Deal StructureLegal
Material Adverse Effect (MAE)
Also known as: MAE clause, MAC clause, material adverse change, walk-away right
A clause giving the buyer the right to walk away from the deal before closing if a defined negative event occurs. The breadth of that definition determines whether the buyer holds a reasonable protection or a free option.
WHY IT MATTERS
Why it matters. The MAE clause gives the buyer a contractual exit before closing if something materially bad happens to the business. The problem is the definition. A broad MAE covers revenue declines, customer losses, key employee departures, regulatory changes, and a catch-all for anything that 'could reasonably be expected' to have a material adverse effect. That language gives the buyer a free option: they don't need to invoke the clause to extract value. The threat of invocation changes the power dynamic. A bad quarter, normal customer churn, or macroeconomic noise becomes leverage for price adjustments or harsher terms. Founder-favorable versions narrow the definition with extensive carve-outs for general economic conditions, industry downturns, and market-wide events. They also include mutual termination rights after a drop-dead date and a reverse break fee if the buyer walks without a legitimate MAE.