Looking today at week-over-week shares outstanding changes among the universe of ETFs covered at ETF Channel, one standout is the SPDR S&P Biotech ETF (Symbol: XBI). We have detected an approximate $319.8 million outflow — a 4.6% decrease week over week (from 64,300,000 to 61,350,000 shares outstanding).
Among the largest underlying components of XBI, in trading today:
– CRISPR Therapeutics AG (Symbol: CRSP) is down about 2.8%.
– Revolution Medicines Inc (Symbol: RVMD) is up about 6.1%.
– Insmed Inc (Symbol: INSM) has increased by about 0.8%.
For a complete list of holdings, visit the [XBI Holdings page »](#).
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### XBI Price Performance and Technical Overview
The chart below shows the one-year price performance of XBI, versus its 200-day moving average:
Looking at the chart above, XBI’s low point in its 52-week range is $66.66 per share, with $111.80 as the 52-week high point. This compares to a last trade price of $110.75.
Comparing the most recent share price to the 200-day moving average can also be a useful technical analysis technique — learn more about the [200-day moving average »](#).
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### Understanding ETF Units and Share Changes
Exchange-traded funds (ETFs) trade just like stocks, but instead of “shares,” investors are 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 ETFs experiencing notable inflows (many new units created) or outflows (many old units destroyed).
– **Creation of new units** means the underlying holdings of the ETF need to be purchased.
– **Destruction of units** involves selling underlying holdings.
Therefore, large flows can also impact the individual components held within ETFs.
Click here to find out which [9 other ETFs experienced notable outflows »](#).
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### Additional Resources
– Communications Services Dividend Stocks
– Top Ten Hedge Funds Holding DMBS
– TK Market Cap History
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*The views and opinions expressed herein are those of the author and do not necessarily reflect those of Nasdaq, Inc.*
https://www.nasdaq.com/articles/noteworthy-etf-outflows-xbi-crsp-rvmd-insm