Search-Based Peer Groups and Commonality in Liquidity*

We examine search-based peer (SBP) groups proposed by and their relationship with commonality in liquidity. Our results confirm that SBP affiliation is a significant determinant of commonality in liquidity and, unlike market- and industry-commonality, SBP-commonality has been increasing over the past 15 years. We separate retail from institutional investor queries by tracing the IP locations of Electronic Data Gathering, Analysis, and Retrieval (EDGAR) searches. Our results show that retail investors are responsible for roughly 85% of the EDGAR searches that generate SBP groups. Overall, our study provides new evidence of a significant demand-side commonality associated with SBP affiliations.