When-Issued Trading: How SGX Lets You Trade New Shares Before They’re Officially Allotted
When-issued trading is a trading arrangement that lets investors buy and sell shares before they are formally allotted and credited to accounts, commonly used for new shares arising from rights issues, bonus issues, or new listings, settling conditionally until the underlying shares are officially issued.
Not financial advice. All figures for educational reference only. Data as at October 2026.
Last updated: October 2026
Key Takeaways
- When-issued (WI) trading allows shares to be bought and sold on SGX before they are formally issued and credited to CDP accounts, most commonly for new shares from rights issues, bonus issues, or IPOs.
- Trades in the when-issued market are conditional — they only settle normally once the underlying shares are actually allotted; if the issuance is cancelled or delayed, special arrangements apply.
- When-issued trading provides early price discovery for new shares, letting the market establish a trading price before the shares are technically available for delivery.
- The when-issued counter typically trades under a distinct stock code or suffix, separate from the parent company’s main listing, to avoid confusion between the existing and pending shares.
- Once the new shares are formally allotted (typically a few business days after when-issued trading begins), the when-issued counter merges into or is replaced by normal trading in the main counter.
What Is When-Issued Trading?
There’s often a gap of several business days between when a corporate action is approved (a rights issue, bonus issue, or new IPO allotment) and when the actual new shares are formally credited to investors’ CDP accounts. Without a mechanism to trade during this gap, investors who want to buy or sell the new shares immediately would simply have to wait.
When-issued (WI) trading solves this by allowing the new shares to trade on a conditional basis before formal allotment. The shares trade under a separate temporary counter, letting the market establish a price and allowing investors to transact, with the understanding that final settlement is contingent on the shares actually being issued as planned.
This is distinct from the earlier nil-paid rights trading stage in a rights issue (which is trading the entitlement to subscribe) — when-issued trading typically occurs for the new shares themselves, after subscription and payment have been finalised but before the formal share credit is complete, bridging the administrative gap between “paid for” and “officially yours.”
How Does When-Issued Trading Work in Singapore?
SGX and CDP coordinate the when-issued trading window around specific corporate action timelines. For a rights issue, once the subscription period closes and allotment is determined, there’s typically a short window before the new shares are formally credited — when-issued trading can open during part of this window, letting early buyers and sellers transact.
Trades executed during when-issued trading settle normally through CDP once the underlying shares are formally issued, typically within the standard settlement cycle after the shares actually become available. If, for any reason, the underlying corporate action is cancelled, delayed, or materially altered, SGX has specific rules and procedures to unwind or adjust when-issued trades fairly.
The temporary when-issued counter is clearly marked (often with a distinct stock code suffix) so investors don’t confuse it with the company’s existing, already-issued shares trading on the main counter. Once formal allotment completes, the when-issued shares merge into the main listing and the temporary counter ceases to exist.
When-Issued Trading Example
A company completes a rights issue, with the subscription period closing on a Friday. The new shares won’t be formally credited to CDP accounts until the following Thursday, five business days later. Rather than leaving the market frozen for new-share trading during that gap, SGX opens a when-issued counter for the new shares starting the following Monday.
An investor who subscribed to the rights issue and now wants to sell some of the new shares immediately — perhaps to rebalance their portfolio — can do so through the when-issued counter on Monday, even though the shares technically won’t be in their CDP account until Thursday. The trade executes and settles conditionally, completing normally once the formal allotment happens on Thursday as scheduled.
Advantages of When-Issued Trading
Removes an unnecessary waiting period. Investors don’t have to sit idle for days just because of administrative settlement timing — they can act on their investment decisions immediately.
Earlier price discovery. The market gets to establish a trading price for the new shares sooner, which can be useful information for all market participants, not just those directly involved in the corporate action.
Improves overall market liquidity. New shares can begin circulating in the market sooner rather than sitting administratively locked until formal credit, improving capital efficiency.
Clearly separated from main trading. The distinct when-issued counter avoids confusion between pending and already-issued shares, maintaining orderly market operations.
Standard, well-established SGX mechanism. When-issued trading follows established exchange rules, giving investors confidence in the settlement process despite the conditional nature of the trades.
Risks and Limitations
Conditional settlement risk. Although rare, if the underlying corporate action is delayed, cancelled, or altered, when-issued trades may need to be adjusted or unwound, creating temporary uncertainty for involved investors.
Can create confusing dual pricing. During the when-issued window, investors may see two related but distinct prices — the existing shares and the when-issued new shares — which can be confusing for less experienced retail investors.
Lower liquidity than main counter. The temporary when-issued counter typically has lower trading volume than the established main listing, potentially leading to wider bid-ask spreads.
Limited trading window. When-issued trading only operates for a short, specific period around the corporate action, so investors need to be aware of the exact dates to take advantage of it.
Settlement timing mismatch. Investors need to understand that a when-issued trade doesn’t settle immediately like a normal trade — it settles once the underlying shares are formally allotted, which requires patience and awareness of the specific timeline.
When-Issued Trading vs Normal Trading
| Feature | When-Issued Trading | Normal Trading |
|---|---|---|
| Shares formally issued? | Not yet — pending allotment | Yes, already issued and held |
| Settlement | Conditional, completes upon formal allotment | Standard T+2 settlement cycle |
| Trading counter | Separate, temporary counter/code | Main company counter |
| Typical duration | Short window around a corporate action | Ongoing, continuous |
| Liquidity | Generally lower | Generally higher, established |
Source: SGX corporate action and trading mechanics, October 2026.
The Bottom Line
When-issued trading bridges the administrative gap between a corporate action being finalised and new shares being formally credited, letting investors act on their positions without waiting. It’s a useful liquidity tool, but investors should understand the conditional settlement nature and watch for the specific trading window dates around any rights issue, bonus issue, or new listing.
Frequently Asked Questions
Why can't new shares just be traded normally right away?
There’s usually an administrative processing gap between a corporate action’s finalisation (like a rights issue subscription closing) and the formal crediting of new shares to CDP accounts. When-issued trading fills this gap.
Is when-issued trading risky compared to normal trading?
It carries a small additional layer of conditional settlement risk, since the trade only finalises once the underlying shares are formally allotted, but this is rare to cause real problems given SGX’s established procedures.
How do I know when a stock has when-issued trading available?
SGX and the relevant company will announce the specific when-issued trading dates as part of the corporate action timetable, typically published alongside the rights issue, bonus issue, or new listing announcement.
Does when-issued trading apply to IPOs too?
Yes, when-issued trading can apply to newly listed companies in the period between the IPO allotment being finalised and the official first day of trading, in some market structures, though mechanics vary by jurisdiction and specific listing.
What happens to my when-issued trade if the rights issue is cancelled?
SGX has specific rules to unwind or adjust affected trades fairly if an underlying corporate action is cancelled or materially changed, though this is an uncommon occurrence.
