Thanks Ed and good morning everyone. Before I begin, I want to remind everyone that unless specifically noted, my comments relate to third quarter 2018 as compared to third quarter 2017 and are based on our non-GAAP adjusted results. We report another quarter of solid financial results. In summary, our net revenue was up nominally with net transaction fees down 3% and non-transaction revenue up 5%. Adjusted operating expenses declined 3%, adjusted operating income of $171 million grew 2%. And finally, our adjusted diluted earnings per share grew 19% to $1.6. It’s worth noting that these results were achieved despite a decline in volumes in our proprietary products reflecting our more diversified mix of revenue. The press release we issued this morning and our slide deck provide the key operating metrics on volume and revenue capture for each of our segments as well as an overview of key revenue variances. I'd like to briefly highlight some of the key drivers influencing our performance in each segment. In our options segment 2% or $2.5 million increase in net revenue was primarily driven by increases of $3.4 million in net transaction fees from our multi-listed options and $2.4 million in access fees offset somewhat by $4.9 million decline in net transaction fees from index options. Index options average daily volume decreased 14% for the quarter reflecting a 47% decline in fixed options of offset somewhat by a 12% increase in SPX options. However, as Ed mentioned, Index options volume improved month over month throughout the quarter in both VIX and SPX. The impact of a decline in index options ADV was offset somewhat by a 10% increase in RPC resulting from a shift in the mix with SPX options accounting for a higher percentage of volume as well as pricing changes implemented at the beginning of the year. The 6% ADV increase in our multi-listed options business was primarily driven by higher industry volumes. Our market share was down from last year’s third quarter as we continued to focus on optimizing our overall net transaction fees reflected in an 11% increase in RPC for multi-listed options for the quarter. Turning to futures, the decline in net revenue resulted from a 28% decrease in ADV and a 3% decline in RPC, offset also somewhat by growth in non-transaction revenue. RPC was lower year-over-year due to a shift in the volume mix with fewer block trades which have a higher revenue capture. However, third quarter RPC was up 4% compared to the second quarter, reflecting the impact of fee changes implemented on August 1, as well as a more favorable overall mix. VIX futures volume picked up in the second half of the third quarter and surged in October as volatility heightened setting a monthly volume record for October. VIX futures had ADV of 420,000 contracts in October up 79% versus the third quarter and 58% above October of last year. Turning to U.S. Equities net revenue grew 2% primarily driven by increases in net transaction fees and exchange services and other fees. As we expected, SIP market data revenue fell 12% and proprietary market data increased 27%. As an industry los cost provider we plan to continue our focus on efforts on growing our proprietary market data by attracting new customers and innovating to meet client needs. We continue to expect downward pressure on SIP market data revenue, apps and auto recoveries due to initial consolidation and historical trends. Net revenue for European equities increased 21% on the U.S. dollar basis and up 22% on a local currency basis reflecting growth in both net transaction and non-transaction revenues. Debt transaction fees were the key growth driver reflecting favorable net capture and higher market share on relatively flat market volumes. The higher capture resulted from strong periodic auctions volume and LIS volumes which have higher relative net captures as well as price changes implemented January 1, this year. Net revenue for Global FX grew 20% this quarter as we maintained our strong market share at 14.8%, up nearly 2 percentage points year-over-year. The growth reflects favorable market volumes, stronger market share, and a disciplined pricing schedule. Turning to expenses, total adjusted operating expenses were $99 million for the quarter down 3% compared with last year’s third quarter. The key expense variances or one lower depreciation and amortization primarily result of the accelerated pace recognized in 2017 and the retirement of certain assets in 2018 and two, lower travel and promotional expenses due to target reduction and advertising related expenses. We are reconfirming our full-year expense guidance to be in the range of $420 million to $428 million. While we expect to be at the lower end of that range, it will depend on fourth quarter volume levels as about a third of our compensation and benefits expense is variable and will suffer just based on our financial performance and other metrics. For the third quarter we realized $5 million in pretax expense synergies primarily from compensation and benefits bringing year-to-date expense synergies to $12.2 million. Turning to income taxes our effective tax rate on adjusted earnings for the quarter was approximately 26% slightly below the low end of our annual guidance range of 26.5% to 28.5%. The effective tax rate on adjusted earnings in the third quarter of 2017 was about 36%. The decline primarily reflects the favourable impact of corporate tax reform. We are reaffirming we expect the annual effective tax rate on adjusted earnings to be within our guidance range of 26.5% to 28.5% for the year with the tax rate for the fourth quarter expected to be at the higher end of that range. In addition, we are reaffirming our guidance for CapEx of $35 million to $40 million and for depreciation and amortization of $43 million to $48 million. Moving to capital allocation, our strong financial results, cash flow generation and financial position enabled us to continue to invest in the growth of our business while also returning capital to the shareholders. We returned nearly $84 million to shareholders this quarter to nearly $49 million of share repurchases of our common stock and $35 million of dividends. Year-to-date through September we have repurchased approximately $1.3 million shares of Cboe common stock under our share repurchase program for nearly $141 million representing 1% of shares outstanding. We ended the quarter with adjusted cash and investments of $138 million and our leverage ratio was unchanged from last quarter at 1.6 times. In summary, Cboe delivered solid quarterly results and continued to demonstrate our focus on growing proprietary index products, expanding into new asset class by launching the first broad-based U.S. corporate bond index futures, growth in a diverse set of revenue streams, disciplined expense management, leveraging the scale of our business producing higher profit margins and integration plans that continue to be on track and ongoing focus on capital allocation by continuing to return capital to shareholders to quarterly dividends and share repurchases. We look forward to sharing our fourth quarter results in our outlook for 2019 on our fourth quarter earnings call in February. With that, I will turn the call over to Debbie for instructions on the Q&A portion of the call.