The significant insider selling at Credit Acceptance Corporation, especially without any corresponding insider buying, raises caution. Despite the high level of insider ownership, the lack of recent purchases does not inspire confidence in the company's prospects.

CEO Ken Booth expressed his excitement about Martin's promotion, praising his strategic approach to financial performance and team development. Martin himself expressed admiration for the company's mission and culture, and is eager to play a larger role in its future.

Investors seem to maintain the high P/E ratio for Credit Acceptance due to the anticipation of higher future growth. As long as these expectations persist, the share price will likely remain supported.

Arthur Smith's large share disposal, despite current price exceeding his average sale price, signifies possible lack of confidence in company's share value. Absence of recent insider purchases also becomes worrisome. Despite high insider ownership showcasing alignment with shareholders, history of share sales could make stock less appealing.

The market sentiment towards the stock has cooled despite its EPS growth. Investors' concerns might include the company's underperformance in the market over a twelve month period and a total shareholders' loss of 1.0% per year over five years.