TY - JOUR N2 - The Wiener?Hopf factorisation of a Lévy or Markov additive process describes the way that it attains new extrema in terms of a pair of so-called ladder height processes. Vigon?s theory of friendship for Lévy processes addresses the inverse problem: when does a process exist which has certain prescribed ladder height processes? We give a complete answer to this problem for Markov additive processes, provide simpler sufficient conditions for constructing processes using friendship, and address in part the question of the uniqueness of the Wiener?Hopf factorisation for Markov additive processes. UR - https://doi.org/10.1090/tran/9266 ID - discovery10194365 EP - 7752 Y1 - 2024/// TI - Markov additive friendships AV - public A1 - Döring, Leif A1 - Trottner, Lukas A1 - Watson, Alexander R JF - Transactions of the American Mathematical Society VL - 377 N1 - This version is the author accepted manuscript. For information on re-use, please refer to the publisher?s terms and conditions. SP - 7699 ER -