Jerre Stead
Analyst · William Blair
Thank you, Anthony, and good morning to everyone on our call. We very much appreciate you all joining us today. It's been about 2 months since I took the CEO position. We're moving very quickly to execute on initiatives that will accelerate revenue growth and margin expansion. I've said this before, Clarivate represents a unique and powerful set of assets. Our customers cannot operate effectively or efficiently without our products and solutions. We are a trusted, independent and indispensable partner to innovators everywhere, delivering critical data, information, workflow solutions and deep domain expertise.
We have numerous opportunities to invest in the right initiatives, leveraging our assets. To help us realize this, we've engaged the Boston Consulting Group to provide us with their objective evaluation of the best structure for Clarivate as a new public company. This will help us to accelerate our path to long-term sustainable profitable growth, and this quarter is the beginning of that path. I'll provide an overview of our second quarter results, share some of the progress we've made on important initiatives, and then Richard will provide more detailed financial commentary.
I'm very pleased with our results for this quarter, which were in line with our expectation. Adjusted revenue increased 2.5% on a constant-currency basis, and they were driven by solid adjusted subscription revenue growth of 5%. Annual contract value of subscription-based agreements increased 3.6% with revenue renewal rates approaching 92% for the 6-month period ending June 30. While we're pleased with 92%, we will always be striving for a higher renewal rate.
Adjusted EBITDA increased 8.4% to $73.2 million in the second quarter and free cash flow of $18 million for the 6 months ending June 30, was inclusive of approximately $30 million of merger-related expenses. We've also had some outstanding commercial wins, 2 of which I'll highlight. In May, we announced an exciting new distribution agreement with Standards Australia, including Australian Standards and other technical documents, further expanding Techstreet's library of industry codes and standards.
In July, we expanded our strategic partnership with White Rabbit, the leading domestic provider of trademark search and watch services in China. White Rabbit is now deploying CompuMark's artificial intelligence and image recognition technology to dramatically simplify and streamline trademark image search and watch processes for Chinese trademark professionals. I want to congratulate and thank all of my colleagues for their focus and hard work in achieving these results. It's not easy to work through the noise of a major merger in addition to the completion of the separation from Thomson Reuters and I'm very, very proud of our Clarivate team and their commitment to serving customers with excellence and ensuring that we deliver against our goals.
I'd like to share with you some of the insights we've gained through our -- one of our first initiatives we undertook, a better understanding of the voice of our customers. Those of you who know me will remember how strongly I believe in the importance of understanding the viewpoint of our customers and staying current with customer feedback on our performance. Without this insight, no company can sustain long-term profitable growth and risk becoming marginalized or obsolete. One of the very first things we did after the merger closed was to bring in a world-class customer experience service company to help us understand the customer's viewpoint and to identify improvement areas. We completed our first survey with many more to come in the future, and I'd like to share some of the findings and our actions.
First, our overall customer delight score was 76, which is quite strong, best-in-class is 80-plus. We have room for improvement on a good start. Second, our scores for information and insights and quality and products and services were 87% and 85%, respectively. These 2 categories measure our customers' opinions about our products and our content. These scores were very strong. To put that in perspective, I've not seen scores in those categories this high before. These were the best scoring questions. What that means is that our customers see tremendous value in our products across all of our business units.
As investors in Clarivate, this is important for all of us and is a very strong attribute for our company. If we don't have content solutions to customers value, it's hard, very hard to fix that problem and grow a successful company. However, if customers value our products, other issues are much easier to fix. So these scores represent great news and a really good start for Clarivate as a new public company.
Now moving on to our third score, which assessed whether or not we are easy to do business with. It was not surprising to many of us, we scored 54%, which is one of the lower scores I've seen on this question, the best practice is well north of 60%.
If we put this all together, what we've heard in our first survey is that our customers highly value our product offerings, while telling us that we are not an easy-to-do-business-with company. This insight highlights exactly what we need to do in order to improve and grow. It's about fixing processes, simplifying things and execution, all within our own control. And you can bet, we've already begin to get at this.
By focusing on customer delight and executing on our other strategies, we will improve Clarivate's organic growth trajectory. We'll deliver more of the growth to the bottom line, we'll drive towards best-in-class margins and free cash flow conversion.
As we've analyzed the survey results, we're developing a road map of actions we will take to address the feedback. This includes, adopting a better product and pricing enhancement strategies, by shifting from a product sales strategy to a value-based strategy, by integrating additional content and capabilities into existing products and increasing our pipeline of new products, by continuing to build strength in Asia as we capture significant opportunities in APAC, and therefore, accelerate revenue growth in that region and then in our company and by pursuing opportunities for inorganic growth and portfolio optimization.
M&A is an important part of our plan. While high levels of customer delight are critical to our future, so our leading levels of colleague engagement in the establishment of a very strong corporate culture. One of my goals is to ensure that our company is recognized as a great place to work and a great place in which to invest a career.
Shortly after the close of the merger, we got right to work on putting in place the strong vision, mission and values. I'd like to share those with you today. Our vision is, we will improve the way the world creates, protects and advances innovation. Our purpose of our mission is, we believe human ingenuity can transform the world and improve our future. And, importantly, our values define the way we work with one and other in all of our constituencies. The overarching idea of our values is that we will own our actions. We will act with integrity, we will be accountable to ourselves, our colleagues, our customers and our communities.
Our values are: aim for greatness; value every voice; and own our actions. I've had a long career leading companies in trying to inspire tens of thousands of colleagues. One of the things I've learned is that, without a strong culture and equally strong set of guiding principles, it's very hard to be a truly successful, long-term organization. I'm very proud of this work and think it's one of the best vision, mission and values I've been part of. I know it will serve us well as we move forward to a very successful future.
Now moving to 2019 guidance. We are reaffirming our guidance for 2019. Adjusted revenues in the range of $962 million in $995 million, adjusted EBITDA in the range of $290 million to $310 million and adjusted EBITDA margins of approximately 30%. In addition to this guidance, we have provided with you with our expectations for excess stand-alone cost and pro forma cost savings, which will help you get to our stand-alone adjusted EBITDA range, which remains unchanged guidance-wise between $325 million and $345 million.
To wrap it up, it's been a couple of really busy months but much progress made so far. I'm very proud, as I said, of the team who have stayed focused on serving our customers with excellence and delivering on our commitments and goals. I'm confident that by continuing to focus, simplify and execute, we will deliver on our stated goals for years to come.
Before I turn the call over to Richard, I want to share with you that our company will hold our first-ever Investor Day in New York, on Tuesday, November 12. This will include presentations from our commercial leadership team, and we will also feature product demonstrations that you can see how our products and solutions are used by our customers. We very much look forward to seeing you there and continuing to update you on our progress.
I'll now turn it over to Richard to discuss the financial results before we open up for your questions.