This Prize for a Series is awarded to comics authors at the Angoulême International Comics Festival since 2004. As is the customary practice in Wikipedia for listing awards such as Oscar results, the winner of the award for that year is listed first, the others listed below are the nominees.
2004: 20th Century Boys by Naoki Urasawa, Panini Comics/Génération Comics
Bételgeuse by Léo, Dargaud
Black Hole by Charles Burns, Delcourt
Bouncer by François Boucq & Alejandro Jodorowsky, Les Humanoïdes Associés
Donjon by Joann Sfar & Lewis Trondheim, Delcourt
Sambre by Yslaire, Glénat
Stéphane Clément, chroniques d'un voyageur by Daniel Ceppi, Requins Marteaux
2005: Les Formidables Aventures de Lapinot by Lewis Trondheim, Dargaud
Buddy Longway by Derib, Le Lombard
Le cri du peuple by Jacques Tardi and Jean Vautrin, Casterman
Coq de combat by Izo Hashimoto and Akio Tanaka, Delcourt
Daredevil by Brian Michael Bendis and Alex Maleev, Marvel Comics
Un privé à la cambrousse by Bruno Heitz, Seuil
Universal War One by Denis Bajram, Soleil
2006: Blacksad: Ame rouge by Juanjo Guarnido and Juan Diaz Canales, Dargaud
Black Hole: Bleu profond by Charles Burns, Delcourt
Bone: La couronne d’aiguilles by Jeff Smith, Delcourt
Bouncer: La vengeance du manchot by François Boucq and Alexandro Jodorowsky, Les Humanoïdes Associés
Lupus part 3 by Frederick Peeters, Atrabile
Pascin: La java bleue by Joann Sfar, l’Association
Théodore Poussin: Les jalousies by Frank Le Gall, Dupuis
2010: Jérôme K. Jérôme Bloche by Alain Dodier, Dupuis
2011: Il était une fois en France by Fabien Nury and Sylvain Vallée, Glénat
2012: Cité 14 by Pierre Gabus and Romuald Reutimann, Les Humanoïdes Associés
2013: Aâma by Frederik Peeters, Gallimard