The worst result, after buying shares in a company (assuming no leverage), would be if you lose all the money you put in. But on a lighter note, a good company can see its share price rise well over 100%. Long term Westlake Corporation (NYSE:WLK) shareholders would be well aware of this, since the stock is up 128% in five years. It's down 3.4% in the last seven days.

While this past week has detracted from the company's five-year return, let's look at the recent trends of the underlying business and see if the gains have been in alignment.

While markets are a powerful pricing mechanism, share prices reflect investor sentiment, not just underlying business performance. One way to examine how market sentiment has changed over time is to look at the interaction between a company's share price and its earnings per share (EPS).

During five years of share price growth, Westlake actually saw its EPS drop 15% per year.

Essentially, it doesn't seem likely that investors are focused on EPS. Because earnings per share don't seem to match up with the share price, we'll take a look at other metrics instead.

We doubt the modest 1.4% dividend yield is attracting many buyers to the stock. In contrast revenue growth of 14% per year is probably viewed as evidence that Westlake is growing, a real positive. It's quite possible that management are prioritizing revenue growth over EPS growth at the moment.

The graphic below depicts how earnings and revenue have changed over time (unveil the exact values by clicking on the image).

Westlake is well known by investors, and plenty of clever analysts have tried to predict the future profit levels. Given we have quite a good number of analyst forecasts, it might be well worth checking out this free chart depicting consensus estimates.

What About Dividends?

As well as measuring the share price return, investors should also consider the total shareholder return (TSR). The TSR incorporates the value of any spin-offs or discounted capital raisings, along with any dividends, based on the assumption that the dividends are reinvested. So for companies that pay a generous dividend, the TSR is often a lot higher than the share price return. In the case of Westlake, it has a TSR of 145% for the last 5 years. That exceeds its share price return that we previously mentioned. And there's no prize for guessing that the dividend payments largely explain the divergence!

A Different Perspective

Westlake provided a TSR of 11% over the last twelve months. But that was short of the market average. If we look back over five years, the returns are even better, coming in at 20% per year for five years. It may well be that this is a business worth popping on the watching, given the continuing positive reception, over time, from the market. I find it very interesting to look at share price over the long term as a proxy for business performance. But to truly gain insight, we need to consider other information, too. For example, we've discovered 2 warning signs for Westlake that you should be aware of before investing here.

We will like Westlake better if we see some big insider buys. While we wait, check out this free list of undervalued stocks (mostly small caps) with considerable, recent, insider buying.

Please note, the market returns quoted in this article reflect the market weighted average returns of stocks that currently trade on American exchanges.

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.