The Health Care sector (XLV) held steady during a trading day that saw the S&P 500 grow 1.2%.

Although it went in the opposite direction of the market today, the ETF tracked closer to the overall market today than over the past month. Entering today's trading, XLV was down 2.6% over the last thirty trading days while the S&P 500 was down 4.8%.

Mannatech (MTEX) rose 34.3% to close at $4.50, cross its 50-day moving average of $4.35 and 200-day moving average of $3.15. Oncolytics Biotech (ONCY) declined 7.6% to close at $3.53, moving below its 50-day moving average of $3.76 and 200-day moving average of $4.17.

PSS World Medical (PSSI) rose 4% to close at $20.83, approaching its 50-day moving average of $22.12. It has also moved closer to its 200-day moving average of $23.40. Idenix Pharmaceuticals (IDIX) fell 2.8% to close at $9.41, moving down to 1% above its 200-day moving average of $9.32.

Santarus (SNTS) was a significant gainer in the sector, rising 13.5%. The stock closed at $6.80 with two million shares moving. The stock traded in a range of $6.21 to $6.88. Amarin Corporation plc (AMRN) was another big mover, climbing 72 cents (+6.2%) to a closing price of $12.27.

Complete Genomics (GNOM) was a major loser in the sector, falling 13% (-39 cents) to close at $2.61 with 6.8 million shares moving. The stock traded between $2.60 and $3.20.