O-I Glass, Inc. (NYSE:OI) shareholders should be happy to see the share price up 13% in the last month. But in truth the last year hasn't been good for the share price. In fact, the price has declined 33% in a year, falling short of the returns you could get by investing in an index fund.

The recent uptick of 6.2% could be a positive sign of things to come, so let's take a look at historical fundamentals.

To quote Buffett, 'Ships will sail around the world but the Flat Earth Society will flourish. There will continue to be wide discrepancies between price and value in the marketplace...' One imperfect but simple way to consider how the market perception of a company has shifted is to compare the change in the earnings per share (EPS) with the share price movement.

During the last year O-I Glass saw its earnings per share drop below zero. Buyers no doubt think it's a temporary situation, but those with a nose for quality have low tolerance for losses. Of course, if the company can turn the situation around, investors will likely profit.

You can see how EPS has changed over time in the image below (click on the chart to see the exact values).

It's probably worth noting we've seen significant insider buying in the last quarter, which we consider a positive. On the other hand, we think the revenue and earnings trends are much more meaningful measures of the business. This free interactive report on O-I Glass' earnings, revenue and cash flow is a great place to start, if you want to investigate the stock further.

A Different Perspective

O-I Glass shareholders are down 33% for the year, but the market itself is up 27%. Even the share prices of good stocks drop sometimes, but we want to see improvements in the fundamental metrics of a business, before getting too interested. Longer term investors wouldn't be so upset, since they would have made 5%, each year, over five years. It could be that the recent sell-off is an opportunity, so it may be worth checking the fundamental data for signs of a long term growth trend. 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. Take risks, for example - O-I Glass has 1 warning sign we think you should be aware of.

O-I Glass is not the only stock insiders are buying. So take a peek at this free list of small cap companies at attractive valuations which insiders have been 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.