NGX pivots back to 2018 market microstructure rules for stock price movement

…N1,000 plus stocks require 10,000 shares to change price

The Nigerian Exchange Limited (NGX) is adjusting its pricing methodology, reverting to the 2018 market microstructure rules that govern 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 require 10,000 shares to change the price, stocks trading at N500 and less than N1,000 require 50,000 shares to change the price, while stocks priced less than N500 require a 100,000 shares to change the price.

This implies that the high-priced heavyweight equities will once again require significantly lower transaction volumes—just 10,000 units—to trigger a price movement, a strategic pivot aimed at improving price discovery and reviving liquidity across different stock classifications.

The effective date for this new rules will soon be communicated.

The Nigerian capital market officially transitioned to the T+1 settlement cycle on June 1, 2026. The historic shift made the market the first in Africa to implement a one-day settlement framework for equities and commodities.

Also, the recent (effective April 27) adjustment of opening bell to 9:00 am and extending the closing gong to 4:00 pm, nearly doubles its daily activity window to seven hours.

Read also: NGX Group advances ESG agenda

New rules on share price change almost similar to 2018 market microstructure rules under “Group A” …

Though the regulatory framework has since moved away from microstructure rules/ segmented structure, ​the idea of needing 10,000 units to move a stock priced at N1,000 or above traces back to the 2018 market microstructure rules under “Group A” equities.
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​The historical context: Three-tier pricing (2018)….

​When the Exchange initially moved away from the blanket par-value rule, it categorised equities into three distinct tiers. Under that specific 2018 framework, the required volumes to trigger a price change (up or down) were split as follows:

​Group A (High-Priced): Stocks trading at N100 or above (which would include your N1,000 stock example). It required a minimum of 10,000 units to shift the published ticker price.

​Group B (Medium-Priced): Stocks trading between N5 and N100. This tier required 50,000 units to change the price.
​Group C (Low-Priced): Stocks trading below N5. This tier required a heavier volume of 100,000 units to impact the price.

​The current rule: Harmonised 100,000 units standard

​To enhance market integrity and ensure that all price-improving or price-declining movements are driven by material transaction sizes, the NGX amended its Pricing Methodology rules (specifically Rule 15.29.2.C.2 of the Rulebook).

The graduated volume thresholds were removed. A uniform minimum of 100,000 units was required to change the stock price of any security on the NGX, regardless of whether it is a low-penny stock or a high-priced heavyweight trading well over N1,000.

​Any trade executed below this 100,000-unit threshold was categorised by the Automated Trading System (ATS) as a “small trade.”

While these small trades execute perfectly fine for the buyers and sellers involved, they were completely ignored by the system when calculating the market’s official last trade price, daily highs, or daily lows. This successfully prevented tiny retail clips from artificially swinging the valuations of large-cap equities.