To address visa portability challenges, H-1B visas particularly, businesses must integrate a certain number of strategies to maintain compliance, navigate complexities and mitigate risks. A business can do that by:

• Engaging Experienced Immigration Attorney: Given the fact that visa portability can be complex, in the sense of involving complex documentation and regulatory requirements, having legal counsel can be very crucial.
• Ensuring Timely Filings: When it comes to H-1B portability rules, employers must file petitions with supporting evidence (nonfrivolous petition I-129) well in advance before expiration dates, since employees can start working immediately once a petition has been filed (approval unnecessary). In addition, due to the heightened scrutiny under the Trump administration, they must provide robust documentation and anticipate Requests for Evidence (RFEs).
• Assessing Job Offers for Similarity: To evaluate whether the new job aligns with the older one, using DOL resources like the 2018 System Occupational Classification (SOC) is crucial for maintaining green card validity under AC21. 
• Maintaining Compliance and Documentation: It is very important to ensure compliance with I-9 records and labor regulations, by keeping detailed records, notifying USCIS of changes and finally making sure there is adherence to the new form requirements under the January 2025 rule.
• Strategic Workforce Planning: We’re specifically talking here about cases where businesses go through changes such as mergers or acquisitions, which could significantly affect visa sponsorship. So, it is important to conduct visa audits and have your legal team review all foreign workers immigration statuses during M&A. 

Communication with Employees: By keeping them informed about the portability process and the grace period (60 days to find new sponsors or depart the US).