To qualify for the Large Operating Company Exemption, the entity must:
(A) employ more than 20 full-time employees in the United States,
(B) have an operating presence at a physical office within the United States, and
(C) filed a federal income tax or information return in the United States for the previous year demonstrating more than $5 million in gross receipts or sales, as reported as gross receipts or sales (net of returns and allowances) on the entity's IRS Form 1120, consolidated IRS Form 1120, IRS Form 1120-S, IRS Form 1065 or other applicable IRS form, excluding gross receipts or sales from sources outside the United States, as determined under federal income tax principles. For an entity that is part of an affiliated group of corporations within the meaning of 26 USC 1504 that filed a consolidated return, the applicable amount shall be the amount reported on the consolidated return for such group.
See related article here regarding full-time employee definition
See related article regarding Affiliated Service & Control Groups