Tech fund QQQ is the most profitable offering in the $11.7 trillion ETF industry, but Invesco earns virtually nothing from running it. Now the asset manager is asking shareholders to change that. Invesco filed a proxy statement with the SEC to convert it into an open-ended fund. On \\"Bloomberg ETF IQ,\\" Katie Greifeld and Scarlet Fu talk with State Street's Anna Paglia about the possibility of SPDR S&P 500 ETF Trust (ticker: SPY) following the same steps by QQQ.