This paper examines how interfirm trade relationships shape job‐to‐job mobility along domestic supply chains. Using Hungarian administrative data of firm‐to‐firm transactions and matched employer–employee records from 2015–2022, we estimate event‐study models with dyadic fixed effects and matched non‐trading controls. Trade roughly doubles worker mobility between partners, with larger effects for pairs characterized by high trade shares, and when the partner has a high wage, is a superstar, or growing. Downstream mobility always exceeds upstream mobility. We find no consistent differences between high‐ and low‐skill mobility, and mobility along supply chains does not generate systematically higher wage growth.
JEL Codes: F16, J60, F14
Keywords: Production Network, Interfirm Worker Mobility, Hungary