Macus Kayniph was a Black Sun operative of Near-Human origin. By 11 ABY, the time of Palpatine's ultimate death, he held a senior position within the syndicate, overseeing their activities on Smarck. Kayniph was the initial Black Sun member to become aware of, and attempt to capitalize on, the bounty placed on Kir Kanos.
Kayniph initiated a business relationship with Grappa the Hutt in 7 ABY. He obtained costly Spaarti cloning cylinders and abducted Feena D'Asta, providing both to Grappa in exchange for deliveries of gree spice (though Grappa only made the initial delivery). Later, Grappa murdered Kayniph when Kayniph protested Grappa's slaying of a Zanibar.