Putnam Sustainable Future ETF (PFUT) is an actively managed exchange-traded fund that seeks long-term capital appreciation by investing primarily in common stocks of U.S. companies of any market capitalization, with a focus on those whose products and services provide solutions to sustainability challenges in social, environmental, and economic development; it employs a framework of fundamental research, forward-looking sustainability themes, and integration with equity research and quantitative risk analysis. The fund's portfolio features holdings across sectors such as information technology (approximately 24%), health care (16%), industrials (15%), and consumer discretionary (14%), including top positions in companies like Hilton Worldwide Holdings Inc., Datadog Inc., Verisk Analytics Inc., Vertiv Holdings Co., and Quanta Services Inc.; it is benchmarked against the Russell Midcap Growth Index, with a net expense ratio of 0.65% and total net assets of around $379 million as of mid-2025. PFUT was incepted on May 25, 2021, lists on NYSE Arca, and is managed by a dedicated sustainable investing team at Putnam Investments, including Katherine Collins, Stephanie Dobson, and Rob Forker; Putnam Investments, headquartered in Boston, Massachusetts, now operates as a wholly-owned subsidiary of Franklin Resources, Inc. (doing business as Franklin Templeton) following Franklin's acquisition of Putnam from Great-West Lifeco, Inc., completed on January 1, 2024, which expanded Franklin Templeton's assets under management to over $1.55 trillion and bolstered its sustainable investing capabilities with Putnam's $9.1 billion in sustainable fund assets. Recent developments include the January 2023 launch of PFUT alongside four other ESG-focused ETFs by Putnam, such as Putnam Sustainable Leaders ETF (PLDR), to extend active management into sustainable equity strategies; post-acquisition integration has preserved Putnam's investment teams and client relationships while enabling extended access to its capabilities internationally, as announced in December 2025; the fund remains a non-transparent ETF utilizing a daily tracking basket to facilitate trading, with assets primarily in U.S. equities (95%), non-U.S. stocks (3%), and cash (2%).