Comparing two companies side by side is one of the most useful habits in research. A figure such as a P/E of 17 or a return on equity of 30% means little on its own; next to a similar company, it starts to tell a story. This article sets out a simple five-step way to compare two companies, using real pairs from PositoAI's data, and the traps that make comparisons misleading.
Compare like with like
The first rule is to compare companies that do similar work. Two IT services firms, two private banks or two soft-drink makers face similar customers, costs and rules, so differences between them are meaningful. Comparing a bank with a software company, or a utility with a fashion brand, mostly shows how their industries differ, not which company is run better.
It also helps to use the same period for both: the same financial year, or the same quarter compared with a year earlier.
Step 1: size
Market value (market capitalisation) shows how large each company is in the market's eyes. Size alone is not good or bad, but a much larger company often has more stable business and wider reach, while a smaller one may have more room to grow and more risk.
Step 2: valuation
P/E shows how much investors pay for each unit of yearly profit; P/B compares the market value with net worth. Within the same industry, a higher figure usually means the market expects more growth or quality, or is simply more optimistic. A lower figure can mean the opposite, or a business the market is overlooking.
Step 3: profitability and cash
Return on equity (ROE) shows how much profit a company earns on shareholders' money. PositoAI's Profit Cash Ratio shows how much of the reported profit over three years actually arrived as operating cash. Profit that turns into cash is generally stronger than profit that stays on paper.
Example on PositoAI: TCS vs Infosys, India
On 20 Oct 2026, TCS had about twice the market value of Infosys. TCS traded at a P/E of about 17.3 and Infosys about 15.4; their P/B figures were further apart, about 8.3 against 5.0, partly because TCS earned a higher ROE (about 45.6% against 32.0%).
Both owed about ₹0.41 for every ₹1 they owned. Over three years, TCS's sales grew about 18% and Infosys's about 11%, while Infosys turned more of its profit into operating cash (about 120% of profit against 101%) and had a higher dividend yield (about 4.9% against 2.2%). Neither company wins on every measure, which is usual.
Step 4: debt
PositoAI's Owes vs Owns figure compares what a company owes with what it owns. For two similar companies, a much higher figure for one means it relies more on borrowed money, which can raise returns in good years and strain in bad ones. Banks are compared only with banks, since deposits count as money they owe.
Step 5: growth and dividends
Sales growth over several years shows whether the business is getting bigger. Dividend yield shows how much cash the company pays out each year compared with its share price. A company paying out a lot may be growing more slowly, and the reverse; the two are worth reading together.
Example on PositoAI: Coca-Cola vs PepsiCo, US
Coca-Cola had about 2.2 times the market value of PepsiCo and a much higher P/E, about 28.1 against 16.8. PepsiCo showed a higher ROE (about 52% against 42%), a higher dividend yield (about 4.5% against 2.3%) and turned more of its profit into operating cash over three years (about 141% against 75%). Coca-Cola's sales grew a little faster, about 11.5% over three years against 8.7%, and it owed less compared with what it owned (about 0.65 against 0.80). (As on 20 Oct 2026.)
Traps to watch
Mergers and one-off events. A merger can make growth look far higher than the business alone achieved.
Very small net worth. When years of buybacks shrink a company's net worth, ROE and P/B can look extreme or even turn negative, and stop being useful for comparison.
Different year-ends and currencies. Indian companies usually close their year in March; many US companies in December. Ratios such as P/E work across currencies; raw amounts need converting first.
Example on PositoAI: when figures stop comparing well
HDFC Bank's three-year sales growth of about 60% partly reflects its 2023 merger with its parent HDFC Ltd, so it is not the same kind of growth as ICICI Bank's 65%. In the US, Mastercard showed an ROE of about 241% against Visa's 61%, mainly because Mastercard's net worth is small after large buybacks, and Lowe's showed a negative P/B because it owes more than it owns. In such cases, other measures such as Owes vs Owns and Profit Cash give a fairer comparison. (As on 20 Oct 2026.)
Common misconceptions
"The company that wins on more measures is better." Measures are not equally important for every business, and a single serious weakness can matter more than several small strengths.
"A cheaper P/E means the better choice." It may reflect slower growth or higher risk.
"One year is enough." Looking at several years shows whether a gap is lasting or temporary.
Frequently asked questions
Can I compare companies from different countries?
Yes, with ratios such as P/E, ROE and Owes vs Owns, keeping in mind that markets and accounting rules differ.
How many companies should I compare?
Two or three similar companies are usually enough to see what is normal for an industry.
Which measure matters most?
It depends on the industry: cash and debt matter more for heavy industries, loan quality for banks.
Does PositoAI say which company is better?
No. It shows the figures side by side; the judgment stays with the reader.
How to use this on PositoAI
The Compare page puts up to three companies side by side, with their Positivity Score, rank in their own country and key figures. Each company's PosiFunda page adds peer comparisons within its sector, and PositoAI's Positivity Score gives one combined view. PosiStep 14 of PosiCourse, PositoAI's free stock market course, explains the key ratios.
Suggested reading
How to Use a Stock Screener · What Is the P/E Ratio? · What Is the P/B Ratio? · How to Understand Company Debt · What is Market Capitalization?
Summary
A fair comparison sets two similar companies side by side over the same period and looks at five things: size, valuation, profitability and cash, debt, and growth with dividends. Usually neither company wins on every measure. Mergers, very small net worth, different year-ends and currencies can distort figures, so it helps to check which measures still compare fairly before drawing conclusions.