Other Wall Street heavyweights on the list are Jamie Dimon, the chief executive of JPMorgan Chase, and Adebayo Ogunlesi, a former Credit Suisse executive who is the chairman of the investment firm Global Infrastructure Partners. Mr. Ogunlesi is also a board member at Goldman Sachs. No Goldman executives were named to the forum.

Forum members with ties to the finance industry include Paul S. Atkins, a former commissioner of the Securities and Exchange Commission who is now the chief executive of a finance regulation consulting firm, and Kevin Warsh, a former Morgan Stanley executive and a former governor of the Federal Reserve.

Mr. Fink’s presence is somewhat eyebrow-raising given his ties to the Democratic Party. He had sometimes been bandied about as a potential Treasury secretary in a Hillary Clinton administration, though his status as the head of the world’s biggest asset management firm made that seem politically unlikely. Mr. Trump is an investor in a fund managed by BlackRock.

Mr. Dimon is easier to understand. Though initially a supporter of President Obama, the JPMorgan chief has long been critical of the current administration’s financial regulatory overhaul. While his name had been floated as a potential candidate for Treasury secretary, people close to him have insisted that he had no interest in taking on a full-time commitment outside of his bank.

Aside from Virginia M. Rometty of IBM, there is hardly any representation of technology companies, and certainly none from Silicon Valley.

Perhaps that’s unsurprising, given Mr. Trump’s slim public support in the Bay Area. Among his biggest champions is Peter Thiel, the PayPal co-founder and Facebook board member, who is now a member of the Trump transition team.

Indeed, many Silicon Valley luminaries have opposed Mr. Trump since the presidential campaign. Eric Schmidt, the executive chairman of Google’s parent company, Alphabet, was an enthusiastic supporter of both Mr. Obama and Mrs. Clinton.