Yougov, a market research agency company, agreed to acquire Lean App, an open banking start-up. Financial terms were not disclosed. The transaction will allow Yougov to use financial data – such as the value, timing and frequency of purchases made on and offline – to improve its products. The move comes soon after the launch of Yougov safe, a cross device transfer and data marketplace, as it aims to boost its stream of observed behavioural data.