Editor’s note: This is general educational information about how applications in a New Zealand initial public offering are scaled when demand exceeds supply. It is not investment advice and does not describe any current offer. The mechanics and figures come from the official offer documents and exchange guidance listed at the end.
Oversubscription is not a compliment paid to a company. It is an arithmetic problem for whoever is selling the shares, and the way that problem is solved decides which applicants get a full allocation, which get cut, and which end up with a parcel below the thousand dollar Minimum Holding. In New Zealand the answers are written down in advance, in the offer document, and they are more specific than most applicants expect.
Applying for dollars, not shares
The first thing to understand is that a retail applicant in a New Zealand offer usually does not apply for a number of shares. The Mighty River Power offer document is explicit: applicants applied and paid for a dollar amount of shares rather than a specific number, with a minimum application of $1,000 and multiples of $100 after that, and no applicant was required to pay more than the dollar amount applied for.
The conversion happens afterwards. Once the Final Price was determined, the application amount was divided by the Final Price to calculate the number of shares applied for, rounded down to the nearest whole share. Any difference between the dollar amount applied for and the value of the shares received, arising solely from that rounding, was retained by the Crown.
That structure matters for scaling, because it means the seller is scaling a dollar figure, not a share count, and the share count is only fixed at the end.
What scaling actually did in a real offer
The Mighty River Power document set out the priority rules before applications opened. Applications up to $2,000 would not be scaled. Applications above $2,000 would not receive less than $2,000 worth of shares. If the offer was oversubscribed and scaling was required, New Zealand applicants who had pre-registered and then applied in the General Offer would receive an amount of shares up to twenty five per cent higher than a New Zealand applicant who applied for the same amount but had not pre-registered. That pre-registration benefit did not apply to the first $2,000 worth of shares, which was guaranteed either way, and no applicant would receive more shares than they applied for. The document added the caveat that in the event of significant over-subscription it might not be possible to allocate pre-registrants the full twenty five per cent benefit.
The discretion sat with the seller. Allocations between the General Offer and the Institutional Offer would be determined by the Crown in consultation with its advisers and the company, following the close of the Institutional Offer. Scaling in the General Offer would be determined the same way and, in the document’s own words, may not be pro rata.
Institutional applicants were scaled on different criteria again. If the Institutional Offer was oversubscribed, allocations would be influenced by whether the participant was a New Zealand institution managing significant investments on behalf of New Zealanders including KiwiSaver or superannuation, or a participant representing collective interests in New Zealand such as Maori trusts, the price and number of shares bid for, the timeliness of the bid, and any other factors the Crown considered appropriate. Price and size were two inputs among several, not the whole test.
Refunds were mechanical. Where an application was scaled and the difference between the value of the shares received and the amount paid exceeded the Final Price, the difference was refunded no later than five business days after the Allotment Date, without interest.
The listing requirement that shapes the allocation
Scaling is not only about fairness between applicants. It is also how an issuer arrives at a shareholder register that NZX will quote.
NZX’s Spread guidance note explains the test. Spread refers to how ownership is distributed among holders, and NZX generally will not quote a class of equity securities unless the spread requirements are met. Those requirements are an eligibility requirement for listing, not an ongoing obligation. An applicant can satisfy them by ensuring NZX is satisfied that on quotation at least twenty per cent of the securities on issue will be held by at least 100 Non-Affiliated Holders each holding, or having a beneficial interest in, at least a Minimum Holding. That is the free float criteria. Alternatively the applicant can demonstrate an appropriate spread of holders to ensure a sufficiently liquid market.
A Non-Affiliated Holder is any person other than one who holds, or is one of a group of associated persons who together hold, ten per cent or more of a class, or who has the power to appoint one or more directors, or whom NZX in its discretion declares not to be a Non-Affiliated Holder. As at the date of the guidance note, NZX had not made any such declaration. A Minimum Holding is a holding with a value of at least $1,000, calculated prior to quotation at the issue or sale price in the offer document. Beneficial owners held through a custodian can be counted toward the 100.
NZX’s stated reasoning is worth reading alongside the scaling tables. Meeting the requirements demonstrates that there is support for an entity seeking to list by initial public offering, and that there will be sufficient liquidity on listing. A sufficient spread reduces the risks of market manipulation associated with concentrated ownership, improves price discovery and reduces price volatility.
Where an applicant cannot meet the free float criteria, which the guidance note notes is common for a direct listing rather than an initial public offering, it can point to planned capital raisings, the timing and management of sell downs by major holders, or a liquidity facility. A liquidity facility is a commercial arrangement with a third party provider that is available to sell, and where relevant buy, the applicant’s quoted securities so that holders can trade regardless of wider supply or demand.
Analysis: the scale-down is doing two jobs at once
Read the Mighty River Power priority rules and the NZX spread test together and the shape of a scale-down stops looking arbitrary. A hard floor of $2,000 for every applicant who asked for at least that much does something the free float criteria needs: it manufactures a large population of holders sitting comfortably above the thousand dollar Minimum Holding, which is exactly what the count of 100 Non-Affiliated Holders is measuring. Scaling from the top down, rather than pro rata across the whole book, is the cheapest way to buy holder count out of a fixed number of shares.
It also explains why pro rata scaling is uncommon in retail tranches. A strictly proportional cut applied across a book containing many minimum-sized applications would push a tail of applicants below the $1,000 Minimum Holding, producing parcels that do not count toward spread and that the issuer may later have the power to sell under its own constitution. The floor-plus-benefit structure avoids creating that tail in the first place.
The two tranches are also being optimised for different things, and the offer document says so. Retail scaling is described in fixed, publishable rules: a floor, a pre-registration uplift, a cap at the amount applied for. Institutional scaling is described as a list of factors with no weights attached, ending in a catch-all for any other factors the seller considers appropriate. One tranche is being run for predictability and holder count. The other is being run for the quality of the register and for price, and it is deliberately left discretionary.
What the offer document establishes is the rules of the scale-down, not its outcome. What it does not establish is the actual scaling ratio, which is only knowable after the book closes, or the mix between tranches, which the same document says will be decided after the Institutional Offer closes. An applicant reading a prospectus can work out the floor beneath them and the uplift available to them. Nobody, including the seller, can work out the ratio in advance.
The specific things worth checking in any offer document are short. Find the minimum application amount and the increment above it. Find whether a guaranteed minimum allocation exists and what it is. Find whether any priority category applies and whether it is capped. Find how and when refunds are paid, and whether interest is paid on them. And check the resulting parcel against the thousand dollar Minimum Holding, because a holding below it is treated differently by the rulebook from the day it is allotted.
