Looking today at week-over-week shares outstanding changes among the universe of ETFs covered at ETF Channel, one standout is the iShares U.S. Preferred Stock ETF ( PFF) where we have detected an approximate $76.6 million dollar outflow -- that's a 0.6% decrease week over week (from 337,250,000 to 335,300,000). Among the largest underlying components of PFF, in trading today Royal Bank of Scotland Group plc ( RBS) is up about 0.7%, Southwestern Energy Company ( SWN) is off about 0.3%, and Royal Bank of Scotland Group plc ( RBS) is higher by about 0.7%. For a complete list of holdings, visit the PFF Holdings page »The chart below shows the one year price performance of PFF, versus its 200 day moving average: Looking at the chart above, PFF's low point in its 52 week range is $38.98 per share, with $40.17 as the 52 week high point — that compares with a last trade of $39.30. 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 ».