General cost cutting without any other visible reasons. Cut backs on travel, social budgets, contractors, any other expenses that can be trimmed to make the financials look sexier.
Departments like Finance, Legal, Risk/Compliance and HR are overworked and distracted. These people, at least some of them, get involved after the execs but before everyone else. As someone else said this can start with the CFO but it'll spread to whole teams of paralegals and accountants before you are told about it.
Speaking of HR, do they suddenly want everyone to sign contract addendums or "compliance papers" or whatever? Asking you to fill out a "skills inventory"? Everyone got to get background checks?
Sales teams rushing to finish deals (to sexy up financials) and clear their comp (before the new boss brings new rules). I guess this isn't really that different from BAU.
As has been pointed out these things can all have other causes. But all together, all at the same time, without any stated reason....
Unfortunately ICs are often the least plugged in politically and end up the last to know. The compensation is being retained, unlike everyone else above who heard it through the grapevine before you.