Right now, it takes a trade of well over ₦1 billion worth of Seplat shares to move the company’s official price on the Nigerian stock market (up or down). Soon, about ₦113 million will do it. That’s because the marketplace where Nigerians trade shares in companies like GTCO and MTN (the Nigerian Exchange, or NGX) has rewritten the rules that decide when a stock’s price can change and by how much.

In plain terms, the NGX has changed how many shares must trade in a single deal before the official price you see quoted (a stock’s published price) can move. That number now depends on exactly how expensive the stock in question is.

Based on the new rules, stocks priced at ₦1,000 and above need 10,000 units. Stocks priced between ₦500 and ₦999.99 need 50,000 units. And stocks priced below ₦500 still need 100,000 units.

The Securities and Exchange Commission (SEC) approved the new rules on June 16, 2026, but they aren’t live yet — and as of late July 2026, NGX had not announced a start date. That means you have more than enough time to get ahead of the change and learn all you need to know. 

This article explains what changed, why NGX did it, and what it means for your money, even if you don’t own a single share.

What exactly changed?

The price of a share on the Nigerian stock market doesn’t move simply because someone bought or sold it.

Here’s how it works: 

1. Orders go in. Buyers and sellers place orders through their stockbrokers, each side naming its price.
2. A trade happens when prices match. The moment a buyer’s price meets a seller’s, the deal goes through at that price.
3. The NGX publishes one official price per stock. That price comes from those completed trades. It’s the number your investment app displays, the figure used to value pensions and funds, and the price people mean when they say a stock “gained” or “lost” value that day.

But not every trade is allowed to set that official price.

Under the outgoing rule, every stock was treated the same: its published price could only change if at least 100,000 units traded in one deal, whether the share cost ₦2 or ₦11,000.

In practice, that meant around ₦200,000 worth of trading could move a ₦2 stock’s price, while an ₦11,000 stock needed a single trade worth about ₦1.1 billion — the same rule, but wildly different bars to clear.

The new system replaces that flat rule with three price groups (the “tiers”), and each group has its own two numbers: the minimum number of shares that must trade in a single deal before the published price moves, and the smallest change allowed in the price at a time (the tick size).

Stock group	Share price	Shares needed to move the price	Smallest price step (tick)
Group A	₦1,000 and above	10,000 units	10 kobo
Group B	₦500 to ₦999.99	50,000 units	5 kobo
Group C	Below ₦500	100,000 units	1 kobo

So what about a trade that’s too small to count?

Picture the published price as the tag in a shop window: small side-deals happen all day (sometimes at a little more or less than the price on the tag), but the tag only changes when a big enough sale goes through.

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A smaller trade still settles normally (the buyer gets their shares, the seller gets their money), but it doesn’t change the price on the tag or the official records built on it, like the day’s high and low. It stays off the official scoreboard, which makes tiny, suspicious trades much harder to use to fake a price.

Is this rule actually new?

This rule is a return, not an amendment. NGX first used this tiered system in 2018, scrapped it in 2019 for a single flat rule (every stock needed 100,000 units to move its price), and has now (in June 2026) brought the tiers back — updated to today’s higher prices, with ₦1,000 and ₦500 as the cut-offs instead of the old ₦100 and ₦5.

There’s one detail here that matters most to everyday investors: the tick size. The 2019 change removed the volume-only groups, so every stock needed the same 100,000 units; the old tick sizes remained. That meant a bank stock like GTCO, trading at around ₦128, kept changing price in 10-kobo steps.

Under the new rules, GTCO falls into Group C (stocks priced below ₦500). It still requires 100,000 units to be traded in a single deal before its price can move; that part is unchanged. What changes is the size of each move: its price now shifts 1 kobo at a time instead of 10 kobo.

Why did NGX make this change?

The goal is a market where prices reflect real demand and are harder to fake.

Three reasons sit behind it:

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1. To wake up “frozen” premium stocks. Under the flat rule, you needed to trade well over ₦1 billion worth of Seplat shares to nudge its price one step, so the priciest shares barely moved.
2. To stop tiny trades from faking a price. A single small trade could drag a high-priced stock’s published price around — a trick known as “painting the tape.”
3. To match how bigger exchanges work, where the rules scale with a stock’s value.

It isn’t just theoretical: in March 2026, NGX’s regulator fined five brokers ₦291 million for faking trades to manipulate prices (a market-manipulation strategy known as wash trading) — exactly the behaviour these rules target.

What does this mean for your money?

Here’s the practical part. It helps some holders while gently frustrating others, so here’s both sides with the maths.

Stock (recent price)	New group	Cost to move price one step — before	Cost to move it now	Net effect
Seplat (~₦11,360)	A	~₦1.14bn (100,000 units)	~₦113m (10,000 units)	~90% less capital
Aradel (~₦1,670)	A	~₦167m (100,000 units)	~₦16.7m (10,000 units)	~90% less capital
MTN Nigeria (~₦800)	B	~₦80m (100,000 units)	~₦40m (50,000 units)	~50% less capital
GTCO (~₦128)	C	~₦12.8m (100,000 units)	~₦12.8m (100,000 units)	No change — but tick falls 10→1 kobo

Prices are approximate, around June 2026; the takeaways hold regardless of the exact day’s price.

In other words:

• If you hold premium stocks (Groups A and B), this is good news. It takes far less money to move these prices — about 90% less for Group A names like Seplat and Aradel, and roughly 50% less for Group B names like MTN. More buyers and sellers can move the price, which should make these shares easier to trade at prices that reflect what people are truly willing to pay.
• If you hold everyday stocks (Group C — most Nigerians), the volume needed to move your stock is unchanged at 100,000 units. What changed is the tick: banks and consumer names now move in 1-kobo steps instead of 10-kobo, so prices climb in finer notches — it takes ten steps to cover the ground one used to. Not harmful, just slower and more granular.

And what if you don’t own any shares at all? Well, this part reaches almost everyone. By most estimates, fewer than 3% of Nigerians own shares directly — but your money is likely in the market anyway. Around 11 million Nigerians hold a pension, and roughly ₦5.46 trillion of it sits in these exact stocks; mutual funds and ETFs hold the same names. Your pension is a passenger on the same bus. You may never buy a share yourself, but how smoothly these prices move still feeds into your fund’s value.

Does this make the market riskier?

A fair question — and a lighter door swings both ways. The same ₦113 million trade that can lift Seplat’s price one step can also knock it down one step.

Nigerian stocks were up more than 50% for the year by mid-June 2026 — but June also brought a sharp pullback before a rebound, a reminder that bull markets don’t last forever.

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There’s a quieter effect too: smaller, faster price steps can tempt people away from steady investing and toward short-term trading. None of this should alarm you. It’s an upgrade, not a crisis, and the separate rule that prevents any stock from rising or falling more than 10% in a single day remains unchanged. Understanding the risks you already carry is the real point.

What about the rules on big “bulk” trades?

Separately, NGX has proposed (but not yet enacted) rules requiring a broker to get prior approval before a very large trade: selling off 5% or more of a company’s shares in one block (down from the old 30% threshold), or any single trade of 80 million units or ₦800 million and above.

The aim is to stop big players quietly splitting a huge sell-off into chunks to dodge scrutiny. As of writing, these are still proposals, not in force.

When does it take effect, and what should you do now?

The rule was approved on June 16, 2026, but the effective date hasn’t been announced — it isn’t live yet (as of late July, 2026). Mostly, the task now is to understand it before it switches on:

• Group A or B holders: expect a little more day-to-day price movement.
• Group C holders: your stock’s price will move in smaller, more frequent steps, but your reason for holding doesn’t need to change.
• Funds or pension only: there’s nothing to do — just know the connection is there.

If you want the basics first, start by learning how to invest money in Nigeria.

The bottom line

This is modernisation, not a warning sign. It sits alongside NGX’s recent move to next-day (T+1) settlement and longer trading hours. The rules change how prices move, not whether your money is safe.

And if it leaves you wondering how you’d actually own a piece of the market, Piggyvest’s Investify is one beginner-friendly way to start once you’re ready — not because of this news. Either way, the real advantage is understanding the system before it goes live.