Investing.com -- The U.S. Department of Justice is actively weighing whether to intervene in a high-stakes state antitrust lawsuit against asset management giants BlackRock Inc (NYSE: BLK) and State Street Corp (NYSE: STT), Bloomberg reported, citing people familiar with the matter. Senior antitrust officials have held discussions in recent weeks with involved state attorneys general and company representatives, though federal officials have yet to reach a final determination on joining the litigation.

The core dispute stems from a late 2024 lawsuit led by Texas alongside 12 other state attorneys general, which alleges the investment managers leveraged their vast market power and climate coalition memberships to curb coal production and inflate regional energy prices. The legal challenge stands as one of the most prominent institutional broadsides against environmental, social, and governance (ESG) investment strategies to date.

Federal interest in the proceedings is not entirely unprecedented, as both the Justice Department and the Federal Trade Commission filed a joint statement of interest in May 2025 indicating that the alleged conduct, if proven, would constitute antitrust violations. However, direct federal participation would significantly raise the stakes for institutional asset managers navigating conservative legal scrutiny over climate-focused investing practices.

The ongoing litigation has already reshaped the legal strategy of major industry peers. Vanguard Group Inc., originally named as a co-defendant in the filing, resolved its involvement in February by agreeing to a $29.5 million settlement while committing to restrict ESG targets across its portfolios, despite denying all underlying claims.

A federal judge cleared the case to move forward against BlackRock and State Street in August 2025, setting the stage for deeper legal discovery into how these institutions exercise proxy voting rights and corporate influence. Market participants and legal analysts now remain focused on whether Washington’s formal entry will transform a regional coalition strategy into a systemic federal enforcement action against institutional asset managers.