NEW YORK ( TheStreet) -- ResMed (NYSE: RMD) is trading at unusually high volume Thursday with 3.7 million shares changing hands. It is currently at four times its average daily volume and trading up $1.40 (+4.3%) at $33.55 as of 11:27 a.m. ET. ResMed has a market cap of $4.6 billion and is part of the health care sector and health services industry. Shares are down 12.4% year to date as of the close of trading on Wednesday. ResMed Inc., through its subsidiaries, engages in the development, manufacture, and distribution of medical equipment for treating, diagnosing, and managing sleep-disordered breathing and other respiratory disorders. The company has a P/E ratio of 21.7, above the average health services industry P/E ratio of 21.5 and above the S&P 500 P/E ratio of 17.7. TheStreet Ratings rates ResMed as a buy. The company's strengths can be seen in multiple areas, such as its revenue growth, largely solid financial position with reasonable debt levels by most measures, growth in earnings per share, good cash flow from operations and expanding profit margins. We feel these strengths outweigh the fact that the company has had somewhat disappointing return on equity. You can view the full ResMed Ratings Report. See all heavy volume stocks in our stocks moving on unusual volume list or get investment ideas from our investment research center. Interested in other stocks that are rising on unusually high volume? Get free SMS text alerts sent to you when the action happens by texting HVUP to 95370 or select from multiple alert options.