Standard Legal is unaware of any restriction on ownership of shares of a Class C Corporation by an LLC.
In fact, it is fairly common for a Limited Liability Company to be the owner of stock in a corporation.
Conversely, a Corporation can also be the owner/member of a Limited Liability Company.
Be aware, however, that under the IRS rules a Limited Liability Company cannot be an owner of stock of a corporation that elects S tax treatment.
Get complete details here on Standard Legal’s Incorporation and LLC legal forms software here.