ETF League Tables. Vanguard's ETF assets rose by $1 billion on Wednesday, Aug. 17. Outflows from 'SPY' pushed total ETF assets for SSgA lower on Tuesday, Aug. 16. SSgA saw the largest inflows of any ETF issuer on Monday, Aug. 15. The top five ETF issuers all saw net inflows into their products on Friday, Aug. 12. The top eight ETF issuers all saw net inflows into their products on Wednesday, Aug. 10.