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I'm glad to help you with your inquiry about public companies with a stock symbol starting with "H1" on a US stock exchange. However, I must clarify that there is no stock exchange that uses "H1" as a stock symbol prefix. It seems there may be some confusion about stock symbol conventions.

In the US, the two major stock exchanges are the New York Stock Exchange (NYSE) and the NASDAQ. Both exchanges use a variety of letter combinations for stock symbols, but there is no specific "H1" classification.

If you have any other questions or if there is a specific company or topic you would like me to research, please let me know. I apologize for any confusion my initial response may have caused.