YouTuber Jimmy Donaldson, a.k.a. MrBeast, is expanding his company's C-suite, naming his first CMO. Sujit JAISWAL / AFP via Getty Images

MrBeast has found his first CMO, Business Insider exclusively learned.

The top YouTuber's company promoted Michelle St. Jacques to the role. St. Jacques has led consumer goods, including Feastables, MrBeast's snack and candy company, since February.

In her new role, she'll add marketing duties for Beast Industries, the star's holding company, while continuing to oversee consumer goods. She's based in Chicago.

Beast Industries started the search earlier this year, a move that reflected the company's growing ambitions. It's been expanding far beyond its core YouTube channel — which has over 524 million subscribers — and seeks to become a Disney-style entertainment giant.

Beast Industries CEO Jeff Housenbold said in a memo to staff, viewed by Business Insider, that he considered external candidates for the CMO role but decided St.…