The exchange traded funds with the highest dollar volume traded in a tight range the past month. SPDR S&P 500 (SPY), which has $176.98 billion in assets and averages $110.5 million in trading volume a day, is within 1% of its all-time high. It’s climbed 2.03% in the past month and is up 2.18% year to date, according to Morningstar Inc. The stock-market-tracking ETF’s largest holding is Apple (AAPL), which takes up nearly 4% of assets.