A foreign buyer signs a share purchase agreement for a Korean technology company. The seller promises that the target's financial statements are accurate, no major customer has threatened to leave, and the business will be run in the ordinary course until closing. The deal closes, integration begins, and six months later the buyer finds delayed revenue recognition, undisclosed regulatory correspondence, and a working-capital calculation that does not match the model used for pricing.

This is the setting for many Korea M&A disputes in 2026. As Korean deal activity recovers and foreign investors return to strategic sectors such as AI, semiconductors, battery materials, cosmetics, healthcare, defense, and digital services, more post-closing disagreements are moving from negotiation to formal claims. The disputes are not only about whether a deal should have been done; they are about price adjustments, earn-outs, representations and warranties, indemnity caps, fraud theories, and urgent relief when one side believes the other is changing the economics of the transaction.

For foreign buyers, sellers, private equity funds, and corporate development teams, Korea is familiar in some ways and different in others. Share purchase agreements may look similar to US or UK-style documents, but Korean courts and arbitral tribunals apply Korean statutory rules, Korean evidence practice, and Korean concepts such as good faith, causation, foreseeability of damages, and reduction of excessive liquidated damages. Understanding these points before a dispute begins can materially affect leverage.

Why Korea M&A Disputes Are Increasing in 2026

The first driver is the structure of recent Korean deals. More transactions involve carve-outs, founder exits, distressed assets, minority investments with governance rights, and cross-border acquisitions where closing occurs before all integration risks are visible. These deals are fertile ground for Korea M&A disputes because the parties often rely on complex pricing formulas, special indemnities, accounting schedules, and post-closing cooperation covenants.

A carve-out is a simple example. A Korean conglomerate may sell a non-core business that previously shared employees, IT systems, supply contracts, trademarks, or back-office functions with the seller group. The buyer may price the business based on assumptions about standalone costs. After closing, disputes can arise over whether the seller delivered the business promised, whether transition services were adequate, and whether hidden liabilities should reduce the final purchase price.

The second driver is a more assertive approach to post-closing review. Buyers are increasingly willing to investigate compliance, tax, employment, data privacy, and accounting issues after closing. If the target misses projections, the buyer may scrutinize the data room, management presentations, disclosure schedules, board minutes, and emails to identify warranty breaches or pre-closing covenant breaches.

The third driver is the growing use of arbitration and expert determination in cross-border Korean transactions. Many foreign investors prefer arbitration because it offers a neutral forum and easier cross-border enforcement under the New York Convention. At the same time, accounting disputes are often assigned to an independent expert, while broader contractual disputes go to court or arbitration. If the drafting is not precise, the parties may fight first about where the dispute should be heard before reaching the merits.

Korea M&A Disputes Over Earn-Outs and Price Adjustments

Earn-outs are attractive when the seller believes the business will grow and the buyer is unwilling to pay the full value upfront. In Korea, they are increasingly common in founder-led technology, healthcare, platform, and consumer-brand deals. The basic bargain is simple: the seller receives additional consideration if the target reaches revenue, EBITDA, regulatory, customer, or product milestones after closing.

The litigation risk is also simple. After closing, the buyer controls the business. The seller may later argue that the buyer deliberately reduced marketing spend, changed accounting treatment, shifted revenue to another affiliate, delayed product launches, or failed to pursue customers in order to avoid the earn-out. The buyer may respond that it acted in the ordinary course of business and made commercially reasonable decisions in response to market conditions.

Under Korean law, sellers often invoke Article 2 of the Civil Act, which requires rights to be exercised and duties performed in accordance with the principle of trust and good faith. This is sometimes compared to the implied covenant of good faith and fair dealing in US contract law, but the Korean analysis is not identical. Korean courts and tribunals generally examine the contract language, the parties' allocation of business discretion, the purpose of the earn-out, and whether the buyer's conduct was specifically aimed at frustrating the seller's contingent payment.

A seller should not assume that a bad business outcome automatically proves bad faith. If the buyer can show ordinary-course business reasons, such as loss-making customer contracts, supply-chain disruption, regulatory delay, or a documented board decision to reduce unprofitable sales, the seller's claim becomes harder. For that reason, earn-out clauses should define the operating covenants with precision. Terms such as "commercially reasonable efforts," "ordinary course," and "consistent with past practice" should be tied to concrete examples, reporting obligations, and approval rights.

Price-adjustment disputes are different but equally common. A closing-account mechanism may adjust the purchase price based on net debt, cash, working capital, or other metrics. The parties may agree that an accounting firm will make a final determination if they cannot agree. Problems arise when the dispute includes both accounting issues and legal issues, such as whether a liability was properly disclosed, whether a receivable was collectible, or whether an accounting policy was manipulated before closing.

Foreign investors should separate these tracks at the drafting stage. Pure calculation disputes can go to expert determination. Claims for breach of representation, covenant, fraud, or indemnity should remain with the court or arbitral tribunal unless the parties intentionally want the expert to decide legal questions. The dispute-resolution clause should also state whether the expert acts as an expert or arbitrator, whether reasons must be given, what information can be requested, and whether the determination is final except for manifest error.

Warranty Claims in Korea M&A Disputes: What Buyers Must Prove

Representations and warranties are the center of many Korea M&A disputes. The most frequently contested warranties involve financial statements, taxes, compliance with law, material contracts, employment liabilities, intellectual property, data protection, licenses, litigation, related-party transactions, and absence of material adverse change. A buyer's claim usually starts with a gap between what the seller promised and what the buyer later discovered.

The legal foundation depends on the contract and governing law. If Korean law governs, a breach of contractual obligation may support a damages claim under Article 390 of the Civil Act, which provides for damages where an obligor fails to perform in accordance with the substance of the obligation. The buyer must still establish breach, causation, and recoverable loss. The buyer should also consider Article 393 of the Civil Act, which limits ordinary damages to those caused by non-performance and allows special damages only where the circumstances were known or foreseeable.

This matters in post-closing M&A claims because buyers often seek more than the direct cost of fixing the problem. They may claim diminution in value, lost business opportunities, regulatory exposure, integration costs, or financing consequences. Korean courts and tribunals will examine whether those categories were sufficiently connected to the breach and whether they were foreseeable at the time of contracting.

For example, assume a foreign buyer purchases a Korean medical-device distributor. The seller represents that all required approvals are valid and that there is no pending regulatory investigation. After closing, the buyer learns that a key product approval was at risk because of pre-closing conduct. Direct costs to address the approval problem may be easier to claim than speculative lost profits from a future expansion plan that was never shared with the seller.

Evidence is critical. The buyer should preserve due-diligence reports, Q&A logs, disclosure schedules, financial models, management presentations, emails, board materials, accounting workpapers, and integration records. Korea does not have US-style discovery, so a party should not expect broad automatic access to the other side's internal documents. Korean civil procedure allows targeted evidence mechanisms, but the requesting party must be prepared to identify the documents and explain their relevance.

Sellers, on the other hand, should build the record before signing and closing. Disclosure schedules should be specific, not generic. If a risk was disclosed in the data room, the seller should ensure the contract clearly states whether data-room disclosure qualifies the warranties. If management projections are not guarantees, the agreement should say so. If the seller's liability is capped, time-limited, or subject to a deductible or de minimis threshold, those limitations should be drafted in clear language.

Civil Act Articles That Shape Damages and Deal Leverage

Several Civil Act provisions frequently affect Korean M&A litigation strategy. Article 390 is the starting point for damages based on non-performance. It is broad, but it does not eliminate the need to prove a contractual breach and the amount of loss.

Article 393 is especially important for foreign investors used to expansive damages theories. It distinguishes ordinary damages from special damages. If a buyer wants to recover losses tied to a financing structure, a resale plan, a downstream customer commitment, or a parent-company strategy, the buyer should make sure those circumstances are documented and foreseeable to the seller.

Article 398 of the Civil Act governs damages determined in advance, often translated as liquidated damages. Under Article 398(2), a court may reduce an agreed amount if it is unduly excessive. This can affect break-up fees, deposit forfeiture, reverse termination fees, and contractual penalties in failed Korean transactions. A clause that looks commercially negotiated is helpful, but not always conclusive if the amount appears punitive compared with expected harm.

Article 2 of the Civil Act, the good-faith principle, appears in earn-out, cooperation, closing-condition, and information-access disputes. It can support an argument that a party should not abuse contractual discretion. But it is not a substitute for careful drafting. A party relying only on general good faith may face a difficult evidentiary burden, particularly where the contract gave the other side broad operational discretion.

Korean law also recognizes tort claims in appropriate circumstances. For fraudulent inducement or intentional concealment, a claimant may look to Article 750 of the Civil Act, which provides liability for damages caused by an unlawful act committed intentionally or negligently. In M&A disputes, fraud theories can be attractive because they may bypass some contractual limitations. They are also harder to prove. A claimant must establish more than an inaccurate statement; it must show deception, reliance, causation, and loss.

Litigation, Arbitration, and Interim Relief in Korean Deal Disputes

Forum choice should be treated as a commercial term, not boilerplate. Domestic Korean M&A disputes often proceed in Korean courts. Cross-border M&A disputes often use international arbitration, particularly under KCAB International, ICC, SIAC, or other institutional rules. Arbitration may be attractive where the parties want English-language proceedings, confidentiality, sector-specialist arbitrators, and enforceability outside Korea.

Korean court litigation has its own advantages. It may be faster and more direct for claims involving Korean defendants, Korean assets, provisional attachment, injunctions, or corporate-register issues. If a buyer needs to freeze receivables, shares, bank accounts, or real estate in Korea, court-based interim measures may be essential.

Interim relief can matter before and after closing. A party may seek to prevent a shareholder meeting, block a share issuance, preserve documents, restrain misuse of confidential information, or secure assets for a damages claim. In Korea, provisional attachment and preliminary injunction tools can be powerful, but they require careful preparation and often security. The applicant must present a credible underlying claim and a need for urgent preservation.

Parties should also coordinate dispute clauses across related documents. A share purchase agreement, shareholders' agreement, transition services agreement, escrow agreement, and employment or non-compete agreement may point to different forums if drafted separately. That creates procedural friction. For foreign investors, the better approach is to map all likely disputes and decide which forum should handle each category.

Practical Tips for Foreign Buyers and Sellers

Foreign buyers should focus on evidence, remedies, and timing before signing. The following steps usually create better leverage if a dispute later arises:

Define the primary keyword of the claim internally: warranty breach, price adjustment, earn-out manipulation, covenant breach, fraud, or indemnity release.
Require detailed disclosure schedules for tax, employment, data privacy, regulatory, IP, customer, and related-party matters.
Draft earn-out covenants with operational detail, not broad aspirations.
Separate accounting expert determination from legal claims unless the parties clearly intend one forum to decide both.
Preserve due-diligence Q&A, data-room indexes, management presentations, and internal approval materials.
Include document-access rights after closing for accounting, tax, regulatory, and indemnity claims.
Consider escrow, holdback, guarantee, or security arrangements if the seller may have limited assets after closing.
Align dispute-resolution clauses across the purchase agreement and ancillary documents.

Foreign sellers should take the opposite side of the same risk map:

Avoid warranties that are broader than the due-diligence materials actually support.
State whether buyer knowledge, data-room disclosure, or specific disclosure schedules qualify the warranties.
Limit liability by survival period, cap, basket, deductible, and excluded damages where commercially appropriate.
Clarify whether forecasts, budgets, and business plans are information only or contractual commitments.
Keep contemporaneous records showing that disclosures were made and questions were answered.
If an earn-out is included, negotiate information rights but also preserve buyer operational flexibility.
Make fraud carve-outs precise rather than open-ended.
Confirm whether Korean law, foreign law, Korean courts, or arbitration best matches the enforcement strategy.

Key Takeaways

Korea M&A disputes are increasingly focused on post-closing economics: earn-outs, closing accounts, indemnities, and warranty breaches.
Korean Civil Act Articles 2, 390, 393, 398, and 750 often shape the analysis of good faith, damages, liquidated damages, and fraud.
A buyer must prove breach, causation, and recoverable loss; a disappointing investment result is not enough.
A seller should not rely on informal disclosure. Specific disclosure schedules and clear liability limitations matter.
Expert determination is useful for accounting calculations but can create procedural fights if legal issues are mixed in.
Arbitration may suit cross-border deals, while Korean courts may be better for urgent asset preservation or corporate-law relief.
Early evidence preservation is essential because Korean litigation does not provide US-style discovery.

Conclusion

Korea remains an attractive market for foreign strategic buyers, private equity sponsors, and institutional investors, but stronger deal flow also means more post-closing conflict. The best time to prepare for Korea M&A disputes is before signing, when the parties can still allocate risk clearly, choose the right forum, and build practical remedies into the documents.

If a dispute has already emerged, speed matters. The first weeks often determine whether the claimant preserves the right evidence, chooses the correct forum, and secures assets or documents before leverage disappears. Korea Business Hub assists foreign investors and companies with Korean litigation, arbitration strategy, shareholder remedies, corporate governance issues, and related company-setup or regulatory matters that often sit behind M&A disputes.

Korea M&A Disputes: Earn-Out and Warranty Claims in 2026