Résumé : We present the first spin-parity analysis of the K+K+K-) system produced in the reaction K+p → K+K+K-p, and show that the general features of this system resemble those of the (ππ+π-) and Kπ+π-) systems produced in the reactions π(K)p → π(K)π+π-p. There is a low mass enhancement, (47 ± 11)% of which corresponds to 1+ states decaying to Kø. At higher (K+K+K-) masses 2- → Kf′ becomes increasingly significant and at all masses there is a 0- contribution of roughly 30%. © 1975.