Andreessen declined to comment about the project. Kalanick, Son and Altman did not respond to CNN requests for comment.
Others are distancing themselves from the $500 billion project, known as NEOM.
"Dan Doctoroff's inclusion on that list is incorrect," his spokesman said in a statement. "He is not a member of the NEOM advisory board."
Ernest Moniz, the former US Energy Secretary under President Barack Obama, said Wednesday he was suspending his participation on the advisory board "given current events."
"Going forward, my engagement with the advisory board will depend on learning all the facts about Jamal Khashoggi's disappearance over the coming days and weeks," he said in a statement.
Saudi Crown Prince Mohammed bin Salman announced the NEOM city a year ago, sitting alongside SoftBank's Son at an investment conference in Riyadh. Son described the plan to build an automated city of self-driving cars and passenger drones from scratch as a "fantastic opportunity."
Now, US intelligence is trying to determine whether the highest levels of the Saudi government were involved in the disappearance of Washington Post columnist and Saudi critic Khashoggi.
Saudi Arabia has strenuously denied any involvement in Khashoggi's disappearance.
"At this stage, our priority is to support the investigation, as opposed to responding to evolving comments not directly related to those efforts," a senior Saudi official told CNN on Wednesday.
"Each of the Advisory Board members has been carefully chosen," the Saudi Press Agency said in a statement on Tuesday listing the members. Additional members may be appointed, it added.
Boston Dynamics CEO Marc Raibert and former European Commission vice president Neelie Kroes have also agreed to serve on the advisory board, according to the SPA.
Sara O'Brien and Laurie Segall contributed to this article.