Most investors assume a stock’s price changes because someone buys or sells it, that’s not entirely the case.
On the Nigerian Exchange (NGX), a trade must meet a certain minimum volume requirement before a move (tick) can impact a stock’s official market price. But from 17 August 2026, those requirements are going to change.
The NGX, with approval from the Securities and Exchange Commission (SEC), is aiming to replace its long-standing volume threshold system with a new tiered framework designed to improve price discovery and reduce market distortions.
This may sound like a technical rule change, but in practice, it affects how accurately stock prices reflect what investors are willing to pay.
The Problem with Treating Every Stock the Same (Old Rule)
For years, the NGX applied a simple rule. To move a stock’s official price, a trade had to involve at least 100,000 shares. A simple, easy to understand rule. The problem is that markets are rarely that simple.
Under the old system, both a ₦2.00 and ₦1,500.00 share required a minimum trade of 100,000 shares before the exchange would recognise a price movement. But while the rule was the same, the money involved was not.
For the ₦1,500 stock, that meant finding someone willing to commit ₦150 million. For the ₦2 stock, just ₦200,000.
With this, higher-priced stocks often appeared less responsive because moving their prices required enormous capital. Meanwhile, lower-priced stocks could see official price changes triggered by comparatively modest sums.
The rule treated all stocks equally, even though the market did not.
What Changes on 17 August? (New Rule)
Now, the NGX wants to change the single threshold rule with a tiered system based on share price of stocks.
| Share Price | Minimum Volume Required |
|---|---|
| ₦1,000 and above | 10,000 shares |
| ₦500 – ₦999.99 | 50,000 shares |
| Below ₦500 | 100,000 shares |
The higher the share price, the fewer shares required to trigger a recognised price movement.
The logic seems straightforward. If a stock already costs hundreds or thousands of Naira per share, insisting on a 100,000-share trade can create an unnecessarily high barrier before genuine buy/sell pressure appears in the market price.
The new framework lowers that barrier without removing it entirely.
Why Investors Should Care
Most retail investors will almost never place a trade large enough to trigger these thresholds themselves except they’re like rich-rich. But that doesn’t mean the rule has no impact on them. Every investor relies on prices to make decisions. The question is whether those prices accurately reflect what’s happening in the current market.
Take a high-priced stock such as Airtel Africa, Seplat or Aradel. Under the old system, substantial buying interest could emerge without immediately affecting the official market price because the volume requirement (100,000) was so high.
The new framework makes lessens that volume requirement, meaning that the market becomes a little more responsive. It also becomes harder for unusually small trades to create misleading signals, particularly in lower-priced stocks where relatively little money could sometimes have an outsized impact on reported price movements.
By adjusting volume thresholds to reflect those differences, the exchange is trying to ensure that prices respond to meaningful activity rather than arbitrary rules, making pricing information timely for investors to decide whether a stock is expensive, cheap, overvalued or undervalued.
