Active Mutual Fund Co-Holdings and the Buy-Side Peer Network
A new study finds that active mutual fund managers create networks of co-held stocks, which can predict future returns. Analyzing U.S. equity data from 1990 to 2024, the authors show that stocks held by similar funds forecast next-month returns, especially when these peers are closely linked. This effect is not explained by industry or analyst coverage. A simple strategy using these signals earns 0.67 percent monthly, revealing surprising market predictability shaped by mutual fund behavior.
What it examines
This paper uses active mutual fund holdings to define peer groups based on real investor behavior, not just researcher choices. It studies how these peer groups predict future stock returns in U.S. equities from 1990 to 2024, focusing on information flow and price adjustment in financial markets.
What it concludes
The study finds that stocks held by similar funds can predict each other's returns, especially for less-followed stocks. This helps investors build better trading strategies and understand how information spreads in markets. Future research could explore other markets or investor types, and improve models of information diffusion.
Evidence objects
Active mutual fund managers create a network of co-held stocks, enabling predictions of future returns. This 'co-holding network' is based on U.S. equity data from 1990 to 2024, revealing surprising market insights.
key_findings bullet 1 · key_findings · validation V0
Stocks held by similar funds, termed 'holdings-based peers,' can forecast next month's returns, especially when closely related. This predictive power is unexplained by traditional factors like industry, analyst coverage, or common ownership.
key_findings bullet 2 · key_findings · validation V0
A simple investment strategy using peer signals earns a robust 0.67% monthly return ($0.67%$), with gains persisting. The studys methodology is rigorous, but gradual price adjustment and real-world trading limits warrant further exploration.
key_findings bullet 3 · key_findings · validation V0
This paper introduces a novel method for defining equity peer groups using active mutual fund co-holdings, diverging from traditional researcher-specified approaches. Its originality lies in leveraging buy-side networks to predict next-month stock returns, offering fresh insights into information diffusion. Robust empirical results highlight significant implications for portfolio management and alpha generation.
key_findings bullet 4 · key_findings · validation V0
Raw abstract and provenance
- … We vary K below to examine how return predictability decays with increasing holdings-space distance. We map these quarterly network structures into monthly return …
Source row: 107 · abstract type: snippet