Company Performance: Revenue, profit margins, subscriber growth, and overall financial health directly impact investor confidence and stock price.

Industry Trends: Developments in the telecommunications sector, such as 5G rollout, competition, and regulatory changes influence investor sentiment.

Macroeconomic Factors: Economic growth, interest rates, and inflation in Portugal and globally affect investor risk appetite and investment decisions.

Market Sentiment: Overall mood and confidence in the stock market, and specifically towards Portuguese equities, impact trading activity and stock prices.

Regulatory Environment: Government policies regarding telecommunications, spectrum allocation, and competition impact NOS's operations and profitability.

Technological Advancements: Adoption of new technologies and NOS's ability to innovate and adapt to changing consumer demands affect its competitiveness.

Dividend Policy: NOS's dividend payouts influence investor attraction and demand for its stock.

Competition: The competitive landscape in the Portuguese telecommunications market, including major players and their strategies, affects NOS's market share and profitability.

Management Decisions: Strategic decisions by NOS's management team, such as investments, acquisitions, and restructuring, impact investor confidence.

Global Events: Major global events, such as economic crises or political instability, can affect stock markets worldwide, including NOS.LS.