Finnish economy: The overall health of the Finnish economy, including GDP growth, inflation, and unemployment rates, can influence investor sentiment towards Finnish companies like Fortum, impacting its stock price.

Energy prices: Fortum's core business is energy production, so fluctuations in electricity, gas, and other energy commodity prices directly affect its profitability and, consequently, its stock price.

Regulatory environment: Changes in Finnish and European energy regulations, policies related to renewable energy, nuclear power, or carbon emissions, can significantly impact Fortum's operations and investment decisions.

Investment strategies: Fortum's strategic decisions regarding investments in renewable energy, nuclear power, or acquisitions can signal future growth potential or increased risk, influencing investor confidence.

Dividend policy: Fortum's dividend policy and its ability to maintain or increase dividends can attract income-seeking investors, supporting its stock price.

Interest rates: Changes in interest rates can affect Fortum's borrowing costs and investment returns, indirectly impacting its profitability and stock valuation.

Competition: The competitive landscape in the energy sector, including the emergence of new players or technological disruptions, can affect Fortum's market share and profitability.

Global events: Geopolitical events, such as energy crises or international agreements related to climate change, can create volatility in energy markets and impact Fortum's stock price.

Investor sentiment: Overall investor sentiment towards the energy sector and Finnish stocks can influence trading volumes and price movements of FNNNF.US.

Currency exchange rates: Fluctuations in the exchange rate between the Euro (Fortum's reporting currency) and the US Dollar can impact the value of FNNNF.US for US-based investors.