Robert Lilien
Analyst · Jefferies
Thank you, Amit. Last quarter, I outlined some of the key focus areas for 2021. I talked about accelerating our momentum through targeted investments in both today's growth and tomorrow's. I talked about continued progress with our model portfolio offering. I talked about new global product launches with a focus on core, tactical, thematic and ESG exposures. I talked about maintaining our leadership position in crypto ETPs, while also establishing ourselves as a leader in digital assets and how this last initiative holds the promise for WisdomTree to tap additional revenue streams, further accelerating organic growth in what we see as the next chapter in financial services.
As our Q1 results make clear, we are executing well on all fronts. We have momentum and are generating strong organic growth. Overall, top line growth led to a very strong all around quarter with inflows driving record AUM and strong revenues and expanding operating margins and net income. Our team remains focused and dedicated to strong execution. And this and the breadth and diversified mix of our business gives us confidence that our momentum will continue.
Regarding organic growth, we are enthusiastic about global flows, industry-driven gold outflows notwithstanding. We have the broadest range of gold ETCs available and our success in industrial metals, copper and silver shows that there is a wider opportunity for us to capture.
Further, thematics have been a strong success, where we strive for differentiated and thoughtful exposures through a combination of our internal research and collaboration with deep subject matter experts. Our thematic suite, including cloud computing, artificial intelligence, battery technology and cybersecurity saw strong inflows across both our U.S. and European platforms.
In the U.S., our model portfolio initiative also continues to stand out. We are converting on previously announced successes like our third-party model mandate with Merrill and through collaborations, such as tax-smart portfolios with 55ip.
In the first quarter, we launched our Model Adoption Center, the MAC, which provides holistic support and solutions for advisers to leverage our portfolio analytics and investment capabilities for their end clients. Overall, our model portfolio initiative is gaining more traction and is facilitating deeper client relationships, larger client relationships and stickier and more diversified flows.
In the coming quarters, we anticipate announcing additional major model partnerships and leveraging additional collaborations, such as our recently discussed relationship with Onramp Invest, a financial technology start-up, which will allow us to incorporate crypto assets into RIA workflows and into our models for RIAs.
In terms of mix and breadth, our emerging markets ex state-owned enterprise fund, XSOE, was a Q1 star with its sister ex state-owned China fund, CSXE, also contributing. Following the implementation of additional ESG screens during the quarter, we're excited about our strong position in the strategically important categories of both emerging markets and ESG investing.
But the quarter was really marked by the overall diversity and breadth of our flows. In the U.S., a growing percentage of our funds are seeing inflows, while a declining percentage of our funds are seeing outflows. Further, 1/3 of our U.S. funds hit new all-time AUM highs, and globally, we now have 32 funds with AUM over $500 million and 20 over $1 billion.
This diversity and breadth is fueling our momentum, where including April, the U.S. now has 10 consecutive months of inflows, the best such streak in 6 years. In Europe, we're building on 2 consecutive years of record organic growth. And in April, we're also seeing positive flows. Group run rate revenue based on current AUM levels is now at $300 million, up nearly 40% from the first quarter of last year, and this breadth and healthy mix is also showing up in fees where our fee captures remained steady and is actually up from Q4 levels.
Our strong product pipeline further adds to this mix and diversity and represents yet another element of our increasing momentum. We continue to advance the robustness of our existing fixed income and commodities offerings as well as adding additional new products in thematics and growth equities.
In the cryptocurrency space, earlier this month, we cross listed our European domiciled Bitcoin ETP, BTCW, in Germany, allowing for a wider audience to have easy access, which should help accelerate growth. And just yesterday, we launched a physically backed Ethereum ETP, ETHW. And last month in the U.S., we filed for the WisdomTree Bitcoin Trust. All in all, we are delivering against our plan to drive growth, both today's and tomorrow's, and the results are shining through.
And with that, I will hand it over to Jono to speak more about our larger digital assets initiatives, along with his concluding thoughts on the quarter.