Arithmos builds a portfolio from one sentence. Make your own version of this one, or start from scratch.
S&P 500 Top 3, Fixed-Weight Mega-Cap Index (50/30/20)
By dddMade 16 Jul 20263 companies
Key numbers
For the time range selected above.
- vs the S&P 500
- Average per year
- Biggest drop
- Ups and downs
About this portfolio
50% #1 S&P 500 Holding 30% #2 S&P 500 Holding 20% #3 S&P 500 Holding Rebalanced Monthly. Last 20 years or up until you have enough data
- How much of each
- Hand-picked amounts
- Most in one company
- 50%
- Refreshed
- Every 3 months, next 16 Oct 2026
What’s inside
3 companies. The biggest is NVDA at 50%. No company can be more than 50%.
Percentages are target weights at the last rebalance.
Weighting: fixedLimit per company: 50%Rebalance: quarterly
Company pages
Each company’s price history, and the other portfolios that hold it.
More detail
Everything else we know about this portfolio. Open any section to dig in.Pro view: every section is open. Switch to Simple at the top of the page to tidy them away.
Risk-adjusted returns for each company, what drove the results, and how the AI built this portfolio are in Pro view.
The Sharpe ratio for each company, a suggested re-weighting and what drove the returns come with the Pro plan.
See ProAbout S&P 500 Top 3, Fixed-Weight Mega-Cap Index (50/30/20)
What stocks are in S&P 500 Top 3, Fixed-Weight Mega-Cap Index (50/30/20)?
It holds 3 companies. The largest are NVDA, AAPL and GOOG.
How has S&P 500 Top 3, Fixed-Weight Mega-Cap Index (50/30/20) performed?
+2.1% since it was made, +18.7% over the past year against +14.4% for the S&P 500, +655.3% over five years in the backtest. Results before the creation date are simulated from real past prices and leave out fees and taxes. Past performance is not a guide to the future.
How is S&P 500 Top 3, Fixed-Weight Mega-Cap Index (50/30/20) weighted?
Each company's share was set individually from the data. No company can be more than 50% of the portfolio. The biggest holding is NVDA at 50.0%.
Can I invest in S&P 500 Top 3, Fixed-Weight Mega-Cap Index (50/30/20)?
It is not a fund you can buy. It is a list of shares you can buy yourself at your broker, and Arithmos shows you how for more than 40 brokers, or creates it as a Trading 212 pie. Arithmos is a research tool, not investment advice.
Similar portfolios
- Owner Earnings 15% IRR Portfolio, SBC Adjusted, Growth Capped at Trimmed 4 Year Average3 of the same companies, 37 in total
- AI Companion Mass-Market Beneficiaries, Scale & Growth Tilted3 of the same companies, 12 in total
- AI Companion Mass-Market Beneficiaries, Compute & Consumer Ecosystem (Size/Growth Blend)3 of the same companies, 8 in total
- Pelosi Portfolio Index, Mega-Cap Tech Leaders (Size-Tilted, 12% Capped)3 of the same companies, 14 in total
- S&P 500 Top 3 by Market Cap, Fixed 50/30/20 Quarterly Rebalance3 of the same companies, 3 in total
- Sequoia Capital Public Portfolio Index, Size-Tilted3 of the same companies, 15 in total
Discussion
Results before a portfolio’s creation date are simulated from real historical prices and don’t include fees, taxes or trading costs. How we calculate performance. Nothing here is investment advice.
