BlackRock U.S. Carbon Transition Readiness ETF (LCTU) seeks long-term capital appreciation through active management of a portfolio comprising large- and mid-capitalization U.S. equity securities selected from the Russell 1000 Index; the fund optimizes holdings based on proprietary Low Carbon Economy Transition Readiness (LCETR) scores, prioritizing companies demonstrating superior readiness for the transition to a low-carbon economy relative to industry peers, including those with lower carbon emissions intensity, stronger decarbonization strategies, and alignment with net-zero targets. Core offerings include exposure to U.S. equities across sectors such as technology (e.g., NVIDIA, Apple, Microsoft among top holdings), consumer discretionary, healthcare, and financials; the portfolio encompasses approximately 300-314 holdings with a focus on blend-style large-cap investments, a net expense ratio of 0.15% (after fee waivers), and sustainability metrics like an MSCI ESG Quality Score of 6.55 and weighted average carbon intensity of 42.13 tons CO2e/$M sales. Launched on April 6, 2021, and domiciled in the United States with assets under management exceeding $1.4 billion, the ETF operates primarily in U.S. markets, targeting institutional and retail investors seeking ESG-integrated equity exposure that aims to outperform the Russell 1000 Index before fees. Managed by BlackRock portfolio managers Jonathan Adams (since inception) and Suzanne Ly (since August 2022), it forms part of BlackRock ETF Trust under the iShares brand. In recent developments, the fund has sustained robust inflows and institutional interest, with total net assets growing to $1.42 billion amid ongoing portfolio rebalancing to reflect updated LCETR assessments and MSCI ESG data as of September 2025; it maintains a fee waiver reducing expenses through at least late 2025 while delivering strong performance, including 24.07% total return in 2024 and year-to-date gains of 14.23% through late 2025. No major acquisitions, partnerships, or structural changes have been reported in the last 1-2 years, reflecting steady operational focus on active carbon transition optimization.