HYEG
HYDROGEN ENGINE CTR INC
stockOTC

BTW - I took a quick look at HYEG. That's a company that is no longer SEC Rule15c2-11 compliant which is probably why you are unable to sell it. The company has not submitted any required regulatory filings in years so the stock is ineligible for quotation and can only transact in the OTC expert market. To surrender the shares - what some brokers will do is to charge a small fee to buy the shares for a courtesy price from you. It's would net to $0 for you. This covers the broker's risk since the broker will not likely be able to dispose of the shares.