I have fully-vested options in a private company which expire in Dec 2023. A company has reached out to me saying they have a buyer for the shares. The shares are worth > $300k.I'd like to sell because they expire in Dec 2023 and I don't know if there will be a liquidity event before then, however they want to take a 5% cut.Is this a normal cut for a middleman in this type of transaction? Is there a way I can connect with a buyer directly to avoid giving a % to a middleman like this?