Looking at the universe of stocks we cover at Dividend Channel, on 5/13/13, BlackRock Build America Bond Trust ( BBN) will trade ex-dividend, for its monthly dividend of $0.1318, payable on 5/31/13. As a percentage of BBN's recent stock price of $23.01, this dividend works out to approximately 0.57%, so look for shares of BlackRock Build America Bond Trust to trade 0.57% lower — all else being equal — when BBN shares open for trading on 5/13/13.Below is a dividend history chart for BBN, showing historical dividends prior to the most recent $0.1318 declared by BlackRock Build America Bond Trust: In general, dividends are not always predictable; but looking at the history above can help in judging whether the most recent dividend from BBN is likely to continue, and whether the current estimated yield of 6.87% on annualized basis is a reasonable expectation of annual yield going forward. The chart below shows the one year performance of BBN shares, versus its 200 day moving average: Looking at the chart above, BBN's low point in its 52 week range is $21.66 per share, with $24.17 as the 52 week high point — that compares with a last trade of $23.01. According to the ETF Finder at ETF Channel, BBN makes up 1.69% of the CEF Income Composite Portfolio ETF ( PCEF) which is trading relatively unchanged on the day Thursday. In Thursday trading, BlackRock Build America Bond Trust shares are currently down about 0.1% on the day.