It hasn’t been a great month for the S&P/ASX 200 (Index: ^AXJO) (ASX: XJO). In the last 30 days the index has plunged around 6% and into negative territory for the year. Unfortunately for shareholders of some of the most popular growth shares on the ASX, this period of time has been even worse.

But could this mean there are bargain buys awaiting investors now?

I think there could well be. Here are four shares which could be worth a closer look.

Aconex Ltd (ASX: ACX)

In the last 30 days the software-as-a-service provider’s share price has plummeted by around 24%. Perhaps most surprising is the fact that the decline occurred, despite the company quadrupling its full year net profit. I believe this sell off has created a great opportunity for investors to pick up shares at a reasonable price. I’m not alone in this view either. As I’ve mentioned previously, its shares are currently trading at $5.95, significantly lower than investment bank Citi’s price target of $8.91.

Bellamy’s Australia Ltd (ASX: BAL)

Bellamy’s is yet another company that has suffered a sharp decline, despite posting an impressive full year result which saw the organic infant formula producer almost double sales and grow net profit after tax by 322% to $38.3 million. In addition to this I was very impressed with its margin improvement. Bellamy’s earnings before interest and tax margin increased year on year from 9.8% to 22.2%. With its shares priced at around 18x estimated FY 2017 earnings, I believe they could prove to be incredible value.

Blackmores Limited (ASX: BKL)

Blackmores’ share price is down 28% in the last 30 days thanks largely to investor concerns over changes to Chinese import regulations. With China in-country sales growing 536% to $48 million in FY 2016, it’s clear to see why investors would be fearful of the door being closed on the company. But management has dismissed these concerns and instead believes the evolving regulations represent an opportunity for the company to expand in the China market. Thanks to its strong growth prospects and relatively cheap price, I feel Blackmores could be a great investment.

Catapult Group International Ltd (ASX: CAT)

In the last month the share price of Catapult has dropped 16% to $3.34. The drop doesn’t come as huge surprise considering the sports analytics company recently completed an institutional placement at $3 per share in order to acquire US-based XOS Technologies and Ireland’s PLAYERTEK. But with these acquisitions expected to generate significant synergies and accelerate Catapult’s transition to positive EBITDA and free cash flow in FY 2017, this short term pain may be worth it for the long-term gain. I believe Catapult is starting to look attractive once again at the current share price.

Finally, before making an investment in either of these shares I would highly recommend you take a look to see if you own these three wealth destroying ASX shares. Each could be harming your portfolio right now and might be better off swapped out if you ask me.

3 Rotten Shares to Sell, and 1 to Buy Today

After a double-digit rally for the ASX since 2016 lows, investors should be on high alert. You'll find a full rundown below of 3 shares we think you should avoid today plus one top pick worth buying, even if the market turns south and the RBA keeps rates at an "emergency low." Simply click here to uncover these stocks.

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Motley Fool contributor James Mickleboro has no position in any stocks mentioned. The Motley Fool Australia owns shares of Bellamy's Australia. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy. This article contains general investment advice only (under AFSL 400691). Authorised by Bruce Jackson.