This market will resolve to the person announced as the opposition's joint presidential candidate. An announcement counts only if it is made jointly by, or publicly endorsed by, at least three of the candidates. If no such announcement is made before IEBC presidential nominations close on 11 June 2027, this market will resolve to "No single candidate". A qualifying candidate not listed resolves to "Other". If a candidate is announced and later replaced before 11 June, the last qualifying announcement counts. The resolution source is a consensus of credible reporting, led by Nation, The Standard and Citizen Digital.

Kenya's opposition , Kalonzo Musyoka's Wiper Patriotic Front, Rigathi Gachagua's DCP, Edwin Sifuna's Linda Mwananchi and Fred Matiang'i's Jubilee, Ndindi Nyoro among others — has promised one candidate against President William Ruto in the 10 August 2027 election. The principals say the name will come in 2027.