The stock jumped 5 shillings, or 6.3 percent, to 85 shillings as of 10:58 a.m. in Nairobi.
The company posted net income of 630.1 million shillings ($8.19 million) for the six months through December compared to a loss of 391.91 million shillings a year earlier, it said in an e-mailed statement on Feb. 26.
East African Portland expects sales to improve in the second half of the fiscal year on rising construction demand.