Contact
We answer every email — usually within one business day.
When to email us
- You signed up but indicator access isn't active after 24 hours
- Trouble with the Stripe customer portal or billing
- Request to add a specific US-listed ticker
- Found a data error or value that looks off
- Feature requests and product feedback
- Press / partnership inquiries
Self-service first
Many common questions are answered on our FAQ page. Take a look there first — it may save you a few minutes.
US Stock Sigma is operated by Sigma Tech Communications LLC. Mailing address available on request.