For a public company, the term "bad types of investors" is subjective and depends on the company's perspective and objectives. However, there are certain types of investors that might be considered less desirable for various reasons. Here are some examples:

1. Short-term speculators: These investors focus on short-term gains rather than long-term growth, and their trading activities can lead to increased share price volatility. This may not align with the interests of a company seeking stable, long-term investors.
2. Activist investors: These investors buy significant stakes in a company and push for changes in management, strategy, or operations, sometimes with the goal of maximising shareholder value. While activism can sometimes lead to positive changes, it can also create conflicts and distract management from running the business.
3. Pump-and-dump schemers: These individuals or groups manipulate share prices by spreading false or misleading information, driving up the price and then selling their shares at a profit. This kind of activity is illegal and can damage a company's reputation and share price.
4. Overly concentrated investors: If a single investor or a small group of investors holds a significant stake in a company, their decisions can disproportionately influence the company's share price and operations. This concentration of ownership might deter other investors and lead to a lack of diversification.
5. Ethically questionable investors: Some investors may have controversial backgrounds or engage in activities that conflict with a company's values or social responsibility objectives. This can create negative publicity and potentially harm the company's reputation, particularly if they are a major shareholder.

It's important to note that public companies often have limited control over who invests in their shares, as shares are traded on open markets.

InvestorHub helps companies identify harmful shareholders through its advanced investor intelligence tools.

‍