We hear the new CEO is Matias Tarnopolsky, presently head of Cal Performances and past head of artistic planning for the Chicago Symphony and the New York Philharmonic.
An announcement is said to be imminent.
Tarnopolsky was due to succeed last year at the Philharmonia Orchestra in London but a last-minute hitch unravelled the deal.
Philadelphia were also considering Cressida Pollock, outgoing CEO of English National Opera.
UPDATE: Peter Dobrin reports from Philly that the orchestra has a verbal agreement with Tarnopolsky; all that remains is for the board to confirm it, which will probably happen today.