Thank you, Ryan, and thank you all for joining us this morning. Last night, we reported earnings per diluted share for the first quarter of $2.99. Pretax earnings of $260 million and after-tax earnings of $198 million resulting in pretax and after-tax margins of 6.3% and 4.8% respectively on a reported basis. These results demonstrate we can sustain the attractive margin position we built in 2018. While certainly not conclusive, our first quarter results validate our position that durable, financial and operational infrastructure improvement can and should allow us to sustain these margins all while we begin to grow the top line again. Our first quarter results represent a strong start to the year and a significant improvement over the $1.64 earnings per diluted share we reported in the first quarter of 2018. As you will recall, this time last year, we were just beginning to execute on our profit improvement plan, which had yet to manifest itself in earnings. While the year-over-year improvement in the first quarter is significant, for the remainder of our prepared remarks, we will largely compare our quarterly performance to our own expectations. Our strong first quarter operational performance and the trajectory of our profit improvement initiatives have allowed us to raise full-year guidance to a range of $10.50 to $11 of earnings per diluted share on a GAAP basis, an increase of $1.25 from the midpoint of our guidance issued in February. Highlighting our results for the quarter on a consolidated basis, premium revenue of nearly $4 billion was better than expected due to better marketplace membership retention, coupled with slower membership attrition during the quarter. As expected, premium revenue has decreased sequentially due to lower Medicaid membership as we transitioned out of New Mexico as of December 31st and exited out of all but two regions in Florida as previously announced. Our medical care ratio of 85.3% was favorable to our expectations as the result of favorable prior year reserve development but more importantly improvement in our claims payment integrity process, frontline utilization management, quality and risk adjustment effort and the repricing benefit of our newly re-contracted pharmacy agreement. Our first quarter 2019 performance was positively impacted by our continued focused on medical cost management and a stable trend environment. Taken together, these factors produced favorable prior-year development of nearly $55 million or approximately $0.65 per diluted share, which we did not forecast in our initial 2019 guidance. These trends have continued in 2019 and as such our 2019 medical cost baseline and the trend off of that baseline so far have proven to be conservatively stated. We managed to a G&A ratio of 7.3% which was better than our expectations. We continued to effectively manage our expenses in the quarter despite the headwinds associated with lower premium revenue. As a reminder, we typically see higher G&A expenses in the latter part of the year due to costs associated with our profit improvement initiatives, as well as sales and marketing expense for the Medicare and marketplace open enrollment. Combined, the favorable medical care ratio and G&A ratio enabled us to deliver an after-tax margin of 4.8%. Now I will comment on our first quarter trends by line of business. The Medicaid business achieved an 88.5% Medical Care ratio and an after-tax margin of 2.8% in the quarter squarely in the range of the target margins we have forecasted for this business. Let me provide some additional insight into the favorable performance of the Medicaid business. TANF and ABD performed better than expected. While expansions slightly underperformed our expectations in the quarter due to some plans specific dynamics, which we will comment on later. Medical cost trends in general remain well-managed. Specialty and pharmacy cost trends ran lower sequentially, and we retained more quality, incentive in other revenue withholds. Our Medicaid business is performing well, producing top-tier margins and well positioned to grow. Our Medicare business comprising our DSNP and MMP products also started the year strong, managing to a medical care ratio of 84.7%, we produced an after-tax margin of approximately 7.5%, outperforming our expectations. More specifically on Medicare, both product lines, DSNP and MMP produced favorable results. We continue to demonstrate excellence and managing high acuity members by providing access to high quality healthcare at a reasonable cost. This includes our market leading management of LTSS benefits which are embedded in our MMP product. We are beginning to see the results of our quality and risk adjustment efforts as our Medicare risk scores are becoming more commensurate with the acuity of this population and risk adjustment revenue has increased. This excellent start to the year gives us even more confidence in our 2020 bidding strategy, and the competitive pricing and enhanced benefits we need as we expand this business by a 150 new counties in 2020. Finally, our marketplace business continues to perform well. Recall that for the 2019 underwriting year, we took a conservative rating posture to maintain our attractive margin position. We now have a scaled and profitable business that we plan to grow in 2020 and beyond. First quarter marketplace performance had the following highlights. We ended the quarter with approximately 330,000 members, which was better than our original expectations. We are generating and continue to generate more accurate risk scores and as a result we will likely pay less into the risk pool than expected. Our medical care ratio was 62.2% which compares favorably year-over-year and sequentially. Texas continues to be our stronghold, while California and Washington have both improved significantly over both periods. And we again forecast a seasonality to this business and as profitability as front-loaded due to benefit in product design. In some and most notably our current marketplace performance trajectory and margin profile give us flexibility to pursue profitable 2020 growth. Now I will comment on the first quarter through the lens of our locally operated health plans. Our health plan portfolio has started the year strong. As for the quarter 13 of 15 plans are meeting or exceeding their target margins. Our operating model continues to pay dividends as we empower local health plans to drive frontline decision-making with strong support from centralized services and disciplined corporate oversight. A few comments on our health plans performance. California, Illinois, Michigan and Texas, four of our largest plans had very solid quarters. Florida was a significant out performer in the quarter as it effectively managed the transition of it's across regions. In Ohio, our Medicaid MCR increased by 300 basis points from the fourth quarter, primarily due to a shift in the Medicaid expansion risk pool and a newly carved in behavioral health benefit, both of which were not adequately rated. We expect both phenomena to soon be reflected in our rates. Washington experienced higher medical costs from the Medicaid line-of-business compared to the fourth quarter of 2018 as a direct result of the new members we gained in our successful re-procurement and the plan wide carve-in of the behavioral benefit. This cost pressure will abate as the new members and new benefit mature. Turning now to our balance sheet and capital structure. We delivered approximately $290 million of dividends to the parent company in the first quarter. We expect to obtain approximately $500 million of additional parent company dividends for the balance of the year, including the excess statutory surplus from Florida and New Mexico. We have continued to improve the balance sheet retiring additional debt. Approximately $78 million of face value of 2020 convertible notes remain outstanding, as we continue to reduce our exposure to these expensive in the money converts that negatively impact our share count. In summary, we are very pleased with our first quarter performance across all of our operating metrics, product lines and health plans, and with respect to capital management. Now I will address our updated and increased 2019 earnings guidance. We are increasing our earnings per share guidance to a range of $10.50 to $11 with a midpoint of $10.75. This midpoint increase of $1.25 or more than 13% represents a solid $0.80 out performance for the quarter and a $0.45 raise for the remainder of the year. The $0.80 earnings per share first quarter out performance comprise $0.65 of favorable prior year reserve development, which we do not forecast as a matter of practice. And $0.15 of first quarter performance above our original first quarter forecast. The $0.45 raised for the balance of the year is backed by the momentum we have in all of our product lines as we project to exceed all of our previous guidance after-tax margin targets. I will now provide a quick update on the initiatives we are executing in 2019 for 2020 top-line growth. As a side note, we will spend more time on this topic at our upcoming Investor Day on May 30th. We have filed to expand our DSNP footprint in approximately 150 new counties for 2020. We are currently executing our 2020 marketplace pricing strategy and remain committed to measured growth ensuring that overall profit dollars grow even if that means lower overall marketplace margins. We are actively preparing for the Kentucky Medicaid RFP with resources deployed locally/ We have our certificate of authority and are building a network. We continue to expect incremental membership growth in our Illinois and Mississippi health plans in 2020, and we continue to have confidence in successful Texas Star Plus and STAR CHIP Awards in the coming months. Our successful margin recovery efforts have enabled us to focus additional effort on growth opportunities. We continue to evaluate new opportunities through state procurements, acquisitions of small health plans, benefit carve-ins and adjacent product expansion in our existing geographies. Let me briefly highlight what we plan to present for a week from now. We will provide you with a granular and detailed view of our top-line growth strategy, along with details of what we will sell, to whom and where in each of our product lines. We will provide you with our outlook for long-term revenue after tax margins and earnings per share. And you will hear from our executive leadership team about our ability to sustain our attractive margin position, our tactical approach to top-line growth initiatives, our robust capital allocation model, and other topics that support our continual drive to create shareholder value. In conclusion, we are very pleased with our first quarter results and our strong start to the year. Margin sustainability, the second part of our three-part plan is off to a good start. We have already launched the phase three, the top-line revenue growth phase and we are excited for what awaits us for the remainder of 2019 and beyond. I look forward to sharing more about our future growth plans and longer-term strategy at our upcoming Investor Day on May 30th in New York City. With that I will turn the call over to Tom Tran for more detail on the financials. Tom?