U.S. Chamber of Commerce

Rule Changes

Lead plaintiff, prevailed at district court

The Hart-Scott-Rodino premerger notification form went largely unchanged for 48 years. When the Federal Trade Commission tripled its compliance burden in 2024, business groups sued, and a Texas federal judge just agreed.

Updated May 29

Rule Changes

Lead plaintiff in HSR rule challenge

The United States raised the federal antitrust review threshold to $133.9 million on February 15, 2026—up from $126.4 million the previous year. Companies planning mergers or acquisitions above this threshold must file premerger notifications with the FTC and DOJ and await government clearance before closing.

Updated May 29

Rule Changes

Filed amicus brief supporting employers

When employers exit multiemployer pension plans, they owe a share of unfunded benefits—a calculation that hinges on assumptions about future investment returns. The IAM National Pension Fund changed its interest rate assumption from 7.5% to 6.5% in January 2018, weeks after the measurement date, and applied it retroactively to employers who had already withdrawn. The result: withdrawal liabilities tripled from $935 million to over $3 billion.

Updated May 22

Rule Changes

Lost lawsuit challenging $100,000 H-1B fee, December 24, 2025

On December 29, 2025, the Department of Homeland Security published its final rule replacing the H-1B lottery with wage-weighted selection. It takes effect February 27, 2026.

Updated May 16

Rule Changes

Plaintiff in a separate earlier federal suit challenging the fee

The Trump administration imposed a $100,000 fee on new H‑1B visa petitions. Now twenty states are suing to overturn that fee in federal court, calling it an illegal end-run around Congress.

Updated May 15