Try the SEC's EDGAR or the websites of individual states' secretaries of state. Coordinated Legal maintains a page of links to these state offices.
You might also try Nexis Uni: Go into advanced search, click 'select a specific content type' and then 'SEC filings' under the 'Company and Financials' heading. From there you can enter your keyword and search.
![](https://libapps.s3.amazonaws.com/accounts/55911/images/Nexis_Uni_SEC_Filings.png)
From there you can click 'Location' on the left side and select whatever state you're looking for.
![](https://libapps.s3.amazonaws.com/accounts/55911/images/Nexis_Uni__State_SEC_Search.png)