Henry A. Fernandez
Chairman, Chief Executive Officer at MSCI
Thank you, Jisoo. Welcome everyone and thank you for joining us today. Apologies for my scratched voice and a little bit of coughing. Before I talk about -- yes, can you all hear me? Okay. Thank you, Jisoo. Welcome everyone and thank you for joining us today. Apologies for my scratched voice and a little bit of coughing. Before I talk about MSCI's financial performance, I just want to say that our hearts go out to the people of Ukraine, who are suffering through one of the worst humanitarian tragedies in Europe since 1945.
My sincere hope is that the world would ultimately emerge stronger from this crisis. With a deeper respect for self-determination, national sovereignty, and human rights, and a clearer sense of purpose among the liberal democracies of the world. The war has certainly put everything else in greater perspective for many of us. In the first quarter, MSCI delivered strong results that highlight both, the strong resilience and long-term potential of our all-weather franchise.
Not only our solutions helping clients navigate market volatility and asset rotation they're also helping them understand major structural changes in the global economy and the financial markets. Those changes include the fallout from Russia's invasion of Ukraine, rise in interest rates, elevated inflation and the needed transition to a low-carbon economy. During a period of historic geopolitical and economic turmoil, MSCI solutions have become increasingly more valuable to plans across the whole global investment industry.
To put our first quarter results in perspective, we posted our best first quarter on record for both new and net new recurring subscription sales. We achieved organic subscription run rate growth of about 14% and nearly to 96% retention rate. Our adjusted EPS topped 21% and we repurchased almost $800 million worth of MSCI shares. Of course, the biggest global event of the quarter was Russia's unprovoked and unjustified invasion of Ukraine. MSCI responded immediately providing essential support to our colleagues in the region and donating to key relief organizations. We made necessary adjustments to our existing products and business tides including swift changes to our indices.
While also developing new products, services and insightful research to capture the new global landscape. All of these demonstrated once again how fast and nimble MSCI can adapt to an unexpected global crisis. Our resilience and momentum have allow us to continue driving growth despite the uncertain environment. Indeed we are finding innovative ways to grow both inside and outside our traditional client base. For example, our traditional client base of asset managers and asset owners collectively deliver subscription run rate growth of 11% in the first quarter excluding acquisitions.
So far this year, we have already seen more than $2 billion worth of incremental AUM from new mandates, benchmark to the MSCI climate, private aligned indices by asset owners in APAC and in EMEA. We're also driving a strategic benchmark winds with asset managers who are licensing first term indices they have defined using MSCI's new Index Builder application. We have on-boarded about 18 clients onto the Index Buider platform already. At the same time, we keep adding new layers of growth in areas such as fixed income, ESG and climate, and private assets. This quarter our ESG and Climate retention rate with -- hit an all-time high of 98.7% we also recorded our second-best quarter ever for new ESG and Climate subscription sales.
These data points tell us two things. First, ESG continues to become increasingly embedded in the global investment process. Second, our clients recognize the value that MSCI, ESG and Climate offering can provide. We continue to work to position MSCI as a leading provider of Climate solutions in standard setup. As of the first quarter we've calculated implied temperature rise metrics for more than 10,000 issuers and nearly 134,000 funds.
The implied rise metric computes how the carbon emissions of companies and portfolios align or do not align with different global temperature pathways which are 1.5 or 2 degree Celsius increases. Like all of our solutions, MSCI Climate products run on data. To give our clients a truly comprehensive and transparent view of the investment opportunity sense, we are transforming the way we collect claims and build data across product lines and asset classes. As I mentioned back in January, MSCI has always been a data processing factory. Now we're also becoming a data-building machine. During moments of global uncertainty and disruptions, high quality data becomes even more valuable as investors try to understand the present and imagine the future.
MSCI also continuously look to the future to reinvent itself, including with respect to our organizational structure and agility. As previously announced, we made a number of senior leadership changes at the start of the year to support our ever-evolving business needs. These changes position us well for increased growth in the years to come. Likewise, our first quarter performance reflects the long-term investments we have made to build a durable diversify all-weather franchise while external conditions make it more difficult, our fundamentals remain very strong. As we have proven MSCI can deliver impressive results in every type of operating environment. This is what we mean by an all-weather franchise and with that let me turn the call over to Baer. Baer?