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AI that invests in your ideas

Type an idea. See the companies. That’s it.

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Arithmos never holds your money or places trades.

Or type an idea and build one now.

Try:

Picks only listed shares from 23 stock markets, including the US, the UK, Europe, India and Japan. See the full list

AI portfolio builder

Turn any investing idea into a ready-made portfolio

Type what you want to invest in. Arithmos picks the companies, decides how much of each, and shows how that mix would have performed. You see the reason for every pick.

Try:

Picks only listed shares from 23 stock markets, including the US, the UK, Europe, India and Japan. See the full list

  • See every company and why it's there
  • Works with your existing broker

Arithmos is a research tool. It never holds your money or places trades, and nothing here is personal advice.

How it works

From an idea to a ready-made list of companies in about a minute.

  1. 1

    Describe it

    Type what you want to invest in, the way you'd explain it to a friend. “Companies making AI chips”, “UK firms that pay reliable dividends”.

  2. 2

    We build and test it

    Our AI picks the companies, decides how much of each to hold, and shows how the mix would have done against the S&P 500.

  3. 3

    Invest your way

    Save it, share it, or copy it into your own broker. You stay in control: Arithmos never trades for you.

Top performing portfolios

Just shared

Top builders this month

Coming soon

Live trading of the portfolios you build on Arithmos

Soon you’ll buy every company in a portfolio in one go, without leaving Arithmos. Join the waitlist to be first in. Until then, use your live demo trading account with $50,000 of demo money.

Demo trading uses test money only. Live trading will open once the right approvals are in place. Not investment advice.

Copy our pies on Trading 212Our portfolios are on Trading 212 as public pies. Open one and copy it into your own account in a tap.Not investment advice. Capital at risk.

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“How do I invest in…?”

Short, plain-English answers, plus a free starter course if you are new to all of it.

All guides
data fabriclive screens & fundamentals fan out across all sources with automatic fall-throughAttribution under nominative fair use. No endorsement or partnership implied.
Financial Modeling PrepTiingoFinnhubTwelve DataAlpha VantagePolygon.ioStooqFinancial Modeling PrepTiingoFinnhubTwelve DataAlpha VantagePolygon.ioStooq+ others

A research tool, not investment advice. Past performance doesn't guarantee future results. Learn more