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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 Aerospace & Defense ETF (Symbol: XAR) where we have detected an approximate $163.6 million dollar outflow -- that's a 7.3% decrease week over week (from 16,200,000 to 15,020,000). Among the largest underlying components of XAR, in trading today Archer Aviation Inc (Symbol: ACHR) is up about 1.2%, General Dynamics Corp (Symbol: GD) is down about 0.4%, and HEICO Corp (Symbol: HEI) is lower by about 0.2%. For a complete list of holdings, visit the XAR Holdings page » The chart below shows the one year price performance of XAR, versus its 200 day moving average:

Looking at the chart above, XAR's low point in its 52 week range is $108.32 per share, with $142.78 as the 52 week high point — that compares with a last trade of $139.05. 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 ».

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.

Also see:

Low Beta Stocks
ASC shares outstanding history
Institutional Holders of BKYI

The views and opinions expressed herein are the views and opinions of the author and do not necessarily reflect those of Nasdaq, Inc.