During trading today, the Health Care sector (XLV) showed little change while the S&P 500 fell 0.5%.

Natural Alternatives International (NAII) was a major loser in the sector, falling 15% (-$1.05) to close at $5.94 with 354,392 shares moving. The stock traded in a range of $5.64 to $7.01.

Arena Pharmaceuticals (ARNA) was a major gainer in the sector, rising 13.3% (+$1.33) to close at $11.35 with 42.1 million shares moving. The stock traded in a range of $9.90 to $11.47.

Sagent Pharmaceuticals (SGNT) fell 5.8% to close at $16.92, crossing its 50-day moving average of $17.64. Meanwhile, MedCath Corporation (MDTH) climbed 4.8% to close at $7.85, moving past its 200-day moving average of $7.70.

Dr. Reddy's Laboratories (SNY) fell 3.7% to close at $29.81, moving closer to its 50-day moving average of $29.18. Also, the stock moved closer to its 200-day moving average of $36.29. Flamel Technologies (FLML) rose 9.1% to close at $5.05, getting closer to its 200-day moving average or $5.14.

OraSure Technologies (OSUR) hit a new 52-week high today, reaching $13.65 to top the previous high of $12.28.