IDXX vs SPY: IDEXX Laboratories, Inc. vs SPDR S&P 500 ETF Trust Historical Returns & Investment Comparison
This IDXX vs SPY comparison analyzes the historical stock performance of IDEXX Laboratories, 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 returns, volatility, and consistency across market cycles.
Use the interactive calculator below to adjust the investment amount and time period, visualizing how IDEXX Laboratories, Inc. and SPDR S&P 500 ETF Trust have historically performed against each other.
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Performance Summary
$10,000 invested from 1991 to 2025 (35 years)
Head-to-Head Record
Over the 33-year comparison period, IDEXX Laboratories, Inc. outperformed SPDR S&P 500 ETF Trust in 24 years, while SPDR S&P 500 ETF Trust outperformed IDEXX Laboratories, Inc. in 9 years.
IDXX - IDEXX Laboratories, Inc.
SPY - SPDR S&P 500 ETF Trust
Overall Winner: IDXX with an average annual return of 28.40% (vs 11.71% for SPY)
Understanding IDXX vs SPY Performance
When comparing IDEXX Laboratories, Inc. 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 IDEXX Laboratories, Inc. grew to $8,245,952, compared to $250,597 for SPDR S&P 500 ETF Trust over the same period.
Year-by-Year Comparison
| Year | IDXX Return | IDXX Cumulative | SPY Return | SPY Cumulative | Difference | Winner |
|---|---|---|---|---|---|---|
| 1991 (Start) | - | $10,000.00 | - | $10,000.00 | - | Initial Investment |
| 1992 | +47.11% | $14,710.74 | - | - | - | Tie |
| 1993 | +48.86% | $21,898.94 | - | - | - | Tie |
| 1994 | +93.18% | $42,304.76 | +8.71% | $10,870.91 | +84.47% (IDXX) | IDXX |
| 1995 | +15.20% | $48,735.09 | +0.67% | $10,943.47 | +14.53% (IDXX) | IDXX |
| 1996 | +170.50% | $131,830.17 | +37.39% | $15,035.16 | +133.11% (IDXX) | IDXX |
| 1997 | -23.51% | $100,842.20 | +21.20% | $18,223.19 | -44.71% (SPY) | SPY |
| 1998 | -52.78% | $47,619.93 | +33.14% | $24,261.81 | -85.91% (SPY) | SPY |
| 1999 | +67.51% | $79,768.02 | +28.03% | $31,063.11 | +39.48% (IDXX) | IDXX |
| 2000 | -41.10% | $46,986.64 | +20.66% | $37,482.18 | -61.76% (SPY) | SPY |
| 2001 | +36.96% | $64,355.24 | -8.85% | $34,165.23 | +45.81% (IDXX) | IDXX |
| 2002 | +28.13% | $82,461.48 | -10.13% | $30,703.75 | +38.27% (IDXX) | IDXX |
| 2003 | +17.66% | $97,022.19 | -22.42% | $23,820.14 | +40.08% (IDXX) | IDXX |
| 2004 | +38.40% | $134,275.93 | +24.18% | $29,580.86 | +14.21% (IDXX) | IDXX |
| 2005 | +16.20% | $156,026.46 | +10.75% | $32,760.13 | +5.45% (IDXX) | IDXX |
| 2006 | +31.47% | $205,128.50 | +5.32% | $34,504.59 | +26.15% (IDXX) | IDXX |
| 2007 | +9.58% | $224,771.17 | +13.84% | $39,281.03 | -4.27% (SPY) | SPY |
| 2008 | +49.93% | $336,998.70 | +5.33% | $41,375.53 | +44.60% (IDXX) | IDXX |
| 2009 | -37.99% | $208,987.86 | -36.24% | $26,382.38 | -1.75% (SPY) | SPY |
| 2010 | +46.08% | $305,285.63 | +22.65% | $32,359.23 | +23.42% (IDXX) | IDXX |
| 2011 | +28.00% | $390,752.05 | +13.14% | $36,610.39 | +14.86% (IDXX) | IDXX |
| 2012 | +10.34% | $431,143.76 | +0.85% | $36,922.44 | +9.48% (IDXX) | IDXX |
| 2013 | +17.33% | $505,881.21 | +14.17% | $42,154.69 | +3.16% (IDXX) | IDXX |
| 2014 | +13.10% | $572,148.68 | +29.00% | $54,380.19 | -15.90% (SPY) | SPY |
| 2015 | +41.17% | $807,697.69 | +14.56% | $62,298.86 | +26.61% (IDXX) | IDXX |
| 2016 | -1.01% | $799,529.13 | +1.29% | $63,101.60 | -2.30% (SPY) | SPY |
| 2017 | +64.89% | $1,318,346.10 | +13.59% | $71,674.43 | +51.30% (IDXX) | IDXX |
| 2018 | +32.98% | $1,753,086.50 | +20.78% | $86,569.38 | +12.19% (IDXX) | IDXX |
| 2019 | +17.88% | $2,066,467.04 | -5.25% | $82,026.91 | +23.12% (IDXX) | IDXX |
| 2020 | +43.12% | $2,957,451.10 | +31.09% | $107,527.02 | +12.03% (IDXX) | IDXX |
| 2021 | +88.62% | $5,578,224.77 | +17.24% | $126,059.55 | +71.38% (IDXX) | IDXX |
| 2022 | +33.90% | $7,469,016.18 | +30.51% | $164,514.60 | +3.39% (IDXX) | IDXX |
| 2023 | -35.35% | $4,828,861.24 | -18.65% | $133,838.54 | -16.70% (SPY) | SPY |
| 2024 | +36.71% | $6,601,461.31 | +26.71% | $169,585.78 | +10.00% (IDXX) | IDXX |
| 2025 | -24.51% | $4,983,308.38 | +25.59% | $212,981.61 | -50.10% (SPY) | SPY |
| 2026 | +65.47% | $8,245,952.23 | +17.66% | $250,597.02 | +47.81% (IDXX) | IDXX |
Annual returns include dividends and stock splits. Cumulative values show growth of $10,000 invested from the first year. Positive difference means IDXX outperformed SPY that year.
Company Profiles
IDEXX Laboratories, Inc.
IDXX
IDEXX Laboratories, Inc. is an American multinational corporation and a global leader in veterinary diagnostics, software, and water microbiology testing. It focuses on developing, manufacturing, and distributing products and services primarily for the companion animal veterinary, livestock and poultry, dairy, and water testing markets.
Key Innovations
- ✓Development of advanced in-clinic diagnostic instruments (e.g., Catalyst One Chemistry Analyzer, ProCyte Dx Hematology Analyzer) for veterinary practices.
- ✓Pioneering rapid assay tests (e.g., SNAP tests) for quick and accurate disease detection in animals.
- ✓Innovative solutions for water microbiology testing, ensuring safety and quality.
Business Segments
- Companion Animal Group (CAG)Provides in-clinic diagnostic instruments, rapid assay tests, veterinary reference laboratory diagnostics and consulting services, and practice management and diagnostic imaging systems for companion animals.
- Water TestingOffers products to measure microbiological parameters in water, including tests for total coliform, E. coli, and Legionella pneumophila.
- Livestock, Poultry, and DairyProvides diagnostic tests and services to detect diseases in livestock and poultry, and to monitor the quality of milk.
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.