If you own shares in A2 Milk Company Ltd(ASX: A2M), chances are...

If you own shares in A2 Milk Company Ltd(ASX: A2M), chances are you didn't have a fun time watching your brokerage account over the month of September.

During the month just gone, A2 Milk shares had a shocker, no way around it. The ASX dairy producer started September out at $4.55, after falling nearly 11% over August. By the end of last week, A2 Milk shares had closed at just $4.24 each.

That means that this embattled company lost another 6.8% over the month of September, as well as a disappointing 37.4% over 2023 to date. Ouch.

You can check all of that out below:

There's little doubt that investors lost a lot of confidence in the A2 Milk share price following the company's August full-year earnings.

As we covered at the time, these results showed A2 Milk report healthy numbers for the 2023 financial year. The company revealed a 10.1% rise in revenues to NZ$1.59 billion. As we’rell as an 11.8% rise in earnings before interest, tax, depreciation, and amortisation (EBITDA) to NZ$219.3 million.

That enabled A2 Milk to report a 26.9% surge in net profits after tax (NPAT) to NZ$155.6 million.

However, investors were not impressed, sending the A2 Milk share price down more than 13% on the day these earnings came out. As my Fool colleague James noted then, this was probably due to A2 Milk's weaker-than-expected guidance for the 2024 financial year.

The company told investors to expect "low single-digit revenue growth and an EBITDA margin broadly in line with FY 2023" over the current financial year.