Heavyweight stocks set for easier price discovery as NGX tweaks trading rules

The Nigerian Exchange Limited (NGX) is adjusting its pricing methodology. The bourse is reverting to the 2018 market-microstructure rules governing how equity prices move on the trading floor. By dismantling the uniform 100,000-unit requirement implemented in recent years, the exchange is reintroducing a graduated, three-tier volume framework.

​Under this restored structure, stocks trading at N1,000 and above will require 10,000 shares to change their price. Equities trading between N500 and N1,000 will require 50,000 shares, while those priced below N500 will maintain the 100,000-share threshold. This means high-priced heavyweight equities will require significantly lower transaction volumes to trigger price movements. The strategic pivot aims to improve price discovery and revive liquidity across various asset classes. The effective date for these new rules will be communicated soon.

​Broader market modernisation efforts

​This regulatory adjustment follows other recent modernisation efforts. The Nigerian capital market officially transitioned to a T+1 settlement cycle on 1 June 2026. This historic shift made the market the first in Africa to implement a one-day settlement framework for equities and commodities.

​Additionally, the exchange recently adjusted its trading hours. By moving the opening bell to 9:00 am and extending the closing gong to 4:00 pm, the bourse nearly doubled its daily activity window to seven hours.

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​Historical context of the pricing model

​The decision to lower thresholds for high-priced stocks traces back to the 2018 market microstructure rules for Group A equities. Under that original framework, the exchange categorised equities into three distinct tiers to break away from the blanket par-value rule.

​Group A covered high-priced stocks trading at N100 or above, requiring 10,000 units to shift the published ticker price. Group B encompassed medium-priced stocks between N5 and N100, requiring 50,000 units, while Group C low-priced stocks below N5 required 100,000 units.

​Rationale behind the uniform standard

​The NGX later amended its pricing methodology under Rule 15.29.2.C.2 of the rulebook to enhance market integrity. This amendment removed the graduated thresholds and established a uniform minimum of 100,000 units for all price adjustments. The harmonised standard applied to all securities, whether penny stocks or heavyweights trading well over N1,000.

​Under the uniform standard, the Automated Trading System categorised any transaction below 100,000 units as a small trade. While these small trades executed normally for buyers and sellers, the system ignored them when calculating official last trade prices, daily highs, or daily lows. This measure successfully prevented tiny retail clips from artificially swinging the valuations of large-cap equities.