This article is educational content about how securities markets generally operate. It is not investment advice and does not describe any specific current event, company or security.
When an initial public offering on the Nairobi Securities Exchange closes several times oversubscribed, the headline subscription figure that appears in news reports rarely matches what individual applicants actually see credited to their accounts. A retail investor who applied for a modest number of shares might receive only a fraction of that request, while an institutional fund down the corridor receives close to the full amount it bid for. The gap is not random, and it is not a case of first-come, first-served. It is the product of an allocation framework that issuers, sponsoring stockbrokers and Kenya’s Capital Markets Authority (CMA) design and disclose before the offer ever opens.
Setting the tranches before the offer opens
Before subscription begins, the issuer and its transaction advisers divide the offer into distinct pools of shares, commonly a retail tranche reserved for members of the public, an institutional tranche for entities such as pension schemes, insurance companies and collective investment funds, and sometimes a smaller reserved tranche for employees or the diaspora. The size of each tranche, along with minimum and maximum application limits, is set out in the prospectus that the CMA approves ahead of listing. This pre-agreed split is what ultimately governs how many shares are available for each investor category, regardless of how enthusiastically one group applies relative to another.
The pricing mechanism also differs by tranche in many offers. A fixed price structure sets a single subscription price for everyone from day one, while a book-built structure lets institutional investors submit indicative bids across a price range, helping the issuer discover a market-clearing price before it is fixed for the entire offer, retail included. Either way, once the final offer price is struck, it applies uniformly: no investor, large or small, pays a different price for the same class of share once listing occurs.
How oversubscription reshapes individual allocations
Oversubscription is handled within each tranche separately, not across the offer as a whole. If the retail tranche receives applications for far more shares than were set aside for it, the registrar or receiving agents typically scale back allocations proportionally, so every valid applicant receives a percentage of what they applied for rather than some investors receiving everything and others nothing. Many Kenyan offers also build in a guaranteed minimum allocation, a small fixed number of shares given to every valid retail applicant before any pro-rata scaling is applied to the remainder, a design intended to spread ownership as widely as possible. Funds attached to shares that could not be allocated are refunded to applicants within a timeframe specified in the prospectus and monitored by the CMA.
The institutional tranche is scaled back using similar proportional principles when oversubscribed, though the specific formula and any bidding tiers are again set out in the offer documents rather than improvised after the fact. In some structures, if one tranche is undersubscribed while the other is oversubscribed, the prospectus may permit a limited reallocation of unclaimed shares between tranches, a mechanism generally referred to as claw-back.
Why the two tranches serve different purposes
The separation between retail and institutional allocations exists because the two groups play different roles in a listing. Institutional participation, including any anchor investors who commit capital ahead of the public offer, contributes to price discovery and is often expected to support liquidity once trading begins. Retail participation, by contrast, helps an issuer meet exchange listing requirements around minimum shareholder numbers and free float, and broadens the base of public ownership in a locally listed company. Regulators generally require a minimum retail set-aside precisely to prevent institutional demand from crowding out ordinary investors entirely.
That is ultimately why two applicants for the same IPO, one an individual and one an institution, can end up with very different proportions of what they applied for. The outcome is not decided on listing day itself but embedded in tranche sizes, pro-rata rules and reallocation terms fixed in the prospectus long before the offer window opens.
