Icoria ( ICOR) fell 20.1% after the company said it would be delisted from the Nasdaq SmallCap market on June 30 for failing to meet or exceed Nasdaq's minimum $1 bid price requirement for 180 calendar days. "We have anticipated this decision by the Nasdaq and our board of directors has decided not to appeal or consider options such as a reverse stock split," the company said. Shares of the biotechnology company traded down 6 cents to 23 cents. Shares of Pfizer ( PFE) rose modestly after the company said that it would buy up to $5 billion in stock. The company, which recently completed a $5 billion repurchase plan, said the new buyback plan "capitalizes on Pfizer's financial and operational strength to increase shareholder value." Shares traded up 11 cents to $28.90. Other health care volume movers included Merck ( MRK), down 73 cents to $31.25; Schering-Plough ( SGP), up 22 cents to $20.35; Johnson & Johnson ( JNJ), down 65 cents to $65.34; Elan ( ELN), down 25 cents to $6.68; Amgen ( AMGN), down 12 cents to $60.76; Millennium Pharmaceuticals ( MLNM), down 7 cents to $9.09; Momenta Pharmaceuticals ( MNTA), up $2.82 to $19.50; Guidant ( GDT), down 55 cents to $68.60; and Bristol-Myers Squibb ( BMY), down 15 cents to $25.50.