Looking today at week-over-week shares outstanding changes among the universe of ETFs covered at ETF Channel, one standout is the iShares Nasdaq Biotechnology ETF (IBB) where we have detected an approximate $50.2 million dollar outflow -- that's a 1.3% decrease week over week (from 19,550,000 to 19,300,000). Among the largest underlying components of IBB, in trading today Celgene Corp. (CELG) is up about 1.5%, Biogen Idec Inc (BIIB) is up about 1.5%, and Regeneron Pharmaceuticals, Inc. (REGN) is higher by about 3.8%. For a complete list of holdings, visit the IBB Holdings page »
Three Months Free, a $100 Value, Just Submit Your Top Stock Pick! (Offer ends 11/10/2013) Exchange traded funds (ETFs) trade just like stocks, but instead of ''shares'' investors are actually buying and selling ''units''. These ''units'' can be traded back and forth just like stocks, but can also be created or destroyed to accommodate investor demand. Each week we monitor the week-over-week change in shares outstanding data, to keep a lookout for those ETFs experiencing notable inflows (many new units created) or outflows (many old units destroyed). Creation of new units will mean the underlying holdings of the ETF need to be purchased, while destruction of units involves selling underlying holdings, so large flows can also impact the individual components held within ETFs.