The invitations to Sunday's Christmas reception did not include Nusseibeh's official title, unlike the invitations to the Eid al-Fitr event, his spokesman said.
One of the four, Ami Ayalon, has teamed up with a prominent Palestinian, Sari Nusseibeh, to produce a blueprint for peace that includes a full Israeli withdrawal.
But back at Hermes Fund Managers, Saker Nusseibeh has doubts about the wider usefulness to society of doing something as simple as investing in a stock market index in such an extremely complex way.