NEW YORK ( TheStreet) -- Illumina (Nasdaq: ILMN) is trading at unusually high volume Thursday with 10.7 million shares changing hands. It is currently at four times its average daily volume and trading down $2.74 (-5%) at $52.42 as of 3:10 p.m. ET. Illumina has a market cap of $4.58 billion and is part of the health care sector and drugs industry. Shares are up 80.9% year to date as of the close of trading on Wednesday. Illumina, Inc. develops, manufactures, and markets integrated systems for the analysis of genetic variation and biological function. The company has a P/E ratio of 48.3, above the average drugs industry P/E ratio of 47.7 and above the S&P 500 P/E ratio of 17.7. TheStreet Ratings rates Illumina as a hold. The company's strengths can be seen in multiple areas, such as its good cash flow from operations, expanding profit margins and largely solid financial position with reasonable debt levels by most measures. However, as a counter to these strengths, we also find weaknesses including a generally disappointing performance in the stock itself and unimpressive growth in net income. You can view the full Illumina 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 falling on unusually high volume? Get free SMS text alerts sent to you when the action happens by texting HVDOWN to 95370 or select from multiple alert options.