SETH ONYANGO, BIRD NEWSROOM IN corporate Nigeria, a shift appears to be underway as more financial institutions appoint woman corporate executives to head some of the country's top banks. Nigeria’s mainstream financial institutions are banking on women to lead the next chapter of growth in the sector, with more lenders appointing female chief executives. The move, which has seen more women take key banking roles in just the past week, positions Africa’s economic powerhouse as one of the bellwethers of gender equality on the continent’s financial services. Last week, Guaranty Trust (GT) Bank appointed Miriam Olusanya as its Managing Director/CEO,…