Magnificent 7 Stocks Calculator: Historical Backtest

What is a Magnificent 7 stocks backtest

A backtest replays your contribution schedule against actual historical prices to show what would have happened, not what will happen. This calculator uses monthly closing prices from Yahoo Finance to compound returns period by period. The result is a year-by-year record of how your invested amounts interacted with real market movements for the stock you selected.

How the model builds your results

Each month the calculator first adds your contribution for that month, then applies the stock's actual price change to the running balance. Contributions across all frequencies are converted to an equivalent monthly flow before being added.

• Returns: derived from consecutive monthly closing prices. A month where the stock rose 10% adds 10% to your balance, including that month's contribution. The first month uses the closing price of the previous December, so its move is not skipped.
• Compounding: applied every month to the full running balance including past growth. Growth earns growth from the next month onward.
• Contributions: seven frequencies are supported: daily (365/yr), weekly (52/yr), biweekly (26/yr), semimonthly (24/yr), monthly (12/yr), quarterly (4/yr), and annual (1/yr). Each is normalized to an equivalent monthly amount before being added to the balance.
• Dividends: when dividend reinvestment is off (default), results reflect price returns only. When it is on, the selected stock's dividend payments are added to that month's rate and compounded. The dividend column in the yearly table shows the dividends paid in each year, whether or not you reinvest them.
• Extension: if your end year goes beyond the last available data point, the assumed annual return you enter is converted to a monthly rate and applied from that point onward.

Supported stocks and date coverage

The calculator covers all seven stocks in the Magnificent 7: Apple (AAPL) with data from December 1980, Microsoft (MSFT) from March 1986, Amazon (AMZN) from May 1997, NVIDIA (NVDA) from January 1999, Alphabet (GOOGL) from August 2004, Tesla (TSLA) from June 2010, and Meta (META) from May 2012. Because the first January of a backtest starts from the previous December close, the earliest start year is the year after the data begins: 1981 for Apple, 1987 for Microsoft, 1998 for Amazon, 2000 for NVIDIA, 2005 for Alphabet, 2011 for Tesla and 2013 for Meta. The start year moves to that year when you switch stocks. For comparisons across all seven, a common start year of 2013 or later covers every stock.

Worked example

Suppose you started with $1,000 and added $100 per month in Apple stock from January 2015 to December 2024. Over those 10 years you would have made 120 monthly purchases on top of your starting amount. Each month the calculator first adds your $100, then applies that month's actual AAPL price return to the running balance, and tracks the outcome year by year. The yearly breakdown lets you see exactly which years, including the strong bull runs of 2019 and 2020, contributed most to the final portfolio value.

Stock volatility and what it means for your results

The Magnificent 7 are large-cap technology stocks, but they are still significantly more volatile than broad index funds. NVIDIA lost approximately 50% of its value in calendar year 2022, then returned roughly 239% in 2023. Meta fell about 64% in 2022 alone before recovering strongly in 2023. Tesla dropped around 65% in 2022. These swings appear in the yearly breakdown as large positive or negative growth rows. A longer backtest window averages across multiple market cycles and usually produces a more stable trend line than a single-year view.

Dividend reinvestment

Toggle "Reinvest dividends" under More options to add real per-share dividend payments to your monthly compounding. Apple currently pays $0.27 per share per quarter (roughly 0.3% a year at the October 2026 price); Microsoft pays $0.91 per share per quarter (roughly 0.7% a year). Alphabet ($0.22) and Meta ($0.525) have paid a quarterly dividend since 2024, each yielding roughly 0.3% a year. NVIDIA raised its quarterly dividend from $0.01 to $0.25 per share in 2026, about 0.5% a year at the October 2026 price. When the toggle is on, each dividend payment is expressed as a yield fraction of the previous month's price and added to that month's return, then compounded into the running balance. From January 2006 to December 2025, starting with $1,000 and adding $100/month in Apple, reinvesting dividends lifts the final balance from about $624,900 to about $733,800, roughly $108,900 more than price-only, because every reinvested dividend buys shares that then share in Apple's later price gains. Amazon and Tesla pay no cash dividend; enabling the toggle for these two stocks has no effect.

Transaction costs

Use the "Transaction cost" field under More options to model a flat brokerage fee charged each time a contribution event occurs. The fee is deducted from the effective contribution before it is added to the balance, so it reduces both the principal and the compounding base. A $5 fee on a $100 monthly contribution means only $95 is invested each month. The fee stays the same when your contributions rise with the annual increase. Over 20 years at monthly frequency that is $1,200 in foregone principal, not including the opportunity cost of that capital not compounding. At quarterly frequency the same $5 fee costs only $400 over 20 years, since there are four events per year instead of twelve. Most major online brokers now offer commission-free US stock trading, so for many users this field will remain at zero.

Annual increase

The "Annual increase type" field under More options lets you model growing contributions over time, a common pattern when income rises with career progression. Two modes are available:

• Percentage: contributions compound annually. At 3% per year, a $100/month base becomes $103/month in year 2, $106.09 in year 3, and so on. Over 20 years the final-year monthly contribution reaches approximately $175.
• Fixed amount: each contribution increases by the same amount every year. On a $100/month plan, a $50 increase adds $50 to every monthly contribution each year: $150/month in year 2, $200/month in year 3. Unlike the percentage mode this increase is additive, not multiplicative.

Extending the projection beyond historical data

Set "Return after backtest" to a percentage if you want to continue the projection past available history. A 7% annual assumption converts to approximately 0.57% per month. Setting it to 0% freezes market growth after the data ends and only adds contributions. Try 0%, 5%, and 10% to see how sensitive the long-term outcome is to your assumed future rate.

Reading the results

• The yearly breakdown table shows contributions deposited and market-driven growth for each calendar year, plus the year-end balance.
• The stacked chart splits total value into starting amount, cumulative contributions, and cumulative growth at each year-end. When the growth slice exceeds contributions, compounding is doing most of the work.
• The summary panel shows your final portfolio value, total amount contributed, and total growth so you can immediately see the return above cost.

Usage tips

• Compare stocks over the same window: keep start and end year fixed, then switch stocks to see how different Mag 7 companies behaved under the same contribution schedule.
• Use longer horizons: windows of 1 to 2 years are often dominated by a single market cycle. Windows of 5 years or more show compounding and cost-averaging working together.
• Test future scenarios: extend the end year beyond available data and try different assumed returns to explore the range of possible outcomes.
• Reinvest dividends: enable the dividend toggle for a dividend payer such as Apple or Microsoft under More options to see the historical total return including dividends.

Important limitations

• Prices come from Yahoo Finance monthly closing data and reflect split-adjusted prices. By default results show price returns only. Enable dividend reinvestment under More options to include per-share dividend data for the five Magnificent 7 stocks that pay one.
• Only the flat transaction cost you enter is modeled. Percentage-based commissions, capital gains taxes, and spread costs are not. On a $100/month plan with a 0.05% fee, that is $0.05 per trade, small individually but compounding over many years.
• Currency display is for visual context only. Historical foreign exchange rates are not reconstructed, so numbers assume you held and measured in USD throughout.
• Past stock performance does not predict future returns. A stock that returned 500% over one decade may behave very differently in the next.
• Concentration risk: investing in a single stock carries significantly higher risk than a diversified portfolio. The Magnificent 7 represent a narrow slice of the market despite their large combined weight in major indices.

Supporting calculators

• Real purchasing power: use the Inflation Calculator to translate your historical Mag 7 portfolio values into today's purchasing power and understand what your nominal gains are worth in real terms after decades of price rises.
• Valuation check: use the P/E Ratio Calculator to see how richly these stocks are priced today, with the P/E, forward P/E and PEG ratio set against the long-run market average.
• Digital asset comparison: use the Crypto Investment Calculator to backtest the same DCA schedule on Bitcoin or Ethereum and see how alternative digital assets compare to Magnificent 7 price performance.

Learn more

• Data transparency: read the Data Guide to understand where stock price data comes from, how monthly price history is updated, and how it is converted into calculator results.
• Backtesting methodology: read the Backtesting Guide for how monthly backtesting works across every calculator on this site, dollar cost averaging versus lump sum, and common pitfalls like survivorship bias.