The S&P/ASX 200 (Index: ^AXJO) (ASX: XJO) has rebounded strongly today, reversing most of the losses endured over the last two days. Unfortunately, however, there are a number of shares that are still trading in the red, including these four…

ResMed Inc. (CHESS) (ASX: RMD) shares have been slammed 5.5% to trade at $7.45, although they did fall as low as $7.35 earlier. The company, which develops and manufactures products for the treatment of sleep apnea, announced its quarterly results to the market overnight which revealed a fall in gross margins. However, the shares could still be a good option for long-term investors to consider.

Bulletproof Group Ltd (ASX: BPF) shares have fallen 6.7% to 35 cents, despite the absence of any specific news regarding the company. Bulletproof’s shares have been stuck in a downwards spiral since they peaked at 56.5 cents early in February, although that decline could actually represent a great opportunity for investors to buy. In saying that, an investment in Bulletproof is risky and should only be considered by investors willing to take on that extra risk.

Shine Corporate Ltd (ASX: SHJ) shares have fallen 6.3%, even though shares of its rival Slater & Gordon Limited (ASX: SGH) have risen another 11.5%. The pair of listed law firms have come under enormous scrutiny in recent times following reviews of their accounting policies, with both companies delivering huge cuts in earnings guidance. At $1.19 per share (down from a 52-week high of $3.15), Shine Corporate still poses as a risky investment proposition.

Select Harvests Limited (ASX: SHV) is another company in the doldrums today, shedding 3.6%. The almond producer’s shares have come under pressure so far in 2016 due to falling almond prices, which are a result of greater rainfall in California – the world’s biggest almond-producing region. While the company’s shares are certainly worth a closer look, a bet on Select Harvests today is largely a bet on the direction of almond prices in the future.

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Motley Fool contributor Ryan Newman owns shares of BULLETPRF FPO. The Motley Fool Australia has no position in any of the stocks mentioned. 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.