 SAN ANTONIO--BUSINESS WIRE--NuStar Energy L.P. NYSE: NS today announced that its Board of Directors has declared a first quarter 2021 common unit distribution of 0.40 per unit. The first quarter common unit distribution will be paid on May 14, 2021 to holders of record as of May 10, 2021. NuStar Energy L.P.s Board of Directors also declared a first quarter 2021 Series A preferred unit distribution of 0.53125 per unit, a Series B preferred unit distribution of 0.47657 per unit and a Seri 