Good afternoon and thank you for joining us for our year-end 2019 earnings conference call. Once again, Thomas is on the call, and will handle the Q&A, but asked me to present the rest of his comments. As a reminder, today's call may include forward-looking statements, which represents the company's belief regarding future events, which by their nature are not certain and are outside of the company's control, or actual results and financial condition may differ possibly materially from what is indicated in these forward-looking statements. We ask that you refer to the disclaimers in our press release. You should also review a description of risk factors contained in our financial reports filed with the SEC. Interactive Brokers again ended the year with record numbers with client equity up 35% to over $174 billion, double that of 2016. Accounts were 690,000, up 15%, and brokerage pre-tax margin was 65%. On the balance sheet side, margin loans rose to $31 billion, tying our previous record, while our total equity is now over $7.9 billion. Importantly, our net revenues adjusted for our usual non-core items of currency translation and treasury portfolio marks were up 1% to $503 million in the fourth quarter, despite events that people believed were likely to lead to a decrease in revenue, such as lower volatility, lower interest rates, and the introduction of zero commission. Despite the Federal Reserve lowering interest rates three times this year, our net interest income rose 18%. Commission revenue was $205 million, down 18%, which is to be expected in a quarter where average volatility, which has a big effect on how much our clients trade fell 33%. There are now two ways for clients to trade at Interactive Brokers, our IBKR Pro platform offers our full capabilities and technology with best price execution, and our extremely low commission and margin rates ranging from 1.85% to 3.05% based on loan size, or you can use IBKR Lite, which we introduced in September, where we offer clients zero commissions and low margin rates, currently 4.05%, but we let them know that we will route their orders to high frequency traders in return for payment. So far, we have about 5,600 Lite customers, 3,600 of whom switched from Pro, and about 10% have chosen to switch from Lite to Pro in the less than three months since the introduction of Lite. Because we tend to have a more sophisticated client base that is well aware of the benefits to performance of best price execution on orders, they have chosen to stay with IBKR Pro, and we have not seen a major impact on our business. We are very pleased that third-party information firm, IHS Markit analyzed U.S. stock executions and has once again shown Interactive Brokers execution advantage. We executed orders at $0.43 per round lot better, meaning cheaper than the industry average. That translates to major savings for our IBKR Pro customers, who experienced better performance by lowering their trading costs. For the calculation, we include all our market orders over 100 shares. We do not pick and choose data. We achieved this price improvement for IBKR Pro through our superior technology and our founding practice of never selling our customers' orders. Instead, we searched through many venues for the best available price, which is often hidden as traders do not want to reveal their buying or selling intentions. During our search, we constantly refresh accumulated statistical information about the likelihood of finding a better price for any specific stock at any specific venue. This software is expensive to develop and maintain, but it pays for itself in generating loyal customers who tend to trade more often, and accordingly benefit the most from superior executions. Our business is now primarily electronic brokerage, and in 2019 the Brokerage segment earned a record $1.2 billion in pre-tax profits, and achieved a 65% pre-tax margin. There is no other broker who comes close to our levels of profitability, and we achieved this while offering state-of-the-art technology, low margin rates, and high interest rates on customer cash. Because we are automated and can program for the different currencies, regulations, and requirements of other countries, Interactive Brokers has always been an international company. More than 60% of our accounts come from outside the Americas. Over the last year, while our accounts grew 15%, by country that growth was just over 6% in the U.S., 9.5% in China, and 23% everywhere else. So, everywhere else is a place where we see ourselves growing more in future. As the majority of our new customers come to us by recommendation of existing customers, the more we do to give our customers a successful experience, the more people who sign up as clients, and the more likely they will enthusiastically recommend our platform to others. This helps us achieve faster growth. The more new clients we onboard now, the more customers they will bring to us in the following weeks and months. Now, I will go over our five client segments. Individual customers posted the strongest account growth in 2019, up 18% over last year, and make up 50% of our accounts, 35% of our client equity, and half of our annual commissions. This is a lucrative and well-diversified customer segment that had client equity growth of 36% for the year. So, as would be expected with significantly lower volatility, stock commissions declined 9% for the year. The worldwide increase in securities markets in the fourth quarter helped our customers’ account performance, and we were pleased to see particularly strong account growth internationally. Introducing brokers posted account growth of 16% and are 31% of our overall accounts. Client equity grew 47% over the past year, and is 23% of our total, while commissions saw a slight decline of 2%, and are 9% of our total. Smaller and mid-sized brokers as well as international ones continue to find it difficult both to justify building and maintaining their own technology and to offer the global access their customers want. So, they come to us to white brand our state-of-the-art technology and capitalize on our low costs. As competitive pressures increase, and as agencies in various countries increase their compliance oversight of the financial services industry, the commitment and costs required to only grow over time encouraging more brokers to come to us. We have not yet seen any change in the ability of our Mainland China accounts to fund. Up until the end of last year, we had extremely fast account growth in China, and then it suddenly slowed significantly. We hear that there are roughly 8,000 people a week who try to open an account with us, and only about 15% of them are able to fund. We do not have any reason to believe this will change in the near future. Hedge funds constitute 1% of our accounts, 9% of our client equity, and 9% of our commissions as of December 31. For the year, we saw growth of 4% in hedge fund accounts and 30% in client equity. Growth achieved despite the hedge fund industry overall experiencing outflows. Hedge fund commissions declined 14%, again due to lower market volatility, which can limit trading opportunities. Hedge funds remain a large multi-trillion dollar global market, and we continue to have tremendous room to grow in this area. Proprietary trading firms are 2% of our accounts and 11% of our client equity, and 15% of our commissions. For the year, this group grew 14% in accounts and 41% in client equity, while their commissions fell 7%. Despite already being well-penetrated in the segment, the growth here shows that our platform continues to demonstrate value and appeal for sophisticated traders and their larger accounts. Finally, we have financial advisors. They are 15% of our accounts, 22% of our customer equity, and 16% of our commissions. Accounts in this group grew by 8%, client equity by 24%, while commissions declined 12% for the year. Two factors will continue to drive this business. Our Greenwich Compliance Group, which provides registration and compliance assistance for new and existing RIAs continues to sign up RIAs who you want to open their own businesses or move away from an existing clearing firm. Going independent means RIAs can keep all the fees they earn in an environment where more advisors are looking to become independent, our low commission, and financing rates, high rates of interest paid on cash and the availability of Greenwich Compliance's services all contributes to growth in this segment. Second, with consolidation among our competitors, we have heard from many advisors who do not want to compete for clients with their clearing firm, or be subject to the hidden fees that always seem to sprout up. We welcome all of them with transparent pricing, no competing in-house advisors, free portfolio performance reporting, a free CRM, and global market access. There is a lot that we're looking forward to in 2020 to improve and enhance the customer experience. You will first see our newly-launched Bond Scanner, where our clients can enjoy low fully transparent commissions on bonds with no mark up on bond prices. We offer a full universe of U.S. government securities, as well as over 33,000 CDs, 38,000 corporate bonds, and 1.4 million municipal securities. You can search our inventory, or compare available yields against those of other brokers. We also offer filters that can help you select the yield or ratings you want. For all this, we will only charge 2.5 to 10 basis points on a corporate bond, and as always, we pass through the highest bids and lowest offers available at the electronic venues we access with no mark ups. We also have new markets, new improvements to our platform, and new product categories we will soon offer, all with the same experience Interactive Brokers team, who was told me not to say any more about our future plans. With that, I will turn the call over to our CFO, Paul Brody, who will go through the numbers for the quarter.