The Nigerian Exchange (NGX) closed lower on Tuesday, 18 August 2026, as renewed selling pressure across several stocks dragged the benchmark All-Share Index (ASI) down by 843.42 points, or 0.35%, to 241,611.23.

The decline erased ₦544.48 billion from the market’s capitalisation, which fell to ₦155.97 trillion at the close of trading.  Analyst attribute this development to profit-taking as investors attempt to exit from certain assets and rebalance their portfolios.

Market sentiment was broadly negative, with decliners significantly outnumbering gainers. Of the stocks traded, 23 advanced, 41 declined, while 83 stocks closed unchanged, pointing to a cautious trading session.

Market performance

The NGX ASI opened the session under pressure and remained in negative territory, reflecting weakness across several counters.

The 0.35% decline extended the market's recent volatility as investors continued to reposition their portfolios amid changing expectations around interest rates, corporate earnings and liquidity conditions.

The market's breadth indicator also reinforced the bearish tone. With 41 decliners against 23 gainers, selling activity was more widespread than the headline index movement alone suggests.

Top gainers

HMCALL emerged as the day's strongest performer, gaining 9.97% to ₦3.20.

Other notable gainers included:

The performance of HMCALL placed the stock firmly at the top of the gainers' chart, while VERITASKAP and TANTALIZER also recorded notable buying interest.

REDSTAREX leads decliners

Selling pressure was particularly pronounced in Red Star Express, which fell 10.00% to ₦16.20, making it the worst-performing stock of the session.

The decline highlights the uneven performance across individual equities, despite the relatively modest movement in the overall market index.

Trading activity remains strong

Despite the decline in the benchmark index, trading activity remained substantial.

Investors exchanged 418.91 million shares in 35,625 deals, with the total value of transactions reaching ₦19.57 billion.

Sterling Financial Holdings Company recorded the highest trading volume, with 51.57 million shares changing hands.

By value, Seplat Energy led the market, reflecting continued investor interest in the energy counter.

What the session means for investors

Tuesday's trading session points to a cautious near-term market mood.

While the ASI's 0.35% decline was relatively moderate, the negative breadth indicates that weakness was spread across a sizeable number of listed stocks. This suggests that investors were selective and that pockets of selling pressure remained evident across the market.

The combination of lower market capitalisation and negative breadth also shows that the session was not simply driven by isolated movements in a few large-cap stocks.

For investors, attention will remain focused on the performance of major sectors, corporate earnings, liquidity conditions and monetary-policy expectations as the market approaches the next trading sessions.

NGX at a glance — 18 August 2026

Market close: Tuesday, 18 August 2026, 17:30 WAT.