Company Performance: Sun Life's financial health, including revenue, profits, and expense ratios, significantly impacts its stock price. Strong earnings reports typically boost investor confidence.

Interest Rates: As an insurance and financial services company, Sun Life's profitability is closely tied to interest rates. Rising rates can increase investment income, positively affecting the stock.

Market Conditions: Overall market sentiment and economic conditions play a role. Bull markets tend to lift most stocks, while bear markets can pressure prices.

Regulatory Changes: Changes in regulations governing the insurance and financial sectors can impact Sun Life's operations and profitability, influencing stock value.

Dividend Yield: SLF-PK.TO is known for its dividend. The dividend yield relative to other stocks influences investor demand and price.

Competitor Performance: The performance of Sun Life's competitors in the insurance and financial services industry can affect investor sentiment and influence its stock price.

Global Events: Major global events, like economic recessions or geopolitical instability, can create uncertainty and affect investor risk appetite, impacting stock prices.

Investor Sentiment: General investor sentiment towards Sun Life and the broader financial sector can drive buying or selling pressure, influencing the stock's price.

Canadian Economy: The health of the Canadian economy, including factors like GDP growth and employment rates, can affect Sun Life's business and stock value.

Inflation: High inflation can erode the value of future earnings, potentially leading to a decrease in Sun Life's stock price.

Currency Fluctuations: As an international company, Sun Life's earnings can be affected by currency fluctuations, impacting its stock value.