It's nice to see the China Shengmu Organic Milk Limited (HKG:1432) share price up 13% in a week. Meanwhile over the last three years the stock has dropped hard. Tragically, the share price declined 63% in that time. So it's good to see it climbing back up. After all, could be that the fall was overdone.

While the last three years has been tough for China Shengmu Organic Milk shareholders, this past week has shown signs of promise. So let's look at the longer term fundamentals and see if they've been the driver of the negative returns.

See our latest analysis for China Shengmu Organic Milk

In his essay The Superinvestors of Graham-and-Doddsville Warren Buffett described how share prices do not always rationally reflect the value of a business. By comparing earnings per share (EPS) and share price changes over time, we can get a feel for how investor attitudes to a company have morphed over time.

Over the three years that the share price declined, China Shengmu Organic Milk's earnings per share (EPS) dropped significantly, falling to a loss. Extraordinary items contributed to this situation. Due to the loss, it's not easy to use EPS as a reliable guide to the business. But it's safe to say we'd generally expect the share price to be lower as a result!

The image below shows how EPS has tracked over time (if you click on the image you can see greater detail).

Dive deeper into China Shengmu Organic Milk's key metrics by checking this interactive graph of China Shengmu Organic Milk's earnings, revenue and cash flow.

A Different Perspective

While the broader market gained around 18% in the last year, China Shengmu Organic Milk shareholders lost 42% (even including dividends). However, keep in mind that even the best stocks will sometimes underperform the market over a twelve month period. Unfortunately, last year's performance may indicate unresolved challenges, given that it was worse than the annualised loss of 6% over the last half decade. We realise that Baron Rothschild has said investors should "buy when there is blood on the streets", but we caution that investors should first be sure they are buying a high quality business. While it is well worth considering the different impacts that market conditions can have on the share price, there are other factors that are even more important. To that end, you should be aware of the 1 warning sign we've spotted with China Shengmu Organic Milk .

If you like to buy stocks alongside management, then you might just love this free list of companies. (Hint: many of them are unnoticed AND have attractive valuation).

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

Have feedback on this article? Concerned about the content? Get in touch with us directly. Alternatively, email editorial-team (at) simplywallst.com.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.