"作套期保值的人" can be translated into English as "hedger" or "hedging participant".
"Hedger" is a common and concise term used to describe someone who engages in hedging activities to reduce or eliminate the risk of price fluctuations.
"Hedging participant" is a more descriptive phrase that clearly indicates the person's involvement in hedging.
In most contexts, "hedger" would be sufficient and more commonly used.