WA SB5122

Requires persons filing federal Hart-Scott-Rodino premerger notifications to simultaneously file electronic copies with the Washington Attorney General if they have their principal place of business in the state, have annual net sales of at least 20% of the federal filing threshold, or are healthcare providers conducting business in Washington

Mandates strict confidentiality protections for all filed forms and documentary materials, exempting them from public disclosure requirements, with limited exceptions for administrative proceedings or court actions under protective orders

Authorizes the Attorney General to impose civil penalties of up to $10,000 per day for noncompliance with filing requirements

Permits the Attorney General to share filed information with federal antitrust agencies and attorneys general in other states that have enacted equivalent confidentiality protections, with two business days' notice to the filing party

Effective date is July 27, 2025, applying only to premerger notifications filed on or after that date