A departure is a vacancy before anyone writes the advert
When a head of function resigns, the company has a problem that day and an advert some time later, if there is an advert at all. In between, someone senior decides whether to promote from within, ask a search firm, or wait. That conversation is over by the time the role is public.
The seat is rarely the only one. A leader who goes takes knowledge with them and often people too, and whoever replaces them will reshape the team. One departure at an account you care about can mean a run of hires.
Reaching a new leader before they choose their recruiters works the arrival. This play works the exit, on a list of accounts you chose, and it is honest about how little of it is visible.
What you get back
A table of your accounts. For each detected departure: the person, the role they held, the date, and how it was found, whether a news event, a confirmed move or an advertised seat. Any backfill role comes with its link and the date it was first seen. For those accounts, the leader's manager or the HR lead with a verified work email, and a short draft about the seat. Accounts with nothing detected are listed as checked. Nothing is sent.
Variations worth knowing
Name the leaders up front. The check on a named person is the most direct of the three methods, because it does not wait for anyone to announce anything. An account list with the head of your function named at each is the best input this play can have.
Watch for the successor. If the seat is filled from within, a promotion shows in the same news source. That closes this lead and opens a different one: the promoted person's old seat.
Follow the leader too. Where they land is a lead of its own. If they were a client contact, see follow your client contacts when they move company.
Where this goes wrong
Silence read as stability. Most departures never reach the news, and profiles go stale. An empty result means nothing was found, which is a weaker statement than nothing happened.
An interim is already in the chair. Many companies cover a senior gap with a deputy or an interim straight away. The backfill is still coming, but the urgency you assumed may not be there.
Writing about the person. A note that names who left, or guesses at why, reads as gossip. Write about the function and the team.
The search is already placed. Senior backfills go to retained search quickly. If the signal is weeks old, ask about the team around the seat, not the seat.
No HR lead to find. At a small company the manager above the seat is a founder. The search says so, and does not return a junior administrator as the contact.