Under Reg CF, companies are exempt from registering their offering with states. However, states still have the authority to require filings for Reg CF offerings under certain circumstances. A state is allowed to request that a company file state notices if: 

- That state is the company’s principal place of business, or

- Over 50% of sales in the campaign were made to investors who reside in that state.

More information can be found here, although it is each company’s responsibility to check the laws of their state and make any necessary filings.