On a trading day that saw the S&P 500 gain 0.9%, the Health Care sector (XLV) showed little change.

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 2.5% over the last thirty trading days while the S&P 500 was down 0.4%.

Telik (TELK) was a major loser in the sector. Its price dropped 11.9% (-28 cents) to close at $2.08, as 163,938 shares moved. The stock traded between $2.03 and $2.63.

Increasing 8.6% (+$1.13) to close at $14.29, Amarin Corporation plc (AMRN) was a major gainer in the sector. Today, 18.6 million shares traded hands. The stock traded in a range of $14.21 to $15.40. Share price improved over the last three months, now up $2.97 (26.2%) from $11.32 on March 30, 2012.

Impax Laboratories (IPXL) rose 4.5% to close at $21.59, cross its 50-day moving average of $21.59 and 200-day moving average of $21.82. Aegerion Pharmaceuticals (AEGR) declined 1.6% to close at $14.75, moving below its 50-day moving average of $14.58 and 200-day moving average of $14.90.

Thermo Fisher (TMO) rose 2.7% to close at $50.89, approaching its 50-day moving average of $51.24. It has also moved closer to its 200-day moving average of $52.48. GlaxoSmithKline (GSK) fell 1.2% to close at $45.54, moving down to 1.1% above its 200-day moving average of $45.03.