African equities opened the week under pressure, with the Nairobi Securities Exchange (NSE) emerging as the weakest-performing published market index tracked by Mansa Markets on Monday, October 19, 2026.
The NSE’s Nairobi All Share Index (NASI) fell 1.86% to 240.5 points, while market capitalisation stood at KSh4.08 trillion, equivalent to approximately $31.6 billion. The decline came despite gains by some listed companies.
Centum Investment Company was the day’s leading gainer on the NSE, rising 3.64% to KSh18.50 ($0.14) per share. Kenya Re-Insurance Corporation was the biggest decliner on the exchange’s reported list, slipping 0.97% to KSh4.10 ($0.032). Trading volume reached 751,500 shares.
Across 17 published exchanges, 123 stocks advanced, 128 declined and 257 remained unchanged, indicating slightly more declining than advancing stocks.
However, performance varied across markets. Ghana’s stock market led the published index rankings, with the Ghana Stock Exchange Composite Index gaining 1.59% to close at 14,396.17 points. Its market capitalisation stood at GH¢271.26 billion ($24.8 billion).
Ghana Oil Company was the strongest performer on the exchange’s reported list, climbing 9.09% to GH¢6.00 per share. Digicut Production & Advertising fell 8.16% to GH¢0.45. Trading volume totalled 724,700 shares.
South Africa’s Johannesburg Stock Exchange also traded higher, with its J203 Index rising 0.69% to 110,934.23 points. The exchange’s market capitalisation stood at R23.95 trillion ($1.41 trillion), while total trading volume reached 194.51 million shares.
Copper 360 led the reported gainers, advancing 13.21% to R0.60 per share. Europa Metals, however, plunged 18.80% to R2.85, making it the biggest decliner across the tracked markets.
Elsewhere, Asarian Energy Limited (AAE) on Namibia’s stock exchange recorded the strongest individual stock gain across the tracked markets, surging 14.82%.
For investors, the NSE’s weak start to the week puts market direction and individual stock performance firmly in focus as trading continues.