NGX changes how stock prices move: How it affects your returns

The Nigerian Exchange (NGX) has introduced new rules that change how stock prices move on the exchange.

Under the new framework, a minimum number of shares must be traded in a single transaction before the price of any stock can shift anything below that minimum is treated as if the trade never happened.

The rules, part of a broader push by Nigerian regulators that has already delivered faster trade settlements and a modernised clearing system, were approved by the Securities and Exchange Commission on June 16, 2026, but an effective date is yet to be announced.

As an investor, how does it affect your returns? But first, let us look at what the rules say.

Under the old rule, the three groups were defined by much lower price bands:

Under the new rule, those price bands have been raised significantly.

What this means is that stocks that were previously Group A or Group B have been pushed down into lower groups.

The tick size: The minimum step by which any stock price can move stayed the same per group:

So, while the price bands changed, the tick sizes did not. A stock that moved into a lower group now moves in smaller price steps than before, which gives traders more precise entry and exit points.

Now let us look at each group and what it means for your money.

The minimum number of shares that must trade in a single transaction before the price moves is 10,000 units. The tick size is 10 kobo.

As of June 18, 2026, only 9 stocks qualify for this group. They are, Seplat Energy, Airtel Africa, Nestle, Dangote Cement, Presco, Aradel, Okomu Oil, Geregu, and AVA Infrastructure Fund.

In context, for Seplat’s price to move by even one kobo, someone needs to trade N113 million in a single transaction and for Aradel, that is N16.7 million.

Under the old rule, moving Seplat required N1.136 billion. The new rule cut that by 90%. For Aradel it dropped from N167 million to N16.7 million.

10,000 units can now move Group A prices; something practically impossible before. This suggests more participants, more price movement, more trading opportunities, and better potential returns.

Given the tick size, the gain moves at N10,000 for every 100,000 units. That is the most valuable price step of all three groups, and more so requires 90% less capital to trigger than under the old rule.

The minimum number of shares that must trade in a single transaction before the price moves is 50,000 units. The tick size is 5 kobo.

As of June 18, 2026, only 4 stocks qualify; MTN Nigeria, BUA Foods, Total Nigeria, and Betaglass.

In context, for MTN Nigeria’s price to move, it must trade N40 million and for Betaglass, it is N28.14 million.

Under the old rule, moving any Group B stock required between N56 million and N94 million, which is a bit difficult for retail investors to do.

Given the tick size, the movement is slower compared to Group A stocks.

For a trader holding the minimum of 50,000 units, every single 5 kobo move is worth N2,500, but multiple single sessions can add up quickly for an active trader who times their entry well.

The minimum number of shares that must trade in a single transaction before the price moves is 100,000 units, and the tick size is 1 kobo.

As of June 18, 2026, this was the most populated group on the NGX and the most significant change in the entire rule.

Most stocks that were previously Group A under the old N100 price and above band have been reclassified into Group C

Every bank stock, most consumer goods names, and virtually every stock ordinary Nigerians trade daily now sits in Group C: GTCO, Zenith Bank, Access Holdings, UBA, FirstHoldCo, Fidelity Bank, Dangote Sugar, Nigerian Breweries, Transcorp, and many more.

For these stocks, the investment required to move the price has not changed. What changed is the tick size.

Previously in Group A, GTCO moved in 10 kobo steps, now in Group C it moves in 1 kobo step. The price moves slower, and each step generates less return. A trader needs ten price movements today to earn what one movement delivered before.

Looking at the three groups, Group A and Group B investors; requires less amount to move prices under the new rules. This might open the door to more participants and potential return.

Group C investors, most Nigerians who own bank stocks, consumer names and penny stocks got the same unit threshold as before but moves slower under the new rules.

That does not make the rule wrong. Cleaning up price manipulation is a legitimate and necessary goal. But it does mean that the burden of this reform falls unevenly.

For the millions of everyday Nigerians whose entire portfolio sits in Group C, that is worth knowing before the effective date arrives.