As you saw in the article on August 3rd, we provided you with an update of the monthly ETF Industry Association (etf-ia.com) report.  Each month they publish a report summarizing trends in the exchange traded industry regarding assets under management (AUM) and net cash flow, among other things. You can be added to their email list to receive the monthly newsletter, by clicking here. You are also able to export this data to Excel, or subscribe to access even more extensive stats. In the recent July update, ETFIA reported that "Assets in US listed Exchange Traded Funds (ETF) and Exchange Traded Notes (ETN) totaled approximately $1.21 trillion at July 2012 month-end, an increase of 9% over July 2011 month-end, when assets totaled $1.11 trillion" and "Equities led all categories for July with $17.1 billion in net inflows." After sifting through the data once more, we wanted to provide you with some quick, handy stats:

• Out of the 1468 ETFs in the ETF IA report, the median ETF reported $39 million in net assets.
• In the recent report, we found that the top 10 ETFs control roughly 35% of total ETF assets, which equates to over $426.782 billion of the $1.2 trillion in ETF assets.
• The top 20 largest ETFs control 47% of the total ETF assets
• The top 100 largest ETFs control nearly 80% of total ETF assets
• Only 11% of all ETFs have assets of at least $1 billion
• 72% of all ETF assets are in Equity-based funds while nearly 20% are in Fixed Income/Currency based funds
• Vanguard MSCI Emerging Markets ETF (VWO) has experienced the largest Net Cash Flow ($mil) for the year, up $8.952 billion, while the two most popular Corporate Bond ETFs, iShares iBox Investment Grade Corp Bond (LQD) and iShares iBoxx High Yield Corp Bond (HYG), are in second and third place for most net cash flow, pulling a combined $9.903 billion thru July 30th, 2012.