Leader-Follower Dynamics in Shareholder Activism

Activist investors are often seen as independent players. Each builds a stake, pushes for change, and captures value. But in reality, activism increasingly involves multiple blockholders targeting the same firm. This paper introduces a new perspective. Activists do not need formal coordination to act together. Instead, they use market signals. Trading itself becomes a way to influence other investors. The result is a subtle but powerful mechanism. Activists can shape each other’s behavior and ultimately, the value of the firm.

Leader-Follower Dynamics in Shareholder Activism

• Doruk Cetemen, Gonzalo Cisternas, Aaron Kolb, S. Viswanathan
• The Journal of Finance, 2026
• A version of this paper can be found here
• Want to read our summaries of academic finance papers? Check out our Academic Research Insight category

Key Academic Insights

Activists coordinate without explicit agreements
The paper shows that multiple activists can coordinate purely through trading. A “leader” trades first. A “follower” interprets that trade as a signal about future activism. This creates a form of implicit coordination without communication or formal group formation.

Trading is not just about profits. it is about influence
In classic models, investors trade to exploit information. Here, trading also shapes other investors’ beliefs. A leader’s trades influence how followers perceive firm value and expected activism. This creates a second channel of incentives beyond price impact.

Correlation between activists changes everything
If activists have similar positions or views, market signals become more powerful. With positive correlation, leaders may actually sell on average to influence followers. With negative correlation, they buy more aggressively. This overturns the traditional idea that informed trading is always unpredictable.

Leadership creates real effects on corporate governance
Because ownership determines effort, trading decisions affect how much activists intervene. When leaders reduce their stake, they shift costs onto followers. When they increase it, they take on more responsibility. This directly impacts firm value and governance outcomes.

Prices reflect activism dynamics
When activism is present, prices deviate from normal benchmarks. With positive correlation, prices tend to be lower on average. With negative correlation, higher. These “abnormal” price patterns help explain empirical findings around activist events.

Practical Applications for Investment Advisors

Rethink how activism works

Do not view activist investors as isolated actors. Their interactions matter. Outcomes depend not only on fundamentals but also on how investors influence each other through markets.

Interpret trading signals more carefully
Large trades by activists are not always straightforward bets on value. They may be strategic signals designed to influence other investors. Context is critical.

Be cautious with event-driven strategies
Price movements around activism events may reflect coordination dynamics, not just information. This can affect timing, expected returns, and risk.

Focus on ownership structure
The degree of similarity among investors matters. Firms with more aligned blockholders may experience different outcomes than those with more heterogeneous investors.

How to Explain This to Clients

“Activist investing is not just about one investor stepping in and fixing a company. Often, multiple investors are involved, even if they do not formally coordinate. They watch each other’s moves and react. Sometimes even using trades as signals. This interaction can amplify the impact on the company, but it can also create unexpected market behavior. Understanding these dynamics helps explain why prices move the way they do around activist events”

The Most Important Chart from the Paper

Figure 4 represents the leader’s and follower’s payoffs under sequential versus simultaneous moves.

The results are hypothetical results and are NOT an indicator of future results and do NOT represent returns that any investor actually attained. Indexes are unmanaged and do not reflect management or trading fees, and one cannot invest directly in an index.

Abstract

This paper develops a theory of interaction among activist blockholders, focusing on how they coordinate without explicit agreements. By introducing sequential trading and interdependent private information, the model shows how a leading activist can use market signals to influence followers’ behavior. Trading decisions affect not only prices but also other investors’ incentives to acquire shares and engage in governance. The results highlight how these dynamics shape firm value, stock prices, and the effectiveness of activism, offering new insights into multi-activist interventions and their real economic impact.