Korea Replaces Its Merger Formula With Board Judgment. Investors Get Disclosure, Not a Price Rule.

South Korea will replace its prescribed merger-price formulas with a fair-value standard on December 9. Listed companies will have to consider share price, asset value and earnings value when setting terms for mergers and other major reorganizations.

The arithmetic is disappearing. The discretion is not.

The revised Financial Investment Services and Capital Markets Act was promulgated on September 8. It covers mergers, significant business or asset transfers, comprehensive share exchanges or transfers, and divisions or split mergers. Boards must explain the transaction's purpose, expected effect and price. An external appraiser must assess the transaction.

The law is final. The implementation detail is not. The Financial Services Commission published draft subordinate rules on September 16, with comments open through October 6. Those drafts remove the old calculations and expand disclosure, but they do not prescribe how much weight each valuation input should receive.

That is the control test. Korea is trading a visible formula for disclosed judgment. Minority investors gain more information. They do not gain a guaranteed price.

Problem: the formula made timing part of the deal

For listed-company mergers subject to the old rule, the benchmark price used three observations: the one-month volume-weighted average close, the one-week volume-weighted average close and the latest closing price before the earlier of the board resolution or contract date. The arithmetic mean became the reference market price. The rule permitted a 10% discount or premium in ordinary cases.

Dissenting shareholders faced a related calculation. If they and the company could not agree on a purchase price, the rule averaged the two-month, one-month and one-week volume-weighted prices before the board resolution.

The formulas reduced one kind of argument. Anyone could reproduce the arithmetic. They also made the choice of measurement date unusually valuable. A controlling shareholder could benefit if the listed target entered the lookback window with a depressed price.

The Samsung C&T appraisal litigation shows the size of that timing risk without pretending to predict the new regime. Samsung C&T offered dissenters 57,234 won a share under the statutory calculation. An appellate court moved the reference date back to December 17, 2014, before the merger expectation could distort the price, and set the amount at 66,602 won. The Supreme Court upheld that result.

The difference was 9,368 won, or 16.4%. Both figures came from market-price arithmetic. The material change was the date.

That is not a fair-value counterfactual. It is narrower and more useful. It proves that a mechanical rule can be reproducible while its timing remains contestable.

Analysis: fair value moves the dispute into assumptions

The new statute requires a fair value that considers market price, asset value, earnings value and other factors. It provides no hierarchy or weighting. The draft Enforcement Decree deletes the old formulas rather than replacing them with a new equation.

The companion draft disclosure regulation tries to make that freedom auditable. A board opinion must describe any fairness measures, such as a special committee. The securities filing and material-event report must carry the opinion and the external assessment.

The appraiser must address the price, the exchange ratio or other deal terms, the valuation method, the reasonableness of forecasts and business-plan assumptions, and any unusual difficulty or limitation encountered. For affiliate transactions, the filing must also expose investments, debt guarantees, overlapping executives and changes in shareholdings involving related parties.

Those requirements are stronger than a bare fairness conclusion. They force the valuation model's moving parts into public view.

Independence is less complete. In affiliate transactions, the enacted law says the statutory auditor or audit committee selects the external appraiser. The draft requires the selection document to be filed. Existing rules also bar firms with specified relationships to the companies, require conflict controls and allow the FSC to restrict deficient appraisers from evaluation work for up to three years. The 2024 reform already stopped an adviser that helped set a company's merger price from evaluating the same price.

Neither the statute nor the September drafts specify who must bear the appraisal fee or impose a fee structure insulated from management. They also do not create a numerical test for an unreasonable discount rate, terminal growth rate or earnings forecast. The appraiser tests judgment using another layer of judgment.

That does not make the review empty. It makes appointment records, scope, assumptions and sensitivity analysis more important than the word "fair" on the cover.

Implications: investors need evidence of changed value

The reform should weaken the incentive to choose a transaction date solely for a low trailing share price. A board can no longer point to one mandatory formula as a complete answer.

It creates a different risk. A discounted-cash-flow model can move materially with small changes to the forecast period, discount rate or terminal value. Asset values can depend on which assets are reappraised and which remain at book value. Market prices can still receive decisive weight even when other inputs appear in the report.

The first useful test is not whether filings become longer. It is whether valuations become contestable before shareholders vote.

Investors should look for a bridge from each method to the final price, sensitivity ranges for material assumptions, the audit committee's selection record and an explanation of rejected alternatives. A fairness committee that met twice and accepted management's model is a procedure, not a constraint.

Courts remain the backstop for dissenters who cannot agree with the company. The Supreme Court has said judges may investigate fair price independently and choose another reference period, but evidence must be reliable and highly probable. It has also warned that a gap between market price and an income or asset valuation does not by itself prove that the market price is wrong.

Evidence that the reform changed outcomes will take several transactions. The clean measures are the spread between initial terms and appraised value, changes after regulator correction requests, revisions following shareholder challenge, and court awards relative to the company's offer. Those results should be compared with method and assumptions, not just deal size.

Korea has removed a formula that could turn market timing into transaction value. Its replacement can protect minority investors only if disclosed judgment becomes challengeable judgment. More pages are certain. Better prices are still an empirical question.