Arithmos · Comparison

Arithmos vs an MSCI custom index

What an institutional index provider does, and why retail can't access it.

MSCI, S&P Dow Jones Indices and FTSE Russell run the index industry. They build custom indices for institutional clients, but the entry point is high. Here's how Arithmos compares.

MSCI, S&P Dow Jones Indices and FTSE Russell are the three index providers that license most of the world's investable equity benchmarks. They also build bespoke indices for asset-management clients — but the typical engagement starts in the high six figures and is gated to institutional users.

What MSCI / S&P / FTSE Russell offer

  • Decades of methodology rigour — corporate-action handling, free-float adjustment, country classification.
  • Brand: ETF issuers want the MSCI / S&P / FTSE / Russell name on their fund.
  • Custom-index research desks that will design and maintain a bespoke benchmark.
  • Long-history backtests (some MSCI series go back to 1970).

What Arithmos offers instead

  • An LLM-driven prompt-to-portfolio workflow — minutes, not weeks.
  • Transparent rules you can read on a single page.
  • A flat subscription, no minimum portfolio size.
  • An export bridge so the resulting basket can be held directly in a retail brokerage account.

FAQ

Can I license an Arithmos index for an ETF?

No. Arithmos indices are private research artifacts; ETF issuers contract with regulated index providers (MSCI, S&P DJI, FTSE Russell, Solactive, Indxx) for that.

Do Arithmos indices use MSCI methodology?

No. Arithmos uses its own selection and weighting rules, generated by the agent and explained on the index page. We do let you benchmark against MSCI World, MSCI EM, MSCI EAFE and others on the comparison chart.

Try it now

Arithmos turns a sentence into a transparent, rule-based index with institutional-grade backtests. Describe the exposure you want and the agent picks the names.

Keep reading

Arithmos · investment research & data tool · not investment advice · not a regulated broker or advisor · past performance does not guarantee future results.
Investment research & data tool · not investment advice · not a regulated broker or advisor · past performance does not guarantee future results.