NEW YORK ( TheStreet) -- Neutral Tandem (Nasdaq: TNDM) is trading at unusually high volume Monday with 1.5 million shares changing hands. It is currently at four times its average daily volume and trading down $3.16 (-18.6%) at $13.79 as of 12:37 p.m. ET. Neutral Tandem has a market cap of $547.1 million and is part of the technology sector and telecommunications industry. Shares are up 17.4% year to date as of the close of trading on Friday. Neutral Tandem, Inc., through its subsidiaries, provides tandem interconnection services principally to competitive carriers, including wireless, wireline, cable, and broadband telephony companies in the United States. The company has a P/E ratio of 15, equal to the average telecommunications industry P/E ratio and below the S&P 500 P/E ratio of 17.2. TheStreet Ratings rates Neutral Tandem as hold. 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 and expanding profit margins. However, as a counter to these strengths, we also find weaknesses including deteriorating net income, weak operating cash flow and disappointing return on equity. You can view the full Neutral Tandem 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.