How do you gather business data?

I’m with a recruitment firm based in San Jose, specializing in providing offshore remote IT staff to companies throughout California. We focus on specific skill sets such as Salesforce, ServiceNow, cybersecurity, and Workday. I’m looking to identify companies that are currently hiring for these roles so I can reach out and assist them with their staffing needs. Are there any tools or strategies available for collecting this information?

I would appreciate any insights you can share. Thank you!