In 2013, Google, Apple, Adobe, Intel settled a class action lawsuit for $415 million. The suit alleged that these companies colluded with other major corporations in Silicon Valley to suppress employee wages by agreeing not to poach workers from other cartel members. We build on niche theory in a dynamic context through the analysis of a network of manager job changes before and during the period the cartel was active. We investigate two related questions. First, how did the cartel affect managerial labour flows? And second, how did the cartel affect other firms competing for talent in the labour market? We use the temporal exponential graph model (TERGM) to examine the changes in manager job transitions before and during the cartel’s activities. We find that firms that were not part of the cartel lost relatively more workers than expected when their niches overlapped with a higher proportion of cartel member firms. This work suggests paths for future labour market policy making.