From the folks at Trade Alert, LLC (www.trade-alert.com), an options trading service that I use on a regular basis to track large block trades across option exchanges:

US options markets notch second busiest week of the year! Over 138M contracts traded this week as the broad market pulled back 5% in two days and volatility spiked to levels not seen since early February before rebounding modestly on Friday. ETF and Index levels were double normal, with 60M contracts on ETF and 18M index contracts trading, while single stock option volume of 58M was nearly 20% above normal. Including this week, YTD option volume is 3.96 billion contracts – 22% above year-ago totals.