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State Street Corporation (NYSE: STT) today announced the expansion of its nearly 40‑year relationship with Thornburg Investment Management, Inc. (Thornburg), providing end‑to‑end servicing support for Thornburg's new ETF share classes as the firm broadens access to its active, high‑conviction investment strategies.
Thornburg is a privately owned, global investment firm managing approximately $57 billion in client assets 1 as of March 31, 2026. Headquartered in Santa Fe, New Mexico, the firm is known for its disciplined, research‑driven approach across equity, fixed income, multi‑asset, and alternative strategies, serving institutions, financial professionals, and investors worldwide.
Under the expanded mandate, State Street will deliver comprehensive ETF servicing for Thornburg's new share classes, including custody, accounting, ETF basket creation, create‑and‑redeem order management, ETF settlement, transfer agency, and reporting. The announcement marks only the second active ETF share-class servicing mandate in the US, with State Street serving as provider, underscoring momentum among active managers seeking greater flexibility in how they deliver their strategies to investors. This highlights State Street's position as a pioneering leader and enabler of clients' ability to come to market with novel products. As the number one provider of ETF services globally, State Street is once again paving the way for the industry's ability to innovate at scale.
The expansion builds on a relationship that began in 1987. Today, State Street provides full‑service support across Thornburg's product lineup, including mutual funds, ETFs, closed‑end funds, and UCITS vehicles.
"Thornburg has a long history of delivering differentiated, actively managed strategies, and we're proud to support the continued evolution of their ETF platform," said Donna Milrod, chief product officer at State Street. "Our role is to provide the operational scale and flexibility that allows clients to focus on investment outcomes, while ensuring a consistent and seamless experience across fund structures."
Thornburg first partnered with State Street to launch its initial suite of active ETFs in January 2025. The introduction of ETF share classes represents a natural extension of that platform, reflecting growing investor demand for choice and flexibility in accessing active strategies.
"State Street has been a trusted partner to Thornburg for decades," said Mark Zinkula, CEO of Thornburg. "Their deep experience across fund structures and their ability to support the full ETF lifecycle positions them well to help us meet evolving client needs."
About State Street Corporation
State Street Corporation (NYSE: STT) is one of the world's leading providers of financial services to institutional investors including investment servicing, investment management and investment research and trading. With $53.8 trillion in assets under custody and/or administration and $5.7 trillion* in assets under management as of December 31, 2025, State Street operates globally in more than 100 geographic markets and employs approximately 52,000 worldwide.
*Assets under management as of December 31, 2025 includes approximately $173 billion of assets with respect to SPDR ® products for which State Street Global Advisors Funds Distributors, LLC (SSGA FD) acts solely as the marketing agent. SSGA FD and State Street Investment Management are affiliated.
© 2026 State Street Corporation
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The Advisor and certain Portfolios have received an exemptive order from the Securities and Exchange Commission permitting these Portfolios to offer both a mutual fund share class and an exchange-traded share class that operates as an ETF. Under this structure, the ETF class shares are listed and traded on a national securities exchange and are generally bought and sold at market-determined prices, whereas the mutual fund share classes are purchased and redeemed at the Portfolio's net asset value next determined after receipt of the order. Because all of the classes of a multi-class Portfolio are based on the same portfolio, transactions through one class could generate portfolio transaction costs and tax consequences for shareholders in other classes. In addition, shareholders of the mutual fund and ETF classes of a multi-class Portfolio will have differing shareholder rights with respect to exchange privileges, how shares are purchased and redeemed, the timing of dividend declarations and payments, and the timing and ability to automatically reinvest dividends. For additional information regarding these differences, please see the applicable multi-class Portfolio's prospectus.
Each Fund's ETF Class shares are listed and traded on a national securities exchange and, unlike the Fund's mutual fund class shares, are not individually redeemable. In addition to ETF Class shares, the Fund offers one or more classes of mutual fund shares. An investment in the Fund's ETF Class shares is not an investment in a mutual fund.
The Fund's ETF Class shares are distributed by ALPS Distributors, Inc.
1 Includes $56 billion in assets under management and $1 billion in assets under advisement as of March 31, 2026.
View source version on businesswire.com: https://www.businesswire.com/news/home/20260409147862/en/
Media Contact:
Brendan Paul
bpaul2@statestreet.com
+1 401 644 9182
