The progressive reduction of CAP intervention and the abolition of milk quotas in 2015 is provoking a shift in the governance of milk supplies giving a greater role to supply chain arrangements. However, the unbalanced power within the supply chain reduces the negotiating power of individual farmers, exposing them to market risks and unfair trade practices. Collective organizations are considered a viable solution for increasing farmers protection within the supply chain. This paper analyses the impact of supply agreements between dairy farmers and collective organizations on milk prices, production costs and mark-up in England using survey data from 200 dairy farmers in Devon and Somerset. We use a coarsened exact matching model to estimate average treatment effects and logistic regressions to explain the differences in costs, prices and mark-up. Results show that UK farmers selling milk to collective organizations receive 4.4% lower prices and have 17% higher production costs. Farmers selling to collective organizations seek stable market access and protection and at this end they are willing to accept price volatility, higher costs and financial exposure which can be faced through higher predisposition in taking financial risks.