Thank you, Nancy. Good afternoon, everyone. I will review the first quarter results and then, of course, we'll open it up for questions. Starting with our revenue items on Page 3 of the release, we're pleased with our financial results this quarter as we again produced record net revenues and pre-tax income. Commissions rose versus last year's first quarter, reaching $379 million. This quarter, we saw higher trading volumes from our growing base of active customers, particularly in options, which set a new quarterly volume record. Net interest income also reached a quarterly record of $747 million, reflecting a risk on environment in the quarter versus last year that led to more margin borrowing as well as higher yields on our margin loans and segregated cash portfolio. These are partially offset by the higher interest paid to our customers on their cash balances. Interactive Brokers passes through to them all rate hikes above the first 50 basis points on their qualified funds, which makes us attractive compared to other brokers and banks and competitive with money market funds. Other fees and services generated $59 million, up 37% from the prior year, driven by the risk on positioning of customers in the quarter. As we report in the financial highlights on Page 1 of our earnings release, the primary factor was an increase in risk exposure fees with a contribution from FDIC sweep fees as well. Other income includes gains and losses on our investments, our currency diversification strategy and principal transactions. Note that many of these non-core items are excluded in our adjusted earnings. Without these excluded items, other income was $31 million for the quarter. Turning to expenses, execution, clearing and distribution costs were $101 million in the quarter, up 6% over the year-ago quarter on higher volumes in options, which carry higher fees. As a percent of commission revenues, execution and clearing costs were 21% in the first quarter for a gross transactional profit margin of 79%. We calculate this by excluding from execution, clearing and distribution $21 million of non-transaction based costs, predominantly market data, which do not have a direct commission revenue component. Compensation and benefits expense was $145 million for the quarter, for a ratio of compensation expense to adjusted net revenues of 12%, down slightly from last year's quarter. We remain focused on expense discipline as reflected in our slowing the staff increase to 3% over the prior year. Our headcount at March 31 was 2,956. G&A expenses were $50 million, up from the year-ago quarter on higher advertising and legal expenses. Our pre-tax margin was 72% for the quarter. Income taxes of $71 million reflects the sum of the public company's $36 million and the operating company's $35 million. The public company's adjusted effective tax rate was 17.2%, within its usual range and similar to the prior year. Moving to our balance sheet on Page 5 of the release, the consistent strength of our business and our healthy balance sheet supports our raising the dividend from $0.40 per year to $1, returning capital to shareholders while still maintaining an ample capital base for the current business and future opportunities. Our total assets ended the quarter 11% higher at $132 billion with growth driven by margin lending to both new and existing customers. We continue to have no long-term debt. We maintain a balance sheet geared towards supporting growth in our existing business and helping us win new business by demonstrating our strength to prospective clients and partners. In our operating data, on Pages 6 and 7, our contract volumes in options for all customers rose 24% over the prior-year quarter, well above industry growth. Futures contract volumes and stock share volumes declined as they did across the industry. The decrease in stock share volume occurred in tandem with clients gravitating to larger, higher quality names with lower trading and pink sheet and other very low-priced stocks. In fact, despite the decline in share volume, the total notional value of brokerage shares traded was up in many markets, particularly in the U.S. On Page 7, you can see that total customer DARTs were 2.4 million trades per day, up 14% from the prior year, and especially strong in options followed by stocks and foreign exchange. Commission per -- cleared commissionable order of $2.93 was down from last year due to a mix of smaller average order sizes in stocks and options and larger in futures. Stocks and options contributed higher overall volumes but smaller average order sizes, while futures contributed lower volume with larger average order size. Page 8 shows our net interest margin numbers. Total GAAP net interest income was $747 million for the quarter, up 17%, while our NIM net interest income was $762 million, or $15 million higher. In the NIM computation, we include some income that for GAAP purposes is classified as other fees or other income, but we believe it's more appropriately considered interest. Our net interest income reflects strength in margin loan and segregated cash interest, partially offset by higher interest expense on customer cash balances. Most central banks around the world, including the Federal Reserve, held interest rates steady this quarter. Exceptions included a rate rise in Japan from negative 10 basis points to zero to positive 10 basis points, and a 25 basis point rate cut in the Swiss franc benchmark. Reflecting the rise in benchmark rates over the year, our segregated cash interest income rose 26% on a 2% increase in average balances, while margin loan interest rose by 42% on a 19% increase in average balances. The average duration of our portfolio remained at less than 30 days. With the U.S. dollar yield curve continuing to be inverted, we have been maximizing what we earn by focusing on higher short-term yields rather than accept the significantly lower yields of longer maturities. This strategy allows us to maintain a relatively tight maturity match between our assets and liabilities. Securities lending net interest has not been as strong as in prior quarters for three main reasons. First, throughout the industry, overall demand for shorting stocks has fallen. An extremely strong stock market, up in the U.S. nearly 30% in the past year and 10% in the first quarter alone means fewer people are looking to put on shorts when the overall market trend is so soundly upward. Second, there are fewer hard-to-borrow names industry-wide, not only because the overall market is rising sharply, but also due to weakness in some of the drivers relevant to securities lending, including significantly fewer IPOs, low market volatility, and less merger and acquisition activity. Finally, as noted on previous calls, higher average interest rates versus prior-year periods means more of what we earn from securities lending is classified as interest on segregated cash. To more accurately compare our securities lending revenue with last year, we estimate that if the additional interest earned on cash collateral were reported under securities borrowed and loaned, it would have been $12 million higher or $38 million. Interest on customer credit balances, the interest we pay to our customers on the cash in their account, rose on both higher rates in nearly all currencies and higher balances from new account growth. As we have noted many times in the past, the high interest rates we pay on customer cash, currently 4.83% on qualified U.S. dollar balances, is a significant driver of new customers. Fully rate-sensitive customer balances were about $18.5 billion this quarter versus $17.2 billion in the year-ago quarter, and firm equity, most of which consists of interest-earning assets, increased 20% over the prior year. Now, for our estimates of the impact of changes in rates. Given market expectations of rate cuts sometime in 2024, we estimate the effect of a 25 basis point decrease in the benchmark Fed funds rate to be a $58 million reduction in annual net interest income. Note that our starting point for this estimate is March 31, with the Fed fund's effective rate at 5.33% and balances as of that date. Any growth in our balance sheet and interest-earning assets would reduce this impact. About 25% of our customer cash balances is not in U.S. dollars, so estimates of a U.S. rate change exclude those currencies. We estimate the effective decreases in all of the relevant non-USD benchmark rates would reduce annual net interest income by $18 million for each 25 basis point decrease in those benchmarks. At a high level, a full 1% decrease in all the benchmark rates would decrease our annual net interest income by about $304 million. This takes into account rate-sensitive customer balances and firm equity. In conclusion, we started the year with another financially strong quarter in net revenues and pre-tax margin, reflecting our continued ability to grow our customer base and deliver on our core value proposition to customers while scaling the business. We raised our dividend in recognition of our financial strength. Our business strategy continues to be effective, automating as much of the brokerage business as possible and expanding what we offer while minimizing what we charge. With that, I'll turn it over to the moderator, and we'll open up the line for questions.