Financial Performance: Pfizer's revenue, earnings, and profit margins greatly influence investor confidence.

Drug Pipeline: Success or failure of new drug development significantly impacts future growth prospects.

Regulatory Approvals: Approvals from health authorities like the TGA affect market access and revenue potential.

Patent Expirations: Loss of exclusivity on key drugs can lead to generic competition and reduced sales.

Market Sentiment: General investor mood and economic conditions impact stock valuations.

Competition: Actions by rival pharmaceutical companies affect market share and pricing power.

Dividend Policy: Dividend payouts can attract or deter investors depending on their income needs.

Economic Conditions: Global and Australian economic health influences healthcare spending.

Interest Rates: Changes in interest rates can affect the attractiveness of Pfizer's stock versus bonds.

Currency Fluctuations: Exchange rate movements impact reported earnings when translating foreign income.

Mergers & Acquisitions: Acquisitions and mergers can create synergies or increase debt levels.

Political Climate: Government healthcare policies and regulations affect the pharmaceutical industry.

Pandemics and Epidemics: Outbreaks of infectious diseases can increase demand for certain Pfizer products.