evidence: According to the finding of Numbers.lk's final pre-election poll, Anura Kumara Dissanayake (AKD) of the National People's Power (NPP) leads the Sri Lankan presidential election race with 40% support among likely voters. Sajith Premadasa follows with 29% support, while incumbent President Ranil Wickremesinghe has 25% support. Namal Rajapaksa, garners only 3% support among likely voters. [...] Note: With no prior data on preferential voting in Sri Lankan presidential elections, these online response estimates may differ significantly from the actual election results, particularly regarding the number of people who indicate they will cast a preferential vote compared to those who actually do. However, the research team believes that while the percentage of preferential votes from the total votes cast may vary, the ratio of preferences among the candidates is unlikely to change significantly. [...] Between September 9th and 16th, 2024, we surveyed 5,335 adults from all 22 electoral districts in Sri Lanka. Responses were collected online through targeted Facebook advertisements designed to reach a diverse audience and minimize selection bias. Responses from voluntary participants from Numbers.lk social media, Facebook, and Twitter were also collected separately and stratified, forming a secondary dataset. The survey used a disproportionate stratified random sampling method based on 2019 voting preferences, ethnicity, gender, income, and age. This methodology was employed to mitigate potential biases and ensure a representative sample of the Sri Lankan electorate. The margin of error for the poll, taking the design effect into consideration, is ±5%.