Mid-tier membership

Market cap of mid-tier companies ($300M-$800M). Italics = New since September 1999 (see BioCentury, Sept. 7, 1999).

Company Mkt cap ($M)
Alexion (ALXN) 340.0
Alliance (ALLP)1 320.9
Amylin (AMLN)1 344.6
Aurora (ABSC) 450.8
Avigen (AVGN) 446.4
Axis-Shield (LSE:ADS) 339.2