Built for investment newsletter writers

Turn your investment ideas into a reason to subscribe.

Create private indexes for your paid Substack readers. Share your portfolio, investment theses, positions and updates in one place — while using Altis to convert new readers into paid subscribers.

Free for contributors.

Create your first index Book a 30-min call

Your research lives on Substack.Your investment ideas can live on Altis.

Your readers already pay for your analysis.

Altis gives them a simple place to follow what you actually own, track your investment theses and receive updates when something changes.

And when someone discovers one of your private indexes on Altis but doesn’t have access, we send them directly to your Substack paid subscription page.

  • You keep the subscriber.
  • You keep the revenue.
  • Altis simply becomes another reason to subscribe.

Private indexes

Give paid subscribers more than another email.

Create indexes exclusively for your paying readers. Instead of searching through old newsletter editions, they always have a live version of your investment idea.

  1. 01Follow your positions in one place
  2. 02Track performance over time
  3. 03See when you add or remove a position
  4. 04Follow the evolution of an investment thesis
  5. 05Receive updates when something changes

New subscribers

Turn Altis discovery into paid Substack subscribers.

Your private indexes can also help you acquire new subscribers. When an Altis user discovers your index:

  1. 01

    They discover your thesis

    They can see the idea, description and enough context to understand what you’re tracking.

  2. 02

    They click to unlock it

    If they’re not already one of your members, Altis redirects them to your Substack paid subscription page.

  3. 03

    They subscribe on Substack

    The subscription happens directly on Substack. You keep the billing, customer relationship and revenue.

  4. 04

    You give them access

    Once they’re a paid reader, they can follow your index on Altis.

For your existing paid readers

Invite your members in a few clicks.

You don’t need to move your community to Altis. Use Add Members to give your existing paid Substack subscribers access to your private indexes.

Add their email addresses and they can start following your investment ideas.

Your newsletter stays on Substack.
Altis becomes the investment layer around it.

Built for investment ideas

More than a portfolio tracker.

Not every investment writer wants to publish their entire personal portfolio. That’s why an Altis Index can represent almost anything you write about.

  • Your personal portfolio
  • A thematic basket
  • A macro thesis
  • A sector idea
  • A model portfolio
  • A trade
  • A long-term investment theme

For example

Index

AI Infrastructure

Track the companies benefiting from AI data-center spending.

Index

European Defense

Document how your rearmament thesis evolves over time.

Index

My Public Markets Portfolio

Share the portfolio behind your newsletter.

You decide what you want to show.

Two ways to publish

Build a track record or document your research.

Transparent track record

Locked Index

Built for creators who want to build a transparent track record. Trades, prices and timestamps are locked when published. Readers can see exactly how the index evolved over time.

Best for

  • Public portfolios
  • Model portfolios
  • Track records
  • Real-time investment calls

Document a thesis

Journal Index

Built for documenting an investment thesis. Add historical positions, update your thesis and show how the idea has evolved. More flexibility. Same simple experience for your readers.

Best for

  • Research themes
  • Macro theses
  • Sector baskets
  • Long-term ideas
  • Historical portfolios

Why Altis

Built for investment writers — not just investors.

A spreadsheet can show positions. Altis helps you turn them into a product for your audience.

Live performance

Readers can follow how your index evolves instead of relying on occasional screenshots.

Trade history

Document entries, exits and changes over time.

Multi-market portfolios

Track stocks across different exchanges, countries and currencies.

Thesis + portfolio together

Explain the investment idea and connect it directly to the assets you’re tracking.

Private access

Choose exactly who can access each index.

Subscriber conversion

Send users who want access directly to your Substack paid subscription page.

Member updates

Give readers a reason to come back whenever your thesis or positions change.

How to start

Publish your first index in minutes.

  1. 01

    Create your contributor account

    Publishing on Altis is free.

  2. 02

    Create an index

    Add your thesis, positions and description. Choose Locked or Journal.

  3. 03

    Make it private

    Connect the unlock button to your Substack paid subscription page.

  4. 04

    Add your paid members

    Use Add Members to invite your existing subscribers.

That’s it. Your readers can now follow your investment ideas on Altis.

Give readers another reason to become paid subscribers.

Publish your portfolio, track your investment theses and give your audience a better way to follow your ideas over time.

Free for contributors.

Create your first index Book a 30-min call