Ampere (ex-APM), Marvell, Cavium (now also under Marvell), HiSilicon (Huawei), Amazon (Annapurna Labs), Fujitsu… Ampere, Cavium, HiSilicon, Fujitsu are the one

Ampere (ex-APM), Marvell, Cavium (now also under Marvell), HiSilicon (Huawei), Amazon (Annapurna Labs), Fujitsu… Ampere, Cavium, HiSilicon, Fujitsu are the ones with actually custom cores.