Material Adverse Change Clause: Buyer's Walk-Away Right

Key Takeaways

• A Material Adverse Change clause lets the acquirer terminate if the target suffers a serious company-specific deterioration between signing and closing.
• Economy-wide and industry-wide downturns are carved out; only disproportionate impact on the target compared to peers can trigger the clause.
• Delaware courts set an extremely high bar; Akorn v. Fresenius (2018) was the first and for years the only public-company MAC upheld in Delaware.
• Investors treating a bad quarter as an MAC trigger are wrong; courts require both magnitude and durational significance to find a qualifying event.

What It Is

In merger agreements the terms Material Adverse Change (MAC) and Material Adverse Effect (MAE) are used almost interchangeably. Both refer to a contractually defined event or condition that, if it occurs during the gap between signing and closing, allows the acquirer to refuse to close and terminate the deal.

The clause typically defines an MAC as any change or effect that is materially adverse to the business, financial condition, assets, or results of operations of the target. Crucially, the definition is paired with a long list of carve-outs: economy-wide downturns, industry-wide shocks, pandemics, natural disasters, war, acts of terror, changes in law or accounting, and failures to meet analyst estimates. These events do not count unless they hit the target disproportionately compared to peers.

The Intuition

Large deals take months to close. During that window the target continues to operate and things can go wrong. Shareholders on the sell side want certainty that the deal will close at the agreed price. Buyers want protection against catastrophic deterioration. The MAC clause splits the risk. Ordinary operating fluctuations and economy-wide shocks stay with the buyer. Company-specific disasters can be pushed back to the seller.

The carve-outs exist because the acquirer has already priced the target's industry exposure. If the whole airline sector drops 20 percent, an acquirer of an airline should not get a free walk-away. But if that particular airline is grounded by a safety finding while competitors fly, the buyer has a case.

How It Works

A typical MAC clause has three layers.

The core definition. Broad language about any change that has, or would reasonably be expected to have, a material adverse effect on the target. Courts consistently require the effect to be substantial in both magnitude and durational significance. A single bad quarter rarely qualifies. A multi-year structural decline might.

The carve-outs. A list of events that are excluded from the definition. Economy, industry, general financial markets, war, terrorism, pandemic, weather, seasonal variations, acts or omissions taken with the acquirer's consent, and changes in law or accounting standards.

The disproportionate-impact qualifier. Most carve-outs come back in if the target is hit worse than its peers. This is where most litigation focuses. The question becomes whether the target's decline is merely industry-wide or meaningfully worse.

The burden of proof. Under Delaware law, which governs most large US deals, the acquirer bears the burden of proving an MAC occurred. Delaware courts have set an exceptionally high bar. For more than two decades after the clause became standard, no Delaware court had found that one was triggered.

That changed in Akorn, Inc. v. Fresenius Kabi AG in 2018. Fresenius agreed to buy Akorn for $4.75 billion in 2017. After signing, Akorn's financial performance dropped off a cliff and the company was found to be in serious, persistent violation of FDA data-integrity rules. Vice Chancellor Laster of the Delaware Court of Chancery ruled that two independent MAEs had occurred, one general and one regulatory. The Delaware Supreme Court affirmed in December 2018. Akorn remains the first and for years the only case in which a Delaware court permitted an acquirer to terminate a public-company merger agreement under an MAC clause.

Worked Example

Suppose Bidder Co. agrees in January to acquire Target Co. for $5 billion, with closing scheduled for July. In May, Target's largest manufacturing plant is shut down by regulators for safety violations unique to Target's practices. Second-quarter revenue falls 60 percent year over year, far worse than peers, which decline 5 percent from general industry softness.

Bidder asserts an MAC. The shutdown is company-specific, not industry-wide, so the general-conditions carve-out does not apply. The decline is disproportionate to peers, clearing the qualifier. The effect is substantial and appears durational given the regulatory root cause. A Delaware court faced with these facts would consider Akorn-style analysis: magnitude, durational significance, and disproportionate impact. Bidder's position is strong, though far from automatic given the historical reluctance of Delaware courts to find MACs.

Common Mistakes

1. Assuming a bad quarter triggers an MAC. Courts have repeatedly rejected MAC claims based on short-term earnings misses. The decline typically needs to signal a long-term impairment of the business, not a one-off.

2. Ignoring the disproportionate-impact carve-back. A large target-specific decline that happens during a broader sector downturn still requires showing the target did worse than peers. Without peer-relative data, the claim is hard to win.

3. Overlooking specific representations. Akorn was partly decided on Akorn's breach of representations regarding regulatory compliance, not only the broad MAC definition. Representation breaches often do more work than the headline MAC clause.

4. Using MAC threats as negotiation leverage. Buyers who publicly assert an MAC and then close anyway can face securities fraud exposure. Courts and regulators view these tactics skeptically.

5. Forgetting the litigation cost. Even a strong MAC case often settles in repricing because litigating a merger termination publicly is slow, expensive, and disruptive to both sides.

Frequently Asked Questions

Q: What is a material adverse change clause in simple terms? A MAC clause is an escape hatch in a merger agreement that lets the buyer walk away without paying a break fee if the target suffers a severe, company-specific deterioration between signing and closing. It is heavily negotiated because Delaware courts almost never agree that one has been triggered.

Q: How does a MAC clause affect investment decisions? For merger-arb investors, a MAC claim by the acquirer is one of the most severe deal-break risks. However, courts almost never uphold them, Akorn v. Fresenius (2018) was the first Delaware case to succeed. Pricing MAC risk higher than the base-rate probability is a common mistake.

Q: What is a real-world example of a MAC claim? In Akorn v. Fresenius (2018), Fresenius agreed to buy Akorn for $4.75B. After signing, Akorn's financial results collapsed and serious FDA data-integrity violations emerged, company-specific, not industry-wide. The Delaware court found two independent MAEs and allowed Fresenius to terminate, the first time this had ever happened in a Delaware public-company deal.

Q: How can investors spot a viable MAC claim vs. one that will fail? Look for (1) a company-specific cause, not a broad market or industry decline; (2) a disproportionate impact compared to peers; and (3) a durational significance suggesting long-term impairment, not a temporary earnings miss. Single bad quarters rarely qualify. Regulatory violations or product recalls specific to the target can qualify.

Q: How is a MAC clause different from a reverse termination fee? A MAC clause is a condition allowing the buyer to walk without paying a termination fee if triggered legitimately. A reverse termination fee is a contractual cash payment the buyer owes the target if the buyer walks for other specified reasons (like antitrust failure or financing failure). They address different risks and flow in different directions.

Sources

1. Harvard Law School Forum on Corporate Governance. "Drafting Considerations from the MAC Decision." https://corpgov.law.harvard.edu/2018/11/18/drafting-considerations-from-the-mac-decision/
2. Jones Day. "Delaware Chancery Court Finally Finds an MAE." https://www.jonesday.com/en/insights/2018/10/delaware-chancery-court-finally-finds-an-mae
3. Business Law Today (ABA). "Akorn: Establishing a Material Adverse Effect." https://businesslawtoday.org/2019/01/akorn-establishing-material-adverse-effect/
4. Gibson Dunn. "Evolution of the Material Adverse Effect Clause." https://www.gibsondunn.com/wp-content/uploads/2019/06/Becker-Glover-Alterbaum-Evolution-of-the-material-adverse-effect-clause-Financier-Worldwide-06-2019-1.pdf

Disclaimer

This article is educational content only and is not financial advice. Nothing here is a recommendation to buy, sell, or hold any security. Consult a licensed advisor before making investment decisions.