State Street Global Advisors may be synonymous with SPDR S&P 500 (SPY). But the second-largest ETF provider in the U.S. has several other aces up its sleeve: a top-notch suite of sector and industry ETFs, a partnership with DoubleLine that’s all the buzz, and a robust pipeline that includes the new Quality Mix SPDRs. The company’s 145 U.S.-listed ETFs hold $434.74 billion in assets combined.