Africa's Biggest IPO Ever Will Float Just 3.3% of Itself — Why That Matters

Dangote Refinery is raising about $1.6 billion by selling roughly one-thirtieth of the company. Two earlier listings — one Saudi, one Nigerian — show what tends to happen next, and where the real risk sits for anyone buying from outside the country.

What's actually on offer

Dangote Petroleum Refinery opened public subscription on 14 September 2026, closing 13 October 2026, at ₦525 per share for 4.1 billion shares — roughly $1.6 billion at a valuation near $49 billion. Listing on the Nigerian Exchange is expected in late November.¹²

The business case is real. The refinery swung from a $476 million loss in 2025 to $1.82 billion in after-tax profit in the first half of 2026, reaching its 700,000 barrels-per-day design capacity in testing by June.³¹ Building a refinery at this scale in Africa is a genuine industrial achievement.

But two numbers in the prospectus matter more than the headline: the offer represents a 3.30% free float⁴, and once listed, the refinery could account for roughly 30–35% of the entire Nigerian Exchange's market capitalisation.¹

What a "free float" is, and why 3.3% is unusual

The free float is the share of a company actually available for public trading. The rest stays with founders, governments, or strategic holders.

A typical large listed company floats most of itself. Floating 3.3% means about 97% of the shares don't trade. That has three predictable consequences, and none of them are opinions — they're mechanics:

• Price is set by a small pool of buyers. The "market value" reflects what a limited set of local investors will pay for a sliver, not a global consensus on what the whole company is worth.
• Small money moves the price a lot. Thin float means higher volatility in both directions.
• Index inclusion is capped. Most index providers weight by free-float market cap, so a huge company with a tiny float gets far less passive-fund buying than its headline size suggests.

Precedent 1: Saudi Aramco floated 1.5%

In December 2019, Saudi Aramco raised $25.6 billion — then the largest IPO in history — by selling 1.5% of itself at SAR 32 per share, valuing it at about $1.7 trillion.⁵

What followed is instructive:

• It popped, immediately and mechanically. Shares opened 10% up, hitting the exchange's daily limit on day one.⁶
• Foreign investors largely passed. Weak international interest and questions about how much local demand was genuinely independent led one analyst to call the result "not exactly a free market price."⁷ Local demand, by contrast, was five times oversubscribed.⁷
• The float itself became a known constraint. Analysts note the small float limits liquidity, leaves the stock vulnerable to sharp moves on modest volume, and caps index weight and passive flows.⁸
• The rich valuation ate into returns. Shares did reach a record SAR 43 in 2022 during an oil boom⁹ — but commentary at the time observed that the demanding IPO price meant shareholder returns lagged what they might have been given how far oil prices had risen.¹⁰

Precedent 2: MTN Nigeria, on this exact exchange

The closest local comparison is MTN Nigeria, the NGX's largest listing before this one. It listed in May 2019 at ₦90, rose 10% in its first 16 minutes of trading, closed 2019 at ₦105, and reached ₦169.90 by the end of 2020.¹¹

Today MTN Nigeria trades around ₦845 — a gain of roughly 840% in naira terms since listing — and it is the second most valuable stock on the exchange at about 11% of total NGX market capitalisation.¹²

By naira, that's a superb outcome. Which brings us to the part almost nobody writes about.

The lesson nobody puts in the headline: a naira return is not a dollar return

If you live in Nigeria and earn and spend in naira, MTN's roughly 840% gain is exactly what it appears to be.

If you invested from outside Nigeria, your actual return has two moving parts:

Your return = the share price change × the change in the exchange rate

The naira has weakened very substantially against the dollar since 2019. At the Dangote offer's own figures — a pre-listing market capitalisation of ₦63.07 trillion described as approximately $46.2 billion⁴ — the implied rate today is roughly ₦1,365 to the dollar. In mid-2019, when MTN listed, the naira traded in the low hundreds per dollar.

Run that through the formula and a large share of MTN's naira gain is absorbed by currency depreciation for a dollar-based investor. The stock still did well — but "up 840%" and "what a foreign investor actually earned" are very different numbers.

One more thing worth thinking about: are these profits typical?

That $1.82 billion half-year profit is real and audited. It also arrived during an extraordinary year for refining.

The Strait of Hormuz crisis has disrupted global fuel supply since February 2026, and refiners generally earn more when fuel is scarce relative to crude. A refinery running at full capacity into that environment is operating in unusually favourable conditions.

That doesn't make the profits fake or the business weak. It's a reason to distinguish between exceptional-year earnings and through-the-cycle earnings when looking at any valuation multiple — and to ask what the same business earns when fuel markets normalise. Refining is famously cyclical. That question applies to every refiner on earth, not just this one.

What to actually watch — not predictions

• Allotment. In oversubscribed offers, applicants often receive fewer shares than requested. The basis of allotment determines what you actually get.
• Lock-ups and follow-on sales. A 3.3% float can grow. Aramco returned with a secondary offering years later. More supply changes the scarcity dynamic that supports a thin-float price.
• Liquidity after listing. Can you sell a meaningful position without moving the price? For thin floats, sometimes not.
• Concentration for Nigerian investors. If one company becomes a third of the exchange, a "diversified" Nigerian index fund is substantially a bet on that one company. See How to Diversify.
• Access. Most mainstream US and European brokerages don't offer NGX shares. Any platform that does adds its own counterparty risk, which deserves as much research as the stock.

What we're not telling you

Whether to subscribe. We don't publish buy or sell recommendations, and we have no idea what this stock will do — neither does anyone else with any reliability. What we can say is that a 3.3% float, a currency with a history of sharp depreciation, an exceptional year for refining margins, and limited access for foreign investors are all facts you should weigh before deciding. Our editorial policy explains why we stop there.

Sources

1. Discovery Alert, "Dangote Refinery IPO Opens — Africa's Biggest Listing," Sept. 2026 — discoveryalert.com
2. Bloomberg via Energy Connects, "Dangote's Fortune Set to Jump $23 Billion on Refinery IPO," Sept. 2026 — energyconnects.com
3. Wikipedia, "Dangote refinery" — wikipedia.org
4. Dangote Refinery IPO investment note (offer terms, free float and pre-listing capitalisation), Sept. 9, 2026 — mystocks.africa (note: this source is a platform selling access to the offer)
5. Fortune, "The Saudis Are Set to Make IPO History," Dec. 2019 — fortune.com
6. Al Jazeera, "Saudi Aramco shares surge 10 percent on stock market debut," Dec. 2019 — aljazeera.com
7. CNBC, "Aramco's record-breaking IPO is 'not exactly a free market price,'" Dec. 2019 — cnbc.com
8. Invest Riyadh, "Aramco IPO: The World's Largest Listing" — investriyadh.ai
9. Gulf News, "Saudi Aramco's shares hit a record high at SR43" — gulfnews.com
10. eMorningCoffee, "Revisiting Saudi Aramco" — emorningcoffee.com
11. The Cable, "TIMELINE: How MTN share has performed on the stock exchange since 2019" — thecable.ng
12. AFX Kwayisi, MTN Nigeria (NGX:MTNN) stock quote — afx.kwayisi.org