IPO Lock-Up Period Singapore
Why Early Investors Often Cannot Sell for Months After a Listing
An IPO lock-up period is a contractually or regulatorily imposed restriction that prevents pre-IPO shareholders — including company founders, management, private equity investors, and cornerstone investors — from selling their shares on the open market for a specified period, typically six to twelve months, after a company’s SGX listing.
Not financial advice. All figures for educational reference only. Data as at September 2026.
Key Takeaways
- Lock-up periods on SGX listings typically run six to twelve months, though the exact length and which shareholders are covered varies by IPO and is disclosed in the prospectus.
- Cornerstone investors — who commit to buying a fixed allocation before the IPO price is even set — are almost always subject to lock-up terms as part of their cornerstone agreement.
- Lock-ups exist to prevent an immediate flood of selling from insiders right after listing, which could otherwise crash the share price before public investors have a chance to establish a fair market.
- When a lock-up expires, the share price can face downward pressure if a large proportion of previously-locked shares are sold at once — informally known as a ‘lock-up expiry overhang’.
- Retail investors who bought shares through the public tranche are not subject to lock-up restrictions — the rule applies specifically to insiders and cornerstone/placement investors, not ordinary IPO applicants.
- SGX itself does not mandate a single universal lock-up length across all listings, leaving the specific term to be negotiated between the company, its underwriters, and cornerstone investors deal by deal.
Table of Contents
What Is IPO Lock-Up Period?
How Does It Work in Singapore?
IPO Lock-Up Period Example
Advantages
Risks and Limitations
Who Is Typically Subject to an SGX IPO Lock-Up
The Bottom Line
What Is IPO Lock-Up Period?
When a company lists on SGX, its prospectus discloses which existing shareholders — typically the founders, controlling shareholders, pre-IPO private equity or venture investors, and cornerstone investors who subscribed to a pre-arranged allocation — are bound by lock-up undertakings, and for how long. These undertakings are contractual commitments given to the issue manager and underwriters as part of the IPO process, designed to signal confidence in the listing and protect the newly public share price from an immediate insider sell-off.
Lock-up terms are not uniform across all SGX IPOs. Some deals impose a full lock-up on 100% of pre-IPO shares for the entire period; others use a tiered structure where a portion unlocks earlier (say, at 6 months) and the remainder later (at 12 months). The specific structure is disclosed in the prospectus’s ‘Moratorium’ or ‘Lock-Up’ section.
Prospective IPO investors evaluating an upcoming listing should read the ‘Moratorium’ section of the prospectus closely rather than relying on media summaries, since the precise percentage of shares locked up, the exact duration, and any tiered release schedule can materially affect how much genuine free float will actually be available for price discovery in the company’s early trading history — a detail that matters more for smaller, less liquid listings than for large-cap Mainboard debuts with naturally broader institutional ownership.
How Does It Work in Singapore?
Cornerstone investors — usually institutional investors, family offices, or strategic partners who commit to a fixed allocation at the IPO price before the final price is set — are almost universally subject to lock-up terms, since their participation is meant to demonstrate confidence in the listing rather than provide quick-flip liquidity. Their lock-up is a condition of the cornerstone subscription agreement, separate from and often stricter than the general moratorium applied to founders and controlling shareholders.
Once the lock-up period ends, previously restricted shareholders are free to sell on the open market without further restriction (subject to standard insider-trading and disclosure rules if they remain substantial shareholders or directors). The market often anticipates this ‘lock-up expiry’ date in advance, and share prices can see selling pressure in the days or weeks around expiry if investors expect insiders to sell a meaningful portion of their holdings.
Some SGX IPOs also include lock-up extensions or ‘lock-up plus’ arrangements where controlling shareholders voluntarily commit to an even longer restriction than the underwriters require, often as a deliberate signal to the market of long-term commitment beyond the regulatory or contractual minimum — this is disclosed in the same prospectus section and can be a useful, if imperfect, indicator of insider confidence relative to peer listings with only the standard lock-up term.
IPO Lock-Up Period Example
A company lists on the SGX Mainboard with founders holding 40% of shares post-IPO and two cornerstone investors holding a combined 15%, both subject to a 12-month lock-up per the prospectus. For the first year after listing, these 55% of total shares are effectively removed from the tradable float, meaning the company’s real free float for price-discovery purposes is much smaller than its total share count suggests. As the 12-month anniversary approaches, market commentary often begins discussing whether the founders or cornerstone investors are likely to sell once the lock-up lifts, which can itself influence trading in the weeks leading up to expiry.
Some retail investors specifically track upcoming lock-up expiry dates for companies they hold, treating the date as a calendar risk factor similar to an earnings announcement, and may choose to reduce position size or hedge exposure in the weeks leading up to a large expiry if the locked-up proportion of shares is unusually high relative to the company’s total float.
Advantages
- Lock-ups protect new public shareholders from an immediate insider sell-off that could otherwise crater the share price before the market has had time to establish a fair valuation.
- Cornerstone lock-ups signal genuine long-term confidence rather than a quick post-IPO exit, which can be a reassuring factor for retail investors assessing an IPO’s credibility.
- Disclosed lock-up schedules give investors visibility into exactly when a potential increase in tradable supply might occur, allowing more informed timing of entry or exit decisions.
- Lock-up disclosures are a matter of public record in the prospectus, filed with and reviewed by SGX and MAS as part of the listing approval process, giving investors a reliable, regulator-reviewed source rather than having to rely on secondary reporting.
Risks and Limitations
- Lock-up expiry can trigger a real share price decline if a meaningful proportion of previously restricted shares are sold once free to trade, particularly for smaller-float companies where the locked-up shares represent a large percentage of the total.
- The true free float of a newly listed company is smaller than headline figures suggest during the lock-up period, which can make the stock more volatile on lower actual trading liquidity than the total share count implies.
- Not all lock-ups are equally strict — some allow limited sales for specific purposes (e.g. estate planning transfers) even during the restricted period, so investors should read the actual prospectus terms rather than assume a blanket restriction.
- Retail investors sometimes confuse lock-up expiry with a fundamental change in the company, reacting to price weakness around expiry dates without distinguishing supply-driven selling from a genuine shift in business outlook.
- A lock-up expiry can coincide with unrelated broader market weakness, making it genuinely difficult in hindsight to separate how much of any price decline around that date was due to lock-up-driven selling versus other, unconnected market factors.
Who Is Typically Subject to an SGX IPO Lock-Up
| Shareholder Type | Usually Locked Up? | Typical Duration |
|---|---|---|
| Founders / controlling shareholders | Yes | 6–12 months, sometimes tiered |
| Cornerstone investors | Yes, as a condition of subscription | 6–12 months per subscription agreement |
| Pre-IPO private equity/venture investors | Yes, usually | 6–12 months |
| Placement tranche investors (institutional, non-cornerstone) | Sometimes, deal-specific | Varies, often shorter or none |
| Public tranche retail investors (IPO ballot applicants) | No | Not applicable |
The Bottom Line
For Singapore IPO investors, the lock-up period is a structural feature worth checking in every prospectus — it shapes the real tradable float in a stock’s early life and creates a predictable date around which supply-driven price pressure can emerge, independent of the underlying business’s actual performance Reading the moratorium disclosure alongside the company’s free-float and shareholder concentration figures gives a fuller picture than looking at any single metric in isolation..