DGX vs SPY: Quest Diagnostics Incorporated vs SPDR S&P 500 ETF Trust Historical Returns & Investment Comparison
This DGX vs SPY comparison analyzes the historical stock performance of Quest Diagnostics Incorporated 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 returns, volatility, and consistency across market cycles.
Use the interactive calculator below to adjust the investment amount and time period, visualizing how Quest Diagnostics Incorporated and SPDR S&P 500 ETF Trust have historically performed against each other.
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Performance Summary
$10,000 invested from 1996 to 2025 (30 years)
Head-to-Head Record
Over the 30-year comparison period, Quest Diagnostics Incorporated outperformed SPDR S&P 500 ETF Trust in 14 years, while SPDR S&P 500 ETF Trust outperformed Quest Diagnostics Incorporated in 16 years.
DGX - Quest Diagnostics Incorporated
SPY - SPDR S&P 500 ETF Trust
Overall Winner: DGX with an average annual return of 23.58% (vs 11.71% for SPY)
Understanding DGX vs SPY Performance
When comparing Quest Diagnostics Incorporated and SPDR S&P 500 ETF Trust, investors should consider multiple factors beyond just total returns. Volatility, consistency of growth, dividend payments, and sector-specific risks all play crucial roles in determining which stock might be better suited for your investment strategy and risk tolerance.
Historical performance data shows how each stock responded to market downturns, economic expansions, and company-specific events. While past performance doesn't guarantee future results, understanding these patterns can help inform investment decisions and portfolio allocation strategies.
Cumulative Growth Comparison
A $10,000 investment in Quest Diagnostics Incorporated grew to $772,764, compared to $250,597 for SPDR S&P 500 ETF Trust over the same period.
Year-by-Year Comparison
| Year | DGX Return | DGX Cumulative | SPY Return | SPY Cumulative | Difference | Winner |
|---|---|---|---|---|---|---|
| 1996 (Start) | - | $10,000.00 | - | $10,000.00 | - | Initial Investment |
| 1997 | +8.04% | $10,803.57 | +21.20% | $18,223.19 | -13.17% (SPY) | SPY |
| 1998 | +15.38% | $12,465.66 | +33.14% | $24,261.81 | -17.75% (SPY) | SPY |
| 1999 | +4.01% | $12,966.10 | +28.03% | $31,063.11 | -24.02% (SPY) | SPY |
| 2000 | +68.04% | $21,788.40 | +20.66% | $37,482.18 | +47.38% (DGX) | DGX |
| 2001 | +373.33% | $103,131.76 | -8.85% | $34,165.23 | +382.18% (DGX) | DGX |
| 2002 | +6.29% | $109,614.91 | -10.13% | $30,703.75 | +16.42% (DGX) | DGX |
| 2003 | -18.08% | $89,793.98 | -22.42% | $23,820.14 | +4.34% (DGX) | DGX |
| 2004 | +23.92% | $111,268.44 | +24.18% | $29,580.86 | -0.27% (SPY) | SPY |
| 2005 | +33.23% | $148,237.83 | +10.75% | $32,760.13 | +22.48% (DGX) | DGX |
| 2006 | +9.43% | $162,216.85 | +5.32% | $34,504.59 | +4.11% (DGX) | DGX |
| 2007 | +3.98% | $168,668.78 | +13.84% | $39,281.03 | -9.87% (SPY) | SPY |
| 2008 | +3.53% | $174,614.38 | +5.33% | $41,375.53 | -1.81% (SPY) | SPY |
| 2009 | +0.71% | $175,860.65 | -36.24% | $26,382.38 | +36.95% (DGX) | DGX |
| 2010 | +15.13% | $202,465.47 | +22.65% | $32,359.23 | -7.53% (SPY) | SPY |
| 2011 | -11.10% | $179,987.23 | +13.14% | $36,610.39 | -24.24% (SPY) | SPY |
| 2012 | +6.97% | $192,525.00 | +0.85% | $36,922.44 | +6.11% (DGX) | DGX |
| 2013 | +1.98% | $196,335.22 | +14.17% | $42,154.69 | -12.19% (SPY) | SPY |
| 2014 | -6.86% | $182,867.28 | +29.00% | $54,380.19 | -35.86% (SPY) | SPY |
| 2015 | +29.73% | $237,224.82 | +14.56% | $62,298.86 | +15.16% (DGX) | DGX |
| 2016 | +5.37% | $249,962.05 | +1.29% | $63,101.60 | +4.08% (DGX) | DGX |
| 2017 | +32.61% | $331,477.30 | +13.59% | $71,674.43 | +19.03% (DGX) | DGX |
| 2018 | +8.51% | $359,672.58 | +20.78% | $86,569.38 | -12.28% (SPY) | SPY |
| 2019 | -14.20% | $308,601.91 | -5.25% | $82,026.91 | -8.95% (SPY) | SPY |
| 2020 | +32.89% | $410,088.61 | +31.09% | $107,527.02 | +1.80% (DGX) | DGX |
| 2021 | +15.25% | $472,645.41 | +17.24% | $126,059.55 | -1.98% (SPY) | SPY |
| 2022 | +45.48% | $687,593.91 | +30.51% | $164,514.60 | +14.97% (DGX) | DGX |
| 2023 | -2.94% | $667,401.05 | -18.65% | $133,838.54 | +15.71% (DGX) | DGX |
| 2024 | -9.66% | $602,906.50 | +26.71% | $169,585.78 | -36.37% (SPY) | SPY |
| 2025 | +9.43% | $659,782.10 | +25.59% | $212,981.61 | -16.16% (SPY) | SPY |
| 2026 | +17.12% | $772,764.17 | +17.66% | $250,597.02 | -0.54% (SPY) | SPY |
Annual returns include dividends and stock splits. Cumulative values show growth of $10,000 invested from the first year. Positive difference means DGX outperformed SPY that year.
Company Profiles
Quest Diagnostics Incorporated
DGX
Quest Diagnostics is a leading American clinical laboratory and a critical infrastructure provider in the U.S. healthcare system, offering a wide range of diagnostic information services. The company provides comprehensive diagnostic testing, information, and services to patients, physicians, hospitals, and health plans.
Key Innovations
- ✓Pioneered in providing more accurate and affordable outpatient diagnostic testing, making essential healthcare services more accessible.
- ✓Developed a broad portfolio of diagnostic tests and services, including highly specialized genetic testing and advanced Alzheimer's diagnostics.
Business Segments
- Diagnostic Information ServicesProvides a full range of routine and specialized diagnostic testing, including esoteric testing, anatomic pathology, and genetic testing.
SPDR S&P 500 ETF Trust
SPY
SPY is the first exchange-traded fund (ETF) listed in the US. It is designed to track the S&P 500 Index, which measures the performance of the large-cap segment of the US equity market.
Key Innovations
- ✓First US-listed ETF
Business Segments
- ETFPassive investment vehicle tracking the S&P 500.
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: All dividend payments are reinvested
- ✓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.