South Korea is preparing to introduce a new cornerstone investor system for initial public offerings (IPOs), requiring participating institutional investors to hold their allocated shares for staggered periods of six to 10 months. The reform, scheduled to take effect on November 13, 2026, is designed to reduce sharp share-price declines after companies go public and encourage more stable, long-term institutional participation in the country’s IPO market.
The Financial Services Commission (FSC), South Korea’s financial regulator, secured government approval for the detailed rules on November 3. Under the framework, eligible institutions that agree to lock up their shares will receive allocations in advance from the institutional portion of an IPO. The government is introducing the system alongside preliminary book-building reforms, which will allow underwriters to assess institutional demand before a company files its securities registration statement and announces its price range.
Why Is South Korea Changing Its IPO Rules?
South Korea’s IPO market has faced concerns about weak post-listing performance and short-term trading behaviour. In some offerings, investors have rushed to sell shares after listing, putting pressure on prices and damaging confidence in new issues.
The problem has become particularly visible in 2026. According to Bloomberg, companies that listed in South Korea this year were down by a weighted average of approximately 32%, while the benchmark Kospi had gained around 38% over the same period.
The contrast highlights the difficulty faced by investors who participate in IPOs but see their holdings lose value after trading begins.
One example cited in the report was data-centre infrastructure company Elice Inc., whose shares fell 32% on their first trading day. The decline became a signal of the volatility affecting the broader global neocloud business.
South Korean regulators want to address the imbalance between strong demand during IPO subscriptions and selling pressure after shares begin trading. The cornerstone investor framework is intended to bring more committed institutional capital into offerings before listing.
What Is a Cornerstone Investor?
A cornerstone investor is a large institutional investor that agrees to purchase a predetermined allocation of shares in an IPO and hold those shares for a specified period.
Unlike ordinary IPO participants, cornerstone investors receive an allocation in advance in exchange for accepting restrictions on when they can sell their holdings.
The arrangement can provide companies with greater visibility into institutional demand before an IPO is completed. It can also give other investors an indication that certain institutions are willing to maintain exposure beyond the initial listing period.
Hong Kong has an established cornerstone investor model, and South Korea is adapting a similar approach to its domestic market.
The objective is not simply to attract more institutional money. Regulators also want to reduce the concentration of selling immediately after listing and make IPO pricing more closely reflect investor demand.
How South Korea’s New Lockup System Will Work
The new framework divides the shares allocated to each cornerstone investor into three lockup periods.
| Share allocation | Mandatory lockup |
|---|---|
| 50% of allocated shares | 6 months |
| 30% of allocated shares | 8 months |
| 20% of allocated shares | 10 months |
This staggered structure is intended to prevent all allocated shares from becoming available for sale on the same day.
For example, an institution receiving 1 million shares would have 500,000 shares locked for six months, 300,000 shares locked for eight months and the remaining 200,000 shares locked for 10 months.
The phased release could reduce the risk of a sudden wave of selling when restrictions expire. It does not, however, guarantee that investors will retain their shares after the lockups end.
Eligibility Requirements for Cornerstone Investors
South Korea is also introducing financial eligibility conditions to ensure that participating institutions can absorb potential losses during the mandatory holding period.
A cornerstone investor must have equity capital or assets under management worth at least 20 times the value of the IPO shares it intends to subscribe to in advance.
This relative requirement is designed to ensure that institutions have sufficient financial capacity without restricting participation exclusively to the largest investment firms.
The framework also includes allocation limits that vary between South Korea’s two major stock markets.
| Requirement | KOSPI IPOs | KOSDAQ IPOs |
|---|---|---|
| Maximum cornerstone allocation from institutional tranche | 20% | 30% |
| Maximum allocation for one investor | 10% | 20% |
The limits apply to the institutional portion of an IPO, not the entire offering. Retail investors’ allocation is therefore not directly replaced by the cornerstone investor system.
The higher limits for KOSDAQ offerings reflect the regulator’s intention to provide additional incentives for institutional participation in smaller IPOs.
The rules also prohibit agreements with institutions that have relevant conflicts of interest, including major shareholders and affiliated parties. Direct or indirect benefits exchanged as a condition of a cornerstone investor agreement are also prohibited.
South Korea Also Plans to Reform IPO Price Discovery
The cornerstone investor framework is only one part of the broader reform.
South Korea is also introducing a preliminary book-building process, allowing IPO underwriters to gauge institutional demand before a company files its securities registration statement and establishes a formal price range.
Under the system, lead underwriters can share relevant company information with eligible institutional investors after completing due diligence. They can then assess the prices and quantities those investors may be willing to subscribe to.
However, the process will operate under confidentiality agreements because the information may not yet be publicly available.
Eligible institutional participants in preliminary book-building will generally need to have at least 30 billion won in entrusted assets, alongside the required valuation capabilities and internal controls for handling non-public information.
The regulator expects earlier demand assessment to help underwriters establish more reasonable IPO valuations and reduce the risk of offerings being priced without sufficient market feedback.
What Does This Mean for South Korea’s IPO Market?
The reform could change how institutional investors participate in South Korean IPOs.
For companies preparing to go public, securing cornerstone investors may provide greater certainty about institutional demand before the offering is completed. It could also help issuers build confidence among retail investors who are concerned about sharp post-listing declines.
For institutional investors, the system creates an opportunity to secure shares in advance but introduces a significant trade-off: they must accept a lengthy holding period and the risk that market conditions deteriorate before they can sell.
The framework may also influence how IPOs are priced. If underwriters receive more meaningful institutional feedback before setting price ranges, valuations could become more closely aligned with investor expectations.
However, lockups cannot eliminate the risk of overvaluation, weak business fundamentals or disappointing financial performance. A company with poor earnings prospects can still experience a substantial share-price decline even when a portion of its institutional investors cannot sell.
How Does This Compare With India’s Anchor Investor System?
India already has an established institutional allocation mechanism through its anchor investor framework.
Anchor investors participate in IPOs before the public issue opens, helping issuers demonstrate institutional demand. However, India’s rules and South Korea’s new cornerstone framework are not identical.
India’s anchor investor regulations include a shorter mandatory lock-in for a portion of anchor allocations and a longer lock-in for the remainder. South Korea’s new model instead uses a six-, eight- and 10-month staggered structure for cornerstone allocations.
The comparison is relevant because both markets are attempting to balance institutional participation, IPO price discovery and post-listing stability. South Korea’s longer holding periods represent a more explicit attempt to secure medium-term institutional commitment.
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