M&A Stories
February 16, 2026
A $12.6 Million Lesson in Post-Closing Price Adjustments
ArchKey Intermediate Holdings Inc. v. Mona (Delaware Court of Chancery, 2023)
Vincent “Cap” Mona spent his career building Mona Electric Group from one used truck in 1966 into a major electrical contractor. He’d never sold a company before.
In 2019, a buyer backed by Oaktree Capital offered to buy his company as part of a rollup strategy. After negotiations, they agreed on a $21 million price. But during due diligence, the buyer found a $4 million error in how Mona’s team estimated profits on a hospital construction contract. The buyer threatened to walk.
To save the deal, the buyer proposed closing at $21 million but then preparing updated financial statements one year later to adjust the final price up or down based on actual numbers. The buyer’s CFO showed Mona examples of how this would work. The examples depicted small adjustments ranging from $25,000 to $300,000.
Mona agreed. They closed in February 2020.
The Shock
Right after closing, the buyer fired Mona’s CFO, pushed aside six top managers, and fired 30 office employees. The buyer cut the CEO out of operations and ignored Mona’s requests for updates.
In December 2020, the buyer delivered the adjusted financial statement claiming the real purchase price should be $8.375 million. Mona now owed the buyer $12.6 million, representing nearly two-thirds of what they’d paid him.
The Evidence
Mona wasn’t just upset about the money. He had evidence suggesting manipulation. The buyer had quietly settled the troubled hospital contract without telling Mona and without including the settlement in price adjustments. When Oaktree sold the buyer to another private equity firm during this same period, they reported Mona’s company had an enterprise value of $31 million and EBITDA of $6.7 million. Yet they told Mona it was worth only $8 million.
The buyer had also fired the CFO and 30 finance employees who knew the company’s historical accounting practices and could verify whether the buyer’s numbers were accurate. The buyer controlled all financial records and ignored Mona’s requests for documentation.
Mona believed the buyer had manufactured numbers to justify slashing the price.
The Legal Fight That Should Never Have Happened
The contract said disputes over the price adjustment would be decided by an Independent Accountant who shall act as an arbitrator.
The buyer filed suit asking the court to compel arbitration, meaning send everything to the accounting firm. Mona fought back, arguing this wasn’t arbitration but rather an expert determination. The distinction mattered enormously.
If the court ruled this was arbitration, then under arbitration law all disputes go to the arbitrator, including sophisticated legal claims. A CPA firm, not the Delaware Court of Chancery, would decide whether the buyer breached the implied covenant of good faith and fair dealing. There would be no full discovery of emails and internal documents. No expert witnesses on valuation. Limited review with the accountant’s decision nearly impossible to appeal. An accounting firm would be applying Delaware contract law doctrines they’re not trained in.
The seller’s strongest claims about fraud and bad faith would be decided by people with accounting expertise, not legal expertise.
The Outcome
Mona won the labeling fight. The court agreed it was expert determination, not arbitration. But even after winning, the court still sent the good faith issue to the accounting firm, reasoning that accountants can determine if accounting choices were so extreme as to show lack of good faith.
The court did preserve Mona’s implied covenant claim for itself to decide later, but only after the accountant makes its determinations first.
Mona got lucky. The court could easily have ruled the other way and sent everything to the accountant.
The Pre-Closing Mistake
Why did this fight happen at all? Because the contract used one word: arbitrator.
This created ambiguity about whether this was arbitration or expert determination, months of expensive litigation, risk that fraud and bad faith claims would be decided by accountants instead of judges, and a fight Mona never should have had to fight.
What Should Have Been Done
The contract should have clearly stated the Independent Accountant acts as an expert determination, not as an arbitrator or arbitration. It should have specified the accountant determines only whether the accounting methodologies comply with GAAP and past practices. It should have explicitly stated that claims for breach of contract, breach of implied covenant, fraud, or other legal claims get resolved exclusively by a court.
No ambiguity. No fight. Legal claims automatically stay in court where they belong.
Why This Matters
This was a $21 million deal for an established electrical contractor. The seller was ethical, had good business judgment, built a successful company over decades, and was represented by counsel. But he got trapped because he’d never sold a company before, didn’t understand how post-closing adjustments could be weaponized, and his contract used ambiguous language.
The Critical Questions
When reviewing post-closing price adjustment provisions, focus on these issues. Does the contract label the process as expert determination rather than arbitration? Does it clearly define what the accountant decides versus what the court decides? Does it explicitly preserve legal claims for court? Are there protections against manipulation like requiring the seller to retain access to financial records, requiring key finance personnel to be retained through the adjustment period, capping how much the price can be adjusted, and requiring the buyer to provide documentation?
The Bigger Picture
Post-closing adjustments aren’t inherently bad. They’re useful when there’s genuine uncertainty, both sides want to close quickly, and the mechanism is clearly defined and fairly structured.
They become dangerous when the buyer controls all information after closing, the contract is ambiguous about who decides what, the seller can’t verify numbers, legal claims might be decided by accounting experts instead of courts, and there are no caps or limits.
Mona thought he was agreeing to minor adjustments based on examples showing $25,000 to $300,000. He faced a $12.6 million reduction. And because the contract said arbitrator instead of expert determination, he spent months fighting about whether a CPA firm or the Delaware Court of Chancery would decide if the buyer committed fraud.
The Bottom Line
Don’t let buyers slip arbitrator language into your accountant true-up provision. You’re potentially deciding whether a CPA or a judge interprets your contract, whether you get full discovery or just written presentations, whether you can prove fraud or just argue about accounting standards, and whether legal claims get decided by accounting experts or courts with specialized expertise.
The fix is simple. Insist on expert determination language and explicitly reserve legal claims for court. The time to fix it is before you sign, not after you discover the buyer slashed your price by $12 million.
Before closing, you can negotiate these terms. After closing, you’re fighting from weakness. The sophisticated buyers and their PE backers already know these games. Sellers and their advisors need to know them too.
Case: ArchKey Intermediate Holdings Inc. v. Mona, 302 A.3d 975 (Del. Ch. 2023)
Thank you for reading this blog. If you have any questions, insights, or if you’d like to engage in a more detailed discussion on this matter, I invite you to reach out directly.
Feel free to send me an email. I value thoughtful discussions and am always open to connecting with business owners, management, as well as professionals who share an interest in the complexities of M&A law in lower middle market private target deals.
By John McCauley: I write about recent problems of buyers and sellers in lower middle market private target deals.
Email: jmccauley@mk-law.com
Profile: http://www.martindale.com/John-B-McCauley/176725-lawyer.htm
Telephone: 714 273-6291
Check out my books: Buying Established Business Assets: A Guide for Owners, https://www.amazon.com/dp/B09TJQ5CL5
and Advisors and Selling Established Business Assets: A Guide for Owners and Advisors, https://www.amazon.com/dp/B0BPTLZNRM
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