.
The first filter is simple comprehension. Can we explain, in two plain sentences, how this company converts effort into cash? If the answer requires jargon or a diagram, that is itself a finding. Complexity is where unpleasant surprises hide, and it is remarkable how many widely held names fail this test.
The second filter is cash conversion. Reported earnings are an opinion shaped by accounting choices; cash flow is closer to a fact. We compare operating cash flow against net income over a full cycle, not a single quarter. Persistent gaps between the two are worth understanding before, rather than after, you own the shares.
The third filter is the balance sheet — specifically, what happens under stress. We are less interested in today's leverage ratio than in when the debt comes due, what it costs to refinance, and whether the business can service it in a bad year rather than a good one.
The fourth filter is competitive position. Durable returns require a reason competitors have not already competed them away: switching costs, scale, a regulatory position, a genuine brand. Absent one, high margins are a countdown, not a moat.
The fifth filter, and only the fifth, is valuation. Price matters enormously — but it is the last question, not the first. A wonderful business at an unforgiving price is a bad investment, and a poor business at any price is usually still a poor investment.
Disclaimer: J.J Stock Research publishes general market research and educational content. Nothing on this site is personalised investment advice, an offer to buy or sell any security, or a guarantee of any result. Investing involves risk, including the possible loss of principal.