NEW YORK ( TheStreet) -- Shares of Altra Holdings Incorporated (Nasdaq: AIMC) were gapping down Monday morning with an open price 15.2% lower than Friday's closing price. The stock closed at $18.34 Friday and opened today's trading at $15.55. The average volume for Altra has been 178,500 shares per day over the past 30 days. Altra has a market cap of $530 million and is part of the industrial goods sector and industrial industry. Shares are down 7.7% year to date as of the close of trading on Friday. Altra Holdings, Inc., through its subsidiary, Altra Industrial Motion, Inc., designs, produces, and markets a range of mechanical power transmission and motion control products worldwide. The company has a P/E ratio of 17.9, above the average industrial industry P/E ratio of 17.8 and above the S&P 500 P/E ratio of 17.7. TheStreet Ratings rates Altra as a hold. The company's strengths can be seen in multiple areas, such as its impressive record of earnings per share growth, compelling growth in net income and robust revenue growth. However, as a counter to these strengths, we also find weaknesses including poor profit margins, weak operating cash flow and generally poor debt management. You can view the full Altra Ratings Report. Get more investment ideas from our investment research center. Interested in other stocks that are gapping down? Get free SMS text alerts sent to you when the action happens by texting DOWN to 95370 or select from multiple alert options.