A person who knows a lot about a company buys some of its cheap shares. This can mean they think the company will do well and the share price will go up. Three companies with low share prices that people in charge have bought shares in are Tecogen, Palatin Technologies and Augusta Gold. Read from source...

1. The article title is misleading and sensationalized, as it implies that insiders are buying three stocks under $3 when in fact only two of them fit the criterion. This creates confusion for readers who might expect to learn about all three stocks equally. A more accurate title could be "Palatin Technologies And 1 Other Stock Under $3 Insiders Are Buying".
2. The article does not provide any context or background information on why insider buying is important for investors and traders, nor does it explain how to interpret the data. This leaves readers uninformed and unable to make informed decisions based on the information presented. A better introduction could be "Insiders are often considered as knowledgeable market participants who can spot undervalued opportunities in the stock market. When they buy or sell shares of a company, it can signal their confidence or concern about its future prospects. In this article, we will examine three penny stocks that have experienced recent insider buying activity and discuss what it might mean for investors and traders."
3. The section on Tecogen Inc. is too brief and lacks detail. It only mentions the director's purchase of 1,000 shares at an average price of $0.70 without providing any context or analysis of why this is significant. For example, it could explain how this purchase compares to previous insider transactions, whether the stock has been trending up or down recently, and what the company's financial performance and outlook are. A more in-depth section on Tecogen Inc. could look like this:

"Tecogen Inc. is a small-cap company that designs, manufactures, markets, and maintains high-efficiency, ultra-clean cogeneration products. The company reported revenues of $5.9 million and a net loss of $1.8 million for the quarter ended Dec. 31, 2023. This indicates that the company is still struggling to generate profits from its operations despite having a niche product offering in the energy sector. However, the director's purchase of 1,000 shares at an average price of $0.70 could suggest that he sees value in the stock and expects it to rebound soon. Alternatively, he might have personal reasons for investing in the company, such as being a long-time shareholder or having a strategic partnership with the management team. In either case, this purchase is noteworthy because it represents a significant percentage of his annual salary and shows that he has confidence in the company's future prospects."