The athlete-representation company owned by Harvick adds Tate to No. 4-ranked UFC fighter Donald "Cowboy" Cerrone, who faces off against No. 7 contender Bobby "King" Green in the co-main event at UFC 178 on Sept. 27.
Cerrone welcomed his new teammate on Twitter.
"It's an awesome feeling to be able to sign with KHI Management," Tate said. "I have been keeping my eye on them ever since they started working with Donald Cerrone in the UFC. They have all the capabilities I am looking for in an agency, and I really look forward to what the future will hold both inside and out of the Octagon."
Tate, 27, is currently ranked second in the UFC women's bantamweight (135 lbs.) division. Following a win against No. 7-ranked Liz Carmouche that extended her MMA record to 14-5, she is next scheduled to fight Rin Nakai (16-0-1) on Sept. 20 in Tokyo, Japan.
KHI Management also represents NASCAR driver and broadcaster Jeff Burton, PGA golfer Jason Gore and country music artists Jake Owen and Matt Stillwell.
"What Miesha has been able to do in her MMA career speaks volumes not only for her athleticism but for her marketability," Harvick said. "She is a brand all her own, and she has proven she can captivate an audience and move the needle. With that and the solid foundation of sponsors we have here at KHI, I'm excited about our future together."