Despite some fund closures, the exchange traded fund (ETF) industry managed to continue expanding through the month of September.

ETF and exchange traded note (ETN) assets surpassed $900 billion in September, a brand-new record. There are also more funds out there than ever: the month closed with 1,066 products. [September ETF Performance Report.]

Emerging market funds also had a standout month. Olivier Ludwig for Index Universe notes that Vanguard MSCI Emerging Markets (NYSEArca: VWO) has been the most successful ETF year-to-date, gathering $13.3 billion in assets since the start of the year. [ETF Assets Hit A Milestone.]

That brings VWO even closer to surpassing its rival, iShares MSCI Emerging Markets (NYSEArca: EEM). The inflows are indicative of the improved sentiment toward developing markets as established economies limp their way toward recovery. [7 Top ETFs in the Third Quarter.]

SPDR Gold Trust (NYSEArca: GLD) is the second-most popular ETF, reflecting the intense market interest in all things gold-related. [Gold ETFs Look for Next Move.]

Tisha Guerrero contributed to this article.

The opinions and forecasts expressed herein are solely those of Tom Lydon, and may not actually come to pass. Information on this site should not be used or construed as an offer to sell, a solicitation of an offer to buy, or a recommendation for any product.