Financial Glossary
Material adverse change (MAC)
A material adverse change (MAC) clause -- sometimes called a material adverse effect (MAE) clause -- is a contractual provision that allows a buyer, lender, or investor to walk away from or renegotiate a transaction if a significant negative event occurs between signing and closing (or during a financing period) that substantially impairs the target company's financial condition, business, or prospects. MAC clauses typically include negotiated carve-outs for industry-wide downturns, general economic changes, regulatory shifts, and market-wide events -- meaning a buyer generally cannot invoke MAC to exit a deal just because the broader economy deteriorated. Courts have historically set a high bar for invoking MAC successfully.
Problem & Application
A private equity firm signs a purchase agreement to acquire a campground portfolio for $50 million. Before closing, one of the portfolio's flagship properties suffers a flood that destroys 40 cabins, reducing projected EBITDA by 35%. The buyer argues this constitutes a MAC and seeks to renegotiate the price. The seller counters that the flood is a natural disaster -- arguably a carve-out event -- and demands closing at the agreed price. The outcome depends on specific contract language. In practice, most deals settle through purchase price adjustments rather than litigation. Understanding MAC clause scope is essential for operators and their advisors during deal negotiations, particularly for businesses with significant weather or seasonal operating risk.
In Short
MAC clauses are critical in protecting parties in agreements, ensuring that both sides can mitigate the risks posed by major negative changes in circumstances.
