Company Performance: Revenue, profit margins, and growth prospects significantly influence investor confidence and stock price. Positive financial results often drive the price up.

Industry Trends: The overall health and outlook of the technology sector, particularly the semiconductor industry, impacts investor sentiment towards Advantest and its stock valuation.

Economic Conditions: Macroeconomic factors such as global economic growth, interest rates, and inflation can influence investor risk appetite and impact stock market performance, including ACT.MU.

Technological Innovation: Advantest's ability to develop and introduce cutting-edge testing solutions for advanced semiconductors plays a crucial role in its competitive advantage and stock price.

Market Sentiment: Investor sentiment, driven by news, rumors, and general market psychology, can cause short-term fluctuations in the stock price, often independent of underlying fundamentals.

Competition: The performance of Advantest's competitors and their market share can affect investor perceptions of Advantest's prospects and thus its stock price.

Currency Fluctuations: As a Japanese company, Advantest's earnings are impacted by currency exchange rates, particularly the Yen/Euro rate, affecting the value of ACT.MU traded in Europe.

Geopolitical Events: Global events, trade policies, and political instability can create uncertainty in the market and affect investor sentiment towards technology stocks like ACT.MU.

Supply Chain: Disruptions in the semiconductor supply chain impact Advantest's ability to deliver testing equipment, thus affecting revenue and impacting stock prices.

Regulatory Changes: Changes in regulations related to the semiconductor industry or international trade can affect Advantest's business operations and consequently its stock price.