The Nigerian Exchange Limited (NGX) has introduced amendments to its dealing members’ rules that could significantly alter how share prices are determined in the equities market, particularly for high-value stocks.
The revised framework increases the minimum volume of shares required to influence the quoted market price of certain equities, a move aimed at strengthening price discovery, improving market integrity and reducing the impact of insignificant trades on stock valuations.
Under the amendments, equities listed on the Exchange will continue to be classified into three categories based on their market prices. However, the threshold for transactions capable of changing the published price of premium stocks has been substantially increased.
For Group A equities, which generally comprise higher-priced stocks supported by primary market makers, the minimum quantity required to move the market price has been raised from 50 shares to 10,000 shares.
Group B equities will now require trades involving at least 50,000 shares to influence the quoted price, up from the previous threshold of 10,000 shares. Group C equities remain unchanged at 100,000 shares.
The Exchange said the amendments are designed to ensure that price movements are driven by meaningful market activity rather than small transactions that may not accurately reflect investor sentiment or the true value of a security.
In addition to the revised volume thresholds, NGX has formalized a tiered tick-size structure that determines the minimum price increment at which equities can trade.
Group A stocks will trade in increments of 10 kobo, Group B stocks in increments of 5 kobo, while Group C stocks will continue to trade in increments of 1 kobo.
Market analysts say the changes could improve liquidity and market efficiency by encouraging larger trades to play a more prominent role in price formation.
The new framework is also expected to reduce excessive price fluctuations caused by low-volume transactions.
The amended rules further clarify the methodology for determining opening and closing prices. Opening prices will continue to be established through the Exchange’s opening auction process, where the Automated Trading System calculates a price that maximizes executable volume while minimizing market imbalances.
Closing prices will remain based on the last traded price in a security’s primary listing market, while securities that do not trade on a particular day will retain their most recent traded price as the official closing price.
Another notable provision relates to small trades. Transactions below the prescribed thresholds will not affect key market statistics, including last traded price, daily highs and lows, 52-week highs and lows, opening prices, closing prices and market indices.
The reforms reflect NGX’s ongoing efforts to align its market structure with international best practices while enhancing transparency, price efficiency and investor confidence in the Nigerian capital market.
For investors, the amendments mean that larger and more representative trades will have greater influence on stock prices, potentially creating a more accurate reflection of market demand and supply dynamics across the Exchange.
