This study investigates the impact of the COVID-19 pandemic on the public-private partnership (PPP) infrastructure market, focusing on Colombia's fourth generation roads concession program (4G) and analyzing 29 toll road PPP initiatives. Using content analysis (CA), natural language processing (NLP), and social network analysis (SNA), the study provides empirical evidence on how PPP renegotiations triggered by the pandemic have been conducted and how contracting parties have responded to such renegotiation efforts. Results show that, from a total of 13 renegotiation processes, most projects relied on two joint general agreements focused on addressing temporary suspension of construction works, mandatory preventive isolations (quarantines), and halting toll collection. However, there were important differences in terms of how PPP parties employed multiple contractual mechanisms to counteract COVID-19 effects according to conditions associated with project complexity, project stage, procurement strategy, and procedures triggering renegotiations. Overall, this research offers an understanding of the dynamics associated with COVID-related renegotiations within PPP projects, which can inform contract and renegotiation strategies and improve future infrastructure projects, particularly in the face of unexpected events.