Thank you, Mark, and good evening, everyone. We delivered strong financial results in each quarter of 2023, with most core metrics exceeding our expectations for the full year. We delivered on our commitment for insurance company adjusted EBITDA profitability in 2023 and have a clear line of sight into achieving total company adjusted EBITDA profitability this year. I will touch on a few fourth-quarter highlights before shifting to our full-year performance. We had a strong close to 2023. Our fourth-quarter medical loss ratio significantly improved by 520 basis points to 86.4%, and our fourth-quarter total company adjusted EBITDA loss was $112 million, a $78 million year-over-year improvement. We ended the year with approximately one million members. Membership increased 5% quarter-over-quarter, driven by higher retention due to lower lapse rates and increased special enrolment additions. Turning to the full year; direct and assumed policy premiums were approximately $6.6 billion, a 3% decrease year-over-year, and modestly above the high end of our guidance range. This was driven by lower membership, partially offset by rate increases. The full-year medical loss ratio was 81.6%, a 370 basis point year-over-year improvement and below the low end of our guidance range. Overall utilization trends were modestly favourable relative to our expectations for the full year, and we delivered medical cost savings through our total cost-of-care initiatives. As Mark mentioned, utilization trends within specific service categories remained consistent throughout the year. On risk adjustment, our risk transfer as a percentage of direct and assumed policy premiums for 2023 was lower year-over-year at approximately 14% due to our member profiles having shifted closer to the overall ACA population. The December weekly report resulted in only modest updates to our risk transfer estimates. Switching to administrative costs; the 2023 insurance company administrative expense ratio improved 270 basis points year-over-year to 17.9%, driven by distribution optimization and lower risk transfer per member as a percent of premiums compared to the prior year. Partially offsetting these positive developments was a $29 million provision for credit losses on risk-sharing receivables, which mainly impacted the fourth quarter. This relates to a small number of provider risk deals, which have since been terminated. The 2023 insurance company combined ratio significantly improved by approximately 640 basis points year-over-year to 99.5%, driven by both an improved MLR and administrative cost efficiencies. In 2023, we achieved insurance company adjusted EBITDA of $169 million, representing a $450 million year-over-year improvement, and that was above the high end of our guidance range. Our adjusted administrative expense ratio improved 350 basis points year-over-year to 21% for the full year, in line with our expectations. The lower adjusted administrative expense ratio was driven by the same factors that impacted the insurance company administrative ratio, as well as higher net investment income. We have made significant progress on improving our profitability. Our full year total company adjusted EBITDA was a loss of $45 million, a substantial $417 million year-over-year improvement, and better than the high end of our guidance range. Over the past two years, adjusted EBITDA as a percentage of premiums before seeded reinsurance has improved by approximately 15 points. Shifting to the balance sheet, our capital position remains very strong. We ended the year with $2.9 billion of cash investments, including $234 million of cash and investments at the parent. As of December 31, 2023, our insurance subsidiaries had approximately $800 million of capital and surplus, including $248 million of excess capital driven by our strong operating performance. As a reminder, the higher capital requirements for new carriers in Florida, our largest state, expired for us at the start of this year. As of January 01, 2024, we expect a lower capital ratio requirement to generate an additional $140 million of excess capital in our insurance subsidiaries. Given the excess capital in our insurance subsidiaries, funding of our 2024 growth capital requirements will have minimal impact on parent cash. With respect to quota share reinsurance, in 2024, we expect to increase our seeding percentage from around 45% of premiums before seeded reinsurance to the low 50% range. Before I turn to the 2024 outlook, I want to discuss a new financial reporting structure that we will roll out beginning with our first quarter 2024 results. In order to increase transparency and improve comparability, we will be revising our presentation of the income statement to more closely align with our peers and our discussion of financial results and guidance will focus on the performance of the total company. For 2024, we will provide guidance for total revenue, medical loss ratio, SG&A expense ratio and total company adjusted EVDA. In today's earnings release, we included supplemental information on the 2024 financial outlook, including full year 2023 results for these measures, as well as details on the components of the metrics and calculations. Turning now to the 2024 full year guidance, we expect to build on the strong momentum in 2023 and achieve total company adjusted EBITDA profitability in 2024. We expect total revenues in the range of $8.3 billion to $8.4 billion based on strong retention, above-market growth during the 2024 open enrolment period, and SEP member additions throughout the year as Medicaid redeterminations continue. On Medicaid redeterminations, our 2024 guidance contemplates strong SEP additions and assumes higher acuity and partial year risk adjustment dynamics for these members. We are pleased with our strong open enrolment growth and expect it to result in overall a healthier membership profile. We expect our medical loss ratio to be in the range of 80.2% to 81.2%, representing a 90 basis point improvement year-over-year at the midpoint. For 2024, we price for medical cost trends and expect MLR improvements to be driven by our total cost of care initiatives, including PBM savings. We expect our quarterly MLR seasonality to be similar to 2023, although with a steeper slope. For 2024, we expect a higher risk transfer as a percentage of premiums as compared to 2023, based on our updated membership mix. As the new policy year business matures, our overall per member claims levels may change with corresponding impacts on our estimate for risk transfer. Such changes impact the numerator and denominator of our MLR, but we would not expect them to have an impact on our per member underwriting economics. We expect our SG&A expense ratio to be in the range of 20.5% to 21%, representing a 350 basis point year-over-year improvement at the midpoint. This ratio includes stock-based compensation expense, which in 2023 was approximately $160 million and included a one-time charge of $46 million related to accelerated stock-based compensation expense recognized as a result of the cancellation of the Founders' Awards. We expect our SG&A expense ratio to be fairly consistent in the first three quarters, with a modest uptick in the fourth quarter. We expect total company adjusted EBITDA to be in the range of $125 million to $175 million, representing an almost $200 million year-over-year improvement at the midpoint. In closing, 2023 was a pivotal year for Oscar. We delivered on our commitments for insurance company adjusted EBITDA profitability, and we are well positioned to return to growth and achieve total company adjusted EBITDA profitability this year. And with that, let me turn the call back over to Mark for closing remarks.