NEW YORK (ETF Expert) -- There have been precious few opportunities to purchase U.S. stock weakness over the last seven months.Specifically, the smallest dips have reversed course quickly, always finding a way to grind higher. On the other hand, some exchange-traded vehicles along the more modest rung of the risk ladder have caught the attention of institutional buyers. Consider SPDR Barclays Convertible Securities ( CWB). This ETF seeks the price and yield performance of the Barclays U.S. Convertible Bond Index > $500M -- an index that tracks U.S. convertibles with issue sizes greater than $500 million. With a slight increase in Treasury bond yields pressuring income assets over the past few days, sellers have pushed the price of CWB lower. However, during last week, CWB witnessed $45 million flow into the fund for a 4% increase in assets under management. The trading occurred on nearly five times the average trading volume. At present, CWB delivers an approximate annual yield of 3.75%. It has also been adept at capital appreciation in 2013. Year-to-date, CWB's total return is roughly 8.25%. Since the November elections, CWB has rocketed higher alongside gains in broader U.S. equities. Technical analysts might be more impressed with the exchange-traded fund's ability to bounce higher on every minor pullback to a 50-day moving average.