We examine search-based peer (SBP) groups proposed by Lee, Ma, and Wang (2015) 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.

Firms rely on patenting and trade secrecy to protect their intellectual property. We study how changes in the trade-off between patenting and secrecy affect firms’ stock liquidity and financing outcomes. We show that an international trade agreement (TRIPS) that strengthened patent protection led to a 10.2% increase in patenting, accompanied by a 14.0%–27.1% improvement in stock liquidity for firms in patent-reliant industries. This in turn allows the affected firms to increase equity financing by 1.9% and reduce leverage by 5.9%. Our results suggest that policies that promote use of patenting over secrecy can reduce informational frictions in equity markets.