Christopher R. Concannon
Chief Executive Officer at MarketAxess
Good morning, and thank you for joining us to review our fourth quarter and full year results. Our underlying revenue growth trends improved during the fourth quarter as we continued to execute our growth strategy. We delivered 11% revenue growth, including the benefit of our Pragma acquisition. Earnings per share was $1.84, an increase of 16%. U.S. high-grade transaction revenue increased 14%, emerging markets increased 8% and Eurobonds increased by 7%. With these improved results in the quarter, we delivered our 15th straight year of record annual revenue.
Turning to my strategic update on Slide 3. First, we are delivering innovation with the launch of our new trading platform X-Pro, designed to address our U.S. credit market share challenges by retooling the delivery of our trading offering. We are pleased to see our portfolio trading clients increasingly leveraging our unique pre-trade analytics like Tradability, which are only available through X-Pro. 30% of our portfolio trades were executed on X-Pro in the fourth quarter, up from 18% in the third quarter.
Next, we are enhancing our suite of automation tools with the addition of Pragma. We delivered new records across our automation suite of products in the quarter. Our automation products crossed a record $300 [Phonetic] billion in volume for the full year in the fourth quarter. Adaptive Auto-X, our new client algo solution moved out of the pilot phase during the quarter with a total of 13 clients, including six of the largest. Early results show promising transaction cost savings in U.S. high grade.
And last, in terms of execution, our client franchise has never been stronger with a record 2,100 active firms. We delivered strong growth in our international businesses, portfolio trading and municipal. We also generated record revenue in both our market data and post-trade businesses as our investments to broaden our geographic and product footprint continue to pay off.
Slide 4 summarizes how powerful data and content on our platform is helping traders achieve better trading outcomes. We want to capture the full spectrum of order flow in the market by helping traders manage their portfolio composition, protocol selection and counterparty optimization. Our data is at the core of these new initiatives we are delivering through X-Pro. From growing portfolio trading market share to increasing our share of larger size trades, our proprietary data is what differentiates us from other market solutions. In 2023, we had a record 390 million price responses from liquidity providers across our platform, which is growing at a three-year CAGR of 11%. This unique dataset and the magnitude of this price information is what powers our proprietary data and insights that we generate for clients on X-Pro.
Slide 5 highlights our action plan for stronger market share growth in corporate bonds in 2024. Using U.S. high-grade as a case study, we've done a very good job of electronifying [Phonetic] small-size tickets, which has been the key value proposition of MarketAxess since our founding. While the history of electronification would indicate that the largest most complicated block trades would be the last to adopt electronic solutions, our market has jumped right through the largest and most complicated trades: the portfolio trade. What is left in the middle is trade sizes $5 million or greater, which is the target market for the rollout of X-Pro. We've heard from our clients that they need better data and workflow solutions to manage this part of the market. In this environment, hiring more traders is not the answer.
To help our clients manage protocol and counterparty selection for larger-sized trades, we have launched Tradability and AI Dealer Select. Tradability helps determine depths of market, while AI Dealer Select helps clients determine the right dealers to engage. With Adaptive Auto-X, we are also helping clients manage larger size trades by leveraging our different trading protocols, including Open Trading. Helping clients manage small and large-sized trades with pre-trade data and analytics, growing our share of portfolio trading and enhancing our dealer-centric trading protocols like dealer RFQ are key objectives for 2024.
Slide 6 provides an update on market conditions. In the fourth quarter, ETF market maker ADV on our platform was up 68% from the third quarter as market conditions improved, but was still down 19% from the prior year. Since the Fed pivot in early December, we have seen a pickup in duration, which has had a positive impact on our U.S. high-grade fee capture.
Before I turn the call over to Rich Schiffman, I want to provide an update on January activity with one final important trading day remaining in the month. January trends show solid low double-digit growth in U.S. high-grade ADV year-over-year, with estimated market ADV up approximately 15%, indicating lower estimated market share. January is historically a lower market share month, given seasonally strong new issuance in January. Over $190 billion [Phonetic] has been issued to date in January, making it the highest January on record. As a result, trading in newly-issued bonds represented approximately 15% of the market, up from an average of 8%.
U.S. high-yield ADV is down approximately 30% from elevated levels in the prior year. The decline is driven by lower ETF market maker activity, an increased focus on distressed names that do not lend themselves to electronic platforms, and an increased focus on a strong new issue calendar by our long-only [Phonetic] accounts. Estimated market ADV is down approximately 9%, indicating significantly lower estimated market share. Portfolio trading is on track to be a record month with ADV of approximately $800 million, up approximately 160% from the prior year.
Now, let me turn the call over to Rich to provide you with an update on our market.