Thank you, Ed, and good morning. Before I get into the details of our first quarter results, let me point out that our GAAP or reported first quarter 2017 results include Bats for the month of March. Therefore, the year-over-year variances on a GAAP basis were largely due to the addition of Bats on March 1. To provide a more meaningful review of our business, I will speak to the combined results of CBOE and Bats for the full quarter. So my remarks today will primarily focus on our pro forma non-GAAP results, which present financial results to reflect the Bats transaction, as if it had occurred on January 1, 2016. On that basis for the combined company, we saw strong results for the quarter despite weaker trading and activity across U.S. and European equities and derivatives markets overall. Our results were primarily fueled by the strength of our proprietary index products and growth in our non-transaction revenue which offset weaker trading activity in U.S. and European equities, and we're off to a strong start on our cost synergy targets. Summarizing our pro forma adjusted results, net revenue was $265.3 million, up 4% above last year's first quarter. Operating expenses were $106.3 million, up 4%, and the operating margin increased 10 basis points versus last year's first quarter. Diluted earnings per share of $0.86 was up 25% over the prior year period. Looking at our results further, starting with net revenue, we reported increases in transaction fees, exchange services and other fees, market data fees and other revenue. Generally, we saw a mixed performance by business segment with futures achieving the largest revenue increase followed by options. U.S. and European equities were relatively flat to down as those segments faced a more challenging trading environment this year and difficult comparisons against record results posted in last year's first quarter. However, strong growth in non-transaction revenue in these segments offset shortfalls in net transaction fees. I'll get into this in more detail later when I review each business segment. Non-transaction revenue accounted for 42.9% of total revenue in the first quarter of 2017, up 160 basis points from 41.3% in 2016's first quarter. As a result of the acquisition and related organizational changes, we are now reporting on five business segments: Options, U.S. Equities, Futures, European Equities and Global FX. Results for fiscal periods prior to first quarter 2017 are presented to conform to the new segments. Looking at the revenue contribution by segment, pro forma net revenue from options accounted for 51% of total net revenue and was up $2.9 million or 2% compared with the first quarter of 2016. The increase was primarily driven by higher revenue from net transaction fees, exchange services and other fees, market data fees and other revenue, offset somewhat by an increase in royalty fees versus last year's first quarter. Net transaction fees for options was up $1.5 million in the first quarter with higher revenue from index options, offset somewhat by a decline in multiply listed options. Transaction fees from our higher RPC index options were $85 million, up $5 million or 6%. This increase was due to a 7% increase in average daily volume over the last year's first quarter, led by a record quarterly average daily volume of $1.1 million contracts for SPX options, offset somewhat by a 2% decrease in revenue per contract. Transaction fees from multiply listed options of $18 million was down $4 million or 18%, reflecting a 9% increase in average daily volume, offset by a 27% decrease in revenue per contract, resulting from higher volume-related incentives achieved by trading participants. The increase in options market data fees was primarily due to gains in our share of U.S. options transactions this quarter compared to last year's first quarter. Total market share for CBOE Holdings was 41.4% for the first quarter of 2017, up from 36.8% in the first quarter of 2016. Furthermore, Bats BZX and Bats EDGX Exchanges achieved record market share of 11.5% for the quarter, up from 10.2% in last year's first quarter. Moving to Futures. Our fastest-growing and highest RPC business segment posted strong first quarter net revenue of $28.8 million, up 37%. This increase resulted from higher transaction fees driven by an 18%, an average daily volume per CFE, and a 10% increase in revenue per contract. Futures revenue per contract reached a new quarterly high of $1.81, up from $1.64 in last year's first quarter, reflecting the impact of fee changes implemented in January 2017. Looking at CBOE's organic growth from Options and Futures, excluding the Bats revenue contribution, you can see that we had strong organic growth of 8%, driven by the strength of our proprietary products, particularly VIX futures and SPX options. In the first quarter, proprietary products accounted for 88.9% of legacy CBOE's net transaction fees, up from 85.8% in the first quarter of 2016. On a pro forma basis, proprietary products accounted for 65.9% of net transaction fees in the first quarter of 2017, compared to 59.9% in the first quarter of 2016. Turning to U.S. Equities. Net operating revenue was essentially flat, reflecting a 21% decline in market volumes and a 2.1 percentage point decrease in market share, offset by a 21% increase in net capture, reflecting difficult comparisons against last year's record market share and trading activity. Generally, during periods of low volatility, such as we experienced in the first quarter of 2017, overall equities volumes decline and a higher percentage of shares are traded off-exchange. However, we were pleased that the strong contribution from our non-transaction revenue, including exchange services and other fees and market data fees, offset the decline in net transaction fees. Faced with a similar environment, net revenue for European equities declined 4%. However, the decrease was primarily due to the stronger dollar relative to the pound sterling. In local currency, net revenue grew 11% to £14.4 million in the first quarter of 2017, from £13 million in the first quarter of 2016, primarily due to growth in non-transaction revenue. Net transaction fees also increased, although to a lesser degree, despite a 15% decline in overall market average daily notional value and difficult market conditions, which was offset by an 18% increase in net revenue capture. For the first quarter of 2017, Bats retained its position as the largest European stock exchange with 21.5% market share. Net revenues for Global FX rose 4% to $10.8 million in the first quarter of 2017. This increase was due to access fees implemented in the third quarter of 2016. In addition, market share reached a new high of 12.9% for the first quarter. During the first quarter of 2017, nearly $29 billion of average daily notional value traded on the Hotspot FX platform, down slightly from just over $29 billion in last year's first quarter. Turning to expenses. This next slide details total adjusted pro forma operating expenses of $106.3 million for the quarter, up $3.7 million compared with last year's first quarter. Looking at the expenses in detail, you can see higher costs for compensation and benefits offset by lower costs for depreciation and amortization. The increase in compensation and benefits largely reflects higher incentive-based compensation which is aligned with our financial performance. Looking at our progress on cost synergies we expect to achieve from the Bats acquisition as we discussed previously, we expect to achieve $50 million in annualized expense synergies by year three and $65 million by year five. As Ed noted, we hit the ground running day 1. And while it's still in early days, we are making solid progress executing on our integration plans and as a result, the realization of synergies is ahead of plan. As this slide shows, we now expect to end the year with $20 million in GAAP run rate synergies for 2017, as we anticipate realizing some of the synergies earlier than previously expected, to arrive at the $50 million run rate in year three. For the first quarter, we realized $2.4 million pretax in expense synergies, primarily in compensation and benefits and professional services. On a cash basis, the run rate synergies for 2017 are about $5 million higher or $25 million, primarily reflecting lower expenditures for capitalized software. We think these targets are highly achievable and we'll update you as we make further progress in the integration process. Turning to guidance, the following information details our expectations for certain financial metrics for the full year 2017, taking into account our acquisition of Bats. Starting with expenses, we now expect total operating expenses to be in the range of $415 million to $423 million. This guidance excludes acquisition-related expenses, accelerated stock-based compensation and amortization of acquired intangible assets that will be included in our non-GAAP reconciliation. In 2016, CBOE and Bats combined had adjusted operating expenses of $417 million. So our 2017 guidance for operating expenses represents a change of up 1% to down 1%. Our guidance for 2017 primarily reflects higher expenses for compensation and benefits and lower depreciation and amortization expense. The increase in compensation and benefits primarily reflects merit increases, higher incentive-based compensation and a ramp-up in hiring to appropriately staff the maintenance and operations of our two trading platforms as well as to execute on the multiyear migration to the Bats technology platform. The decrease in depreciation and amortization is primarily due to the roll-off of fully depreciated assets. Depreciation and amortization expense which is included in our total expense guidance, is expected to be between $52 million to $54 million, excluding amortization of acquired intangible assets of about $169 million, which will be excluded from our non-GAAP results. On a combined basis, CBOE and Bats incurred G&A expenses of $57 million in 2016, excluding the amortization of acquired intangible assets. We expect our effective tax rate for 2017 to be in the range of 35% to 37%. For 2016, CBOE's effective tax rate was 39.4%, and Bats' was 39%. The effective tax rate outlook includes the adoption of new accounting guidance by CBOE in 2017 that requires the excess cash benefit or expense relating to the exercise of stock options and vesting on restricted stock to be reported in income tax expense versus through equity under previous guidance. This change in accounting guidance may have a favorable or unfavorable impact on our tax rate going forward, depending upon the future stock -- our future stock price and the concentration of stock awards vesting. Additionally, the tax rate reflects the benefit of recharacterizing our European operations from U.S. tax perspective. Moving on, capital spending in 2017 is expected to be between $55 million to $60 million, which includes spending to migrate the CBOE exchanges onto the proprietary Bats technology, while continuing to invest in systems to support CBOE's current trading technology. In 2016, CBOE's capital spending was $44 million and Bats' was $9 million. Let me touch on interest expense and debt. To fund the cash portion of the Bats acquisition as well as the repayment of Bats' existing indebtedness and certain transaction costs, we obtained borrowings of $1.65 billion, including a $1 billion, five-year term loan and a $655 million in 3.65% senior notes. The interest and fees for the senior notes are expected to result in interest expense of about $24.2 million for the full year 2017, a little over $6 million each quarter. The $1 billion term loan has an initial interest rate of 2.304% based on 3-month LIBOR plus 1.25% per annum. This rate is subject to change based on credit rating in a range from 1% to 1.75%. Before I wrap up, let me touch on our capital management objectives. First and foremost, we plan to continue to invest in the growth of our business, return capital through dividends and utilize excess cash to pay down the five-year term loan as quickly as possible. We ended the first quarter with cash of $153 million and a strong cash flow position that enabled us to reduce our debt by $150 million. While I do plan to continue to utilize cash to pay down debt, I wouldn't use the first quarter payment as a quarterly run rate since our cash needs vary from quarter-to-quarter. Our debt-to-EBITDA ratio based on trailing 12 months, adjusted pro forma EBITDA at quarter end was 2.4x, which is down from 2.6x on the date of the Bats acquisition. And while we don't have a specific leverage ratio target, we are managing to. We will look to continue to reduce our debt to enhance our balance sheet flexibility. While we are not currently active on our share repurchase program, we continue to take an opportunistic approach and may make opportunistic share repurchases, depending on the circumstances. To summarize, we're off to a strong start this year. Our first quarter results demonstrate the strength of our proprietary index products, generating strong organic growth; diversifying and stabilizing our revenue streams with our increased mix of non-transaction revenues; disciplined expense management, leveraging the scale of our business model, producing higher operating margins and an integration plan on track with a strong start to cost-synergy realization; ongoing focus on capital allocation, reducing debt by $150 million. Overall, we remain focused on positioning the company for long-term success by delivering profitable growth while managing costs effectively. We are well positioned to build on our strong foundation, and look forward to updating you on our progress. With that, we thank you for your time this morning. I will turn it back over to Debbie for instructions on the Q&A portion of our call.