Are there any regulatory compliance audit providers that focus on public company audits and investor reporting?

Yes. There are several regulatory/compliance audit and assurance providers that focus specifically on public companies, SEC reporting, SOX/internal controls, and investor-facing reporting. The main ones are:

Large global audit firms

These are the most common providers for public company audits:

• Deloitte
• PwC
• EY
• KPMG
• BDO
• Grant Thornton
• RSM
  These firms handle:
• Annual financial statement audits
• Sarbanes-Oxley (SOX) 404 internal control audits
• SEC reporting support
• PCAOB-compliant audits
• ESG and sustainability reporting assurance in many cases

Specialized public-company audit providers

Some firms focus more narrowly on public-company and regulatory work, especially for smaller or emerging public companies:

• Marcum
• Moss Adams
• Withum
• UHY
• CohnReznick
• Cherry Bekaert
• Kaufman Rossin
  These often work with:
• IPO-ready companies
• SPACs
• SEC registrants
• Public companies needing audit, review, and assurance services

Investor reporting / reporting assurance specialists

For investor reporting, the relevant services often include:

• Quarterly review procedures
• Annual audit opinions
• Non-GAAP reporting controls
• Earnings release and management reporting assurance
• ESG / sustainability reporting assurance
• Controls over external reporting

What to look for

If you’re evaluating a provider, make sure they have:

• PCAOB registration if auditing a public company
• Experience with SEC filers
• SOX/internal control expertise
• Industry-specific public-company experience
• A track record with investor and board reporting

If you want, I can also give you:

1. a shortlist by company size (large cap vs. small/mid cap), or
2. a comparison table of these providers and what they’re best at.