Thanks, Chris. And thank you everyone for joining us today. Before I begin, I'd like to remind everyone that we have posted supplemental financial slides to our Investor Relations website to accompany today's presentation. As Tim and Chris both mentioned, we are extremely pleased with the market share gains we achieved in Q1. Advertisers spend on the platform increased 44% over the prior year period, which represented in our second highest quarterly growth rates since 2019. Such growth also represented a significant acceleration from full year 2021 levels where advertisers spend grew 29%. Marketers and their agencies are allocating more of their advertising budgets to our platform. And we are winning new customers at an accelerating rate, which makes us more bullish than ever that our solution is resonating with customers. Revenue growth for the quarter was in line with our expectations and adjusted EBITDA was slightly better than expected. As we indicated in March, growth across our percent of spent pricing model is far outpacing growth across fixed price. And we expect this trend to continue going forward. This is coming from both new and existing customers. Our easy-to-use self-serve software is driving increased adoption and more dollars are moving to our platform. While this mix shift between pricing models will impact revenue growth rates near term, we do expect the relationship between growth and advertiser spend and growth in revenue to improve as we move through the year and beyond. This afternoon, I will be discussing some of the highlights of our Q1 performance as well as some of the key financial and operational drivers during the quarter. And I will also be reviewing our current expectations for Q2 and the full year 2022. In terms of top-line metrics for the first quarter, as I said advertisers spent across our platform increased 44% over the prior year period, accelerating from 26% growth in Q4. Revenue was 42.6 million, an increase of 6% over the prior year period. And contribution ex TAC was 27.5 million, an increase of 3% over the prior year period. Advertisers spent on the platform in Q1 grew well in excess of the overall growth rates expected for the U.S. programmatic market. And as we previously indicated, we expect that trend to continue going forward. The lifetime value of a customer using our percentage spend pricing option is significantly greater than that of a fixed price customer, as percent of spent customers ramp spend more significantly over time and have higher retention rates. Increasing customer adoption of our percent of spent pricing option has always been our goal because we believe that better positions us for more consistent, predictable long-term value creation. During the quarter we saw solid growth in advertisers spend across all key digital channels as customers are increasingly using the full omni-channel capabilities of our platform. CTV continues to be a big driver of our growth and continues to represent our largest channel based on advertisers spend. Additionally, mobile, desktop, streaming audio and digital out of home all had strong increases in advertisers spend for the quarter. From a customer vertical perspective, during the quarter we saw broad base strength across all key customer verticals outside of automotive. With automotive continuing to be negatively impacted by supply chain issues. Advertisers spend increased 53% across all customer verticals excluding automotive, and 68% across three of our largest customer verticals, retail, healthcare and entertainment. Further investment in our sales, marketing and technology teams is also paying dividends as evidenced by the significant increase in the number of active customers. At the end of Q1, we had 327 active customers versus 266 in the prior year period, representing a net increase of 61 customers over the past 12 months, or an increase of 23% year-over-year. Sequentially, the number of active customers increased by 18 compared to Q4 exceeding our expectations and representing a quarter-over-quarter increase of 6%. One last point on revenue as it relates to geographic mix. As we mentioned in the past, virtually all of our revenue is generated in the United States. We have been intentional with this strategy and have little exposure to international advertising budgets at this time. We recognized that geopolitical and macro uncertainty is causing some concern over advertising spend in international markets but given our limited exposure to international markets, we believe we have minimal risks associated with these events. Turning now to operating expenses, non-GAAP operating expenses, which represent the difference between contribution ex TAC and adjusted EBITDA totaled 31.4 million in the quarter, representing a year-over-year increase of 44%. The year-over-year increase is primarily attributable to the planned investments we've made over the past 12 months across the organization to further accelerate growth in advertiser spend, and drive market share gains. Adjusted EBITDA for the quarter was negative 3.9 million slightly better than our expectations. For the quarter, our non-GAAP net loss which excludes stock-based compensation totaled negative 6.8 million and non-GAAP loss per diluted share of Class A common stock was negative $0.09 for the quarter. From a cash flow perspective, we generated 11.6 million of net cash from operating activities in Q1 and ended the quarter with $248 million in cash, or just over $4 per share outstanding as of March 31, 2022. We also ended the year with a modest amount of debt totaling 17.5 million and significant availability under our line of credit. We believe that our growth profile and healthy balance sheet positioned us extremely well to take advantage of the rapidly growing market opportunity in front of us. Before moving on to discussing our forward guidance, I'd like to briefly cover a couple of housekeeping items for modeling purposes. In terms of share counts, we ended the quarter with 14.1 million Class A common shares outstanding and 61.2 million total shares outstanding. By the end of 2022, we expect the Class A common share counts increase to approximately 15.2 million and total shares outstanding increased to approximately 62.2 million. The expected increases are primarily the result of vesting activity under our long-term incentive plan. With respect to stock-based compensation, we recorded 6.4 million of SBC in the first quarter and expect SBC to be approximately $8 million per quarter for the balance of 2022. And with that, I'll now turn to our guidance for Q2 and for the full year 2022. For the second quarter of 2022, we expect advertiser spend across our platform to continue to outpace expected market growth rates, with expected growth of at least 35%. We expect revenue in the range of 52.5 million to 55 million, which represents year-over-year growth of approximately 4% to 9% and adjusted EBITDA in the range of negative $3 million to $5 million, reflecting continuing investments in our growth initiatives. For the full year, we are reaffirming our previously issued guidance and expect advertiser spend across our platform to grow at least 35%, we expect revenue in the range of $260 million to $270 million, which represents year-over-year growth of approximately 16% to 20% and adjusted EBITDA in the range of $25 million to $35 million. As we indicated in March, we intend to continue investing in critical areas of our business in 2022 to further accelerate growth in advertiser spend across our platform. We believe these incremental investments although impacting EBITDA in the short-term will further accelerate our growth and market share gains going forward. Our goal is to deliver outside growth in advertiser spend on the platform for many years to come. And as percentage of spend is expected to be the main driver of such growth we believe our revenue and contribution ex TAC growth rates will significantly improve over time as such growth rates move closer to the overall growth in advertisers spend on the platform. In closing, we have the utmost confidence that we will achieve our long-term targets of at least 500 million in revenue, and 35% adjusted EBITDA margins by 2025, if not sooner. Our conviction is centered around how marketers and agencies are responding to our solution today, as evidenced by the acceleration in both advertiser spend and new customer wins that we are currently seeing across the platform. Our total addressable market is massive and we firmly believe our solution uniquely and effectively addresses many of the challenges that marketers are facing in today's dynamic digital landscape. That concludes our prepared remarks today. And with that, I will now turn it back over to the operator to open the lines to questions. Operator?