M&A in 2026: The Deal Is No Longer Just About the Deal

For companies pursuing acquisitions, the most important number may no longer be the purchase price. It may be the competitive impact of the transaction.

Mergers and acquisitions remain one of the most powerful tools for corporate growth. They provide access to customers, technology, talent, intellectual property and new markets, often faster than building those capabilities internally.

But the regulatory environment surrounding M&A is becoming more nuanced.

The message for corporate America is not that acquisitions are being shut down.

It is that companies need to think differently about how they structure, evaluate and defend deals.

The $133.9 Million Number Can Be Misleading

The 2026 Hart-Scott-Rodino (HSR) threshold for transactions subject to the federal pre-merger notification system is now $133.9 million. But that number is not a universal line separating reportable deals from non-reportable deals.

Transactions between $133.9 million and $535.5 million generally require additional analysis under the applicable size-of-person test, while transactions above $535.5 million generally do not require that test. Various exemptions can also apply. (ftc.gov)

More importantly, HSR reporting and antitrust legality are not the same thing.

A transaction that does not require an HSR filing is not automatically immune from antitrust scrutiny.

That distinction is critical for executives.

No Filing Does Not Mean No Risk

Consider a hypothetical acquisition.

A large company acquires a smaller competitor for $50 million.

Because the transaction is below the HSR threshold, it may not require a pre-merger filing.

But what if that $50 million company is one of only two meaningful competitors in a specialized market?

The government's concern is no longer simply the size of the transaction.

It is the effect of the transaction.

Does the acquisition eliminate an important competitor? Does it increase concentration? Could it reduce choices for customers? Could it give the buyer greater leverage over suppliers or workers?

A small deal can have a large competitive footprint.

That is one of the most important concepts for executives to understand in today's M&A environment.

The Rise of "Serial Acquisition" Scrutiny

There is another issue gaining importance: serial acquisitions.

Imagine a company acquiring ten businesses over several years.

Each transaction individually may be relatively small.

But collectively, those acquisitions can transform the competitive structure of an industry.

This is particularly relevant in sectors where private equity or strategic buyers are building platforms through repeated acquisitions.

Regulators have expressed concern about strategies in which numerous smaller acquisitions may collectively reduce competition. (ftc.gov)

That creates a new diligence question:

Don't just ask, "Is this deal legal?"

Ask:

"How does this deal fit into everything else the buyer has been acquiring?"

The Buyer’s History Matters

For sellers, this is particularly important.

A business owner considering an offer may focus on valuation, payment terms, earn-outs and closing conditions.

But there is another question worth asking:

Who else does the buyer own?

A $25 million acquisition by a diversified corporation may present relatively little competitive concern.

The same $25 million acquisition by a company that has already purchased six of your closest competitors may look very different.

The seller may not control the regulatory analysis, but understanding the buyer's acquisition strategy can help explain why one buyer may face more closing risk than another.

The Government Is Also Looking at Deal Structure

Companies cannot necessarily evaluate an acquisition by looking only at the headline purchase price.

Related investments, transactions or arrangements may matter.

A recent enforcement action illustrates the point. Regulators alleged that an acquisition that appeared to fall below the applicable HSR threshold had to be considered alongside a related investment, resulting in an alleged reporting violation. The matter ultimately resulted in $12 million in penalties. (ftc.gov)

The broader lesson is straightforward:

Don't design a transaction around a threshold without understanding the rules surrounding related transactions.

Regulatory analysis should happen before the transaction is structured, not after the documents are signed.

What This Means for Dealmakers

For corporate development teams, the implications are practical.

M&A diligence increasingly needs to address more than financial statements and customer concentration.

A sophisticated review may need to examine:

• The buyer's market share

• The target's closest competitors

• Previous acquisitions by the buyer

• The combined company's position after closing

• Related transactions or investments

• Customer and supplier concentration

• Labor-market implications

• Potential regulatory remedies

• The probability and consequences of a government challenge

This does not mean every transaction needs to become a regulatory marathon.

It means regulatory risk should be priced into the deal from the beginning.

The Cost of a Deal Is More Than the Purchase Price

Consider two hypothetical acquisitions.

Deal A: $100 million purchase price, low regulatory risk, straightforward closing.

Deal B: $100 million purchase price, significant regulatory uncertainty, potentially lengthy review and a meaningful possibility of divestitures.

On paper, they cost the same.

In reality, they don't.

Deal B may require additional legal expenses, management time, financing commitments and contractual protections. It may also create uncertainty for employees, customers and investors.

That uncertainty has economic value.

A $100 million deal with a 90% probability of closing is not economically identical to a $100 million deal with a 60% probability of closing.

That is why regulatory risk increasingly belongs in valuation discussions, not merely in the legal department.

Sellers Have a New Question to Ask

For business owners preparing to sell, the traditional questions remain important:

Who will pay the highest price?

Who offers the best terms?

Who is most likely to close?

But there is another:

Who is least likely to create a regulatory problem?

That question can affect the certainty of the transaction.

A slightly lower offer from a buyer with a straightforward regulatory profile could ultimately be more attractive than a higher offer from a buyer whose acquisition strategy could trigger significant scrutiny.

The highest bid is not always the highest-value bid.

The New M&A Reality

The regulatory environment does not mean companies should stop acquiring businesses.

Quite the opposite.

Strategic acquisitions remain one of the fastest ways to expand capabilities and create value.

But the smartest dealmakers are increasingly treating antitrust analysis as an early-stage strategic exercise, not a final legal checkpoint.

The old question was:

"Can we afford this acquisition?"

The modern question is broader:

"Can we afford the acquisition, and can we get it closed?"

That distinction matters.

Because in today's M&A environment, signing the deal is only half the transaction.

The real victory is getting from announcement to closing without the economics, structure or strategic rationale being undermined by regulatory risk.

And for buyers, sellers, boards and investors alike, that may be the defining M&A lesson of 2026:

The best deal is not necessarily the biggest deal.

It is the deal that creates value, survives scrutiny and actually closes.