During trading today, the Health Care sector (XLV) showed little change while the S&P 500 fell 0.3%.

While being down today, the ETF, as a proxy for sector performance, tracked closer to the overall market today than over the past month. Entering today's trading, XLV was up 2.7% over the last thirty trading days while the S&P 500 was down 0.8%.

Anthera Pharmaceuticals (ANTH) fell 70.7% to close at 81 cents, crossing its 50-day moving average of $2.22. Meanwhile, Universal Health Services (UHS) climbed 8.5% to close at $42.60, moving past its 200-day moving average of $40.60.

WellCare Health Plans (WCG) rose 8.8% to close at $53.98, approaching its 50-day moving average of $54.69. It has also moved closer to its 200-day moving average of $59.63. Amedisys (SNTA) fell 9.1% to close at $11.88, moving closer to its 50-day moving average of $11.78. Also, the stock moved closer to its 200-day moving average of $4.68.

HMS Holdings (HMSY) was a major gainer in the sector, rising 14.2% (+$3.96) to close at $31.75 with 6.1 million shares moving. The stock traded in a range of $27.41 to $34.20. Shares are up over the last two months, having risen $7.36 (30.2%) from a price of $24.39 on May 1, 2012.

Arena Pharmaceuticals (ARNA) was one of the sector's big losers, as its price dropped 10.2% (-$1.16) to close at $10.23. 53.3 million shares of the stock moved. The stock traded between $9.81 and $11.40.

Community Health Systems (CYH) hit a new 52-week high today, reaching $28.79 to top the previous high of $27.63.