Arcus Biosciences Inc. (RCUS) witnessed a significant 5.05% plummet in its stock price during Monday's intraday trading session. This downward movement comes despite a recent $15 million insider purchase, highlighting investors' concerns about the company's prospects.

The insider purchase, which was part of a larger $150 million underwritten offering, aimed to fund ongoing research and development activities for Arcus Biosciences. However, the market's reaction suggests that this capital injection alone may not be sufficient to alleviate concerns about the company's future performance.

While Arcus Biosciences reported an increase in total revenues for the full year 2024, amounting to $258 million compared to $117 million in the previous year, the company also disclosed a substantial net loss of $283 million. This financial performance, coupled with the broader market sentiments, appears to have weighed heavily on investor confidence, leading to the stock's decline.