How Much Does IBM Stock Move When The Market Moves?

International Business Machines (IBM) has risen 6.0% over the last five trading days while the S&P 500 fell 1.3%. A run like that in a weak market pulls money in, but the five-day move is not the question worth answering. What matters is what IBM does to your money when the market moves. Most of what IBM does has little to do with the market.

IBM Has Taken More Of The Bad Days Than The Good

On days the S&P 500 rose over the past year, IBM captured about 83% of the gain. On days the index fell, IBM took about 102% of the loss. That is a one-year reading of daily moves. For investors evaluating a recent breakout, an asymmetric downside capture ratio warrants closer inspection.

IBM is not a quiet stock. Over the past five years it ran 30.3% annualized volatility against 17.2% for the S&P 500. Its daily moves have tracked the index with a correlation of only 0.36 across those five years, so most of that movement is IBM’s own. Independence like that comes from what IBM sells, and when its customers buy.

Why IBM’s Large Clients Put Off Their Software Deals

Software is nearly 45% of IBM’s revenue, and about 80% of that software revenue is recurring, coming from subscription and consumption products like Red Hat, HashiCorp and Confluent. The other 20% is transactional. Large clients buy the mainframe and its software stack on enterprise license agreements, generally treated as capital spending.

That last 20% is what slipped in the second quarter of 2026. Management says many clients redirected spending toward servers, storage and memory to secure supply-constrained infrastructure ahead of expected price increases. Tens of large deals did not close on time, and transaction processing revenue fell 9% while data grew 18%.

The recurring side was largely unaffected, and about a third of the slipped deals have since closed. The timing of those contracts is what moved the quarter, and the index has no view on that.

Has IBM Paid Its Owners For The Swing?

Over the past five years, yes. IBM returned 18.0% annualized against 12.8% for the S&P 500. The risk-adjusted gap is small: IBM’s five-year Sharpe ratio is 0.58 against 0.55 for the index, a measure of return earned above the risk-free rate per unit of volatility. The last stretch has been harder. IBM trades about 24% below its 52-week high.

What IBM adds to a portfolio is a return stream that mostly does not move with the index. The ride is bigger. Over the past year that ride cost more on the market’s bad days than it paid on its good ones.

So How Much IBM Should You Own?

Still a difficult question, isn’t it? And it is the one you cannot answer unless you look at the rest of your portfolio. Is the stock adding to your portfolio risk or reducing it? What about returns? Is there a better alternative?

Sounds complicated, but that is just a flavor of the kind of thinking that goes into a market beating portfolio. Since its inception, our rule-based High Quality Portfolio has outperformed its benchmark, a blend of three major indices.

Or if you want names that hold up when the index falls, our Drawdown Defenders screen ranks them.