ISO Certification Breadth and Export Scale: Based on Panel Data of Chinese A-share Listed Firms

Background: International management-system certification may function both as an externally auditable signal and as a basis for internal process standardisation. Existing export studies have focused mainly on a single standard or a limited setting, leaving less evidence on annual coverage across multiple certification categories. Aims: This study examines whether ISO certification breadth is associated with export scale among Chinese listed firms and whether it is associated with digital technology application and employee communication. Study Design: An unbalanced firm-year panel is estimated with additive industry and year fixed effects and firm-clustered standard errors. Place and Duration of Study: Chinese A-share listed firms, 2010–2024. Methodology: Certification breadth records annual coverage across ISO 9001 quality-management certification, ISO 14001 environmental-management certification, and occupational-health-and-safety (OHS) management-system certification. The outcome is the natural logarithm of positive export revenue. Robustness and selection checks use alternative clustering, sample exclusions, industry-by-year fixed effects, lagged certification breadth, an initially uncertified subsample, and multivalued IPTW. Results: With eight controls, a one-unit increase in certification breadth is associated with a 0.0682 increase in log export revenue (p≈0.021). Certification breadth is also positively associated with digital technology application and employee communication, while the export-scale association varies with Belt-and-Road exposure and analyst coverage. Conclusion: ISO certification breadth is robustly associated with export scale among existing exporters, but the observational design does not establish a strict causal or export-entry effect. Recommendation: Firms and certification-supporting institutions should treat certification as a complement to substantive process integration, employee communication, and information transparency rather than as a stand-alone guarantee of export performance.