GILD vs SPY: Gilead Sciences Inc. vs SPDR S&P 500 ETF Trust Historical Returns & Investment Comparison

This GILD vs SPY comparison analyzes the historical stock performance of Gilead Sciences Inc. and SPDR S&P 500 ETF Trust side-by-side. Using real, adjusted market data, this tool shows how identical investments in both stocks would have performed over time—highlighting differences in annual returns and consistency across market cycles.

Use the interactive calculator below to adjust the investment amount and time period, visualizing how Gilead Sciences Inc. and SPDR S&P 500 ETF Trust have historically performed against each other.

Company Profiles

Gilead Sciences Inc.

GILD

Gilead Sciences Inc. is a biopharmaceutical company that discovers, develops, and commercializes innovative medicines in areas of unmet medical need. The company's primary focus areas include HIV, liver diseases (hepatitis B and C), oncology, and inflammation. Gilead is committed to advancing science to improve the lives of patients worldwide, bringing forward transformative therapies that address challenging diseases and improve patient outcomes.

Key Innovations

✓Integration of advanced data analytics and automation into core operational workflows.
✓Proprietary technology architecture developed by Gilead Sciences Inc. to optimize operational performance.
✓Pioneered highly effective antiviral therapies that have transformed the treatment and prevention of HIV/AIDS.
✓Developed groundbreaking treatments for hepatitis C, achieving high cure rates and significantly impacting global public health.
✓Strategic R&D investment driving next-generation solution design and market differentiation.
✓Expansion of digital transformation initiatives across product engineering and customer delivery.

Business Segments

HIV
Develops and commercializes antiviral drugs for the treatment and prevention of HIV/AIDS.
Liver Diseases
Focuses on therapies for chronic viral hepatitis, including hepatitis B and C.
Oncology
Develops and commercializes treatments for various types of cancer.

SPDR S&P 500 ETF Trust

SPY

SPDR S&P 500 ETF Trust (SPY) is an exchange-traded fund managed by State Street Global Advisors that provides investors with targeted exposure to U.S. Large-Cap Equity by tracking the S&P 500 Index. The fund is structured to offer efficient, liquid, and low-cost access to its underlying asset class, utilizing continuous creation and redemption mechanisms to maintain tight alignment between market price and Net Asset Value (NAV). Widely utilized by institutional wealth managers, pension funds, and retail investors alike, SPY plays a central role in modern portfolio construction, asset allocation, and tactical risk management.

Key Innovations

✓Intra-day secondary market liquidity for benchmark S&P 500 Index exposure.
✓In-kind creation and redemption process mitigating embedded tax capital gains distributions.
✓Ultra-low expense ratio cost structure enabling compounding long-term investment returns.
✓Institutional-grade portfolio transparency with daily published holding disclosure.

Business Segments

Core Equity / Asset Portfolio
Direct holdings of underlying constituent securities comprising the S&P 500 Index.
Creation and Redemption Mechanism
Operational framework facilitating institutional Authorized Participants in exchanging basket securities for fund shares.
Securities Lending & Yield Optimization
Program generating incremental income by lending portfolio securities to institutional counterparties under collateralized agreements.

How This Comparison Works

Our stock comparison tool uses adjusted closing prices to calculate year-by-year returns for both stocks. This ensures an apples-to-apples comparison that accounts for:

✓Dividends: Prices are dividend-adjusted, reflecting the effect of dividend payments over time
✓Stock splits: Historical prices are adjusted for all splits
✓Head-to-head record: Shows which stock outperformed each year
✓Statistical analysis: Average returns, best/worst years, and win rates

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Important Disclaimer

This comparison tool is for educational and informational purposes only and does not constitute financial, investment, or trading advice. Past performance is not indicative of future results. Historical returns include dividends and stock splits but do not account for taxes, fees, inflation, or individual circumstances. Stock market investments carry risk, including the potential loss of principal. Always consult with a qualified financial advisor before making investment decisions. The data presented is based on historical market data and may contain inaccuracies or delays.