The Excel file reports outcomes from a two-round Delphi survey. The first round collected 21 valid questionnaires, retaining only responses with at least 25% completion and confirmed consent for data use. The second round was conducted in person during a Project meeting and involved 45 stakeholders from academia, industry, and agricultural cooperatives. Participants were split into two expert groups; one addressing on-farm stages of the value chain and the other focusing on seed processing and industrial activities. The groups reviewed 66 indicators derived from the first round, scoring each on a five-point Likert scale (1 = not relevant; 5 = highly relevant). For each of the four sustainability targets (economic, social, environmental and integration), the ten highest-ranked indicators were selected, prioritising those most frequently scored 4 or 5, with ties resolved by the number of top scores and then mean values. The second round included stakeholders mainly from research institutions, technical organisations, and industry, as well as producers, cooperatives, and farmers’ associations. Overall, the Delphi process reduced the initial set of 66 indicators to 40 final indicators (ten per sustainability target) ensuring balanced coverage across environmental, social, economic, and integration dimensions.