The two banks entered into the merger agreement on Sunday (19 March), although it remains subject to customary closing conditions.
The surprise announcement had come to the fore late on Friday with both sides working over the weekend to reach an arrangement.
https://citywire.com/new-model-adviser/news/ubs-to-acquire-credit-suisse-in-emergency-rescue/a2412164?re=107225&refea=1889495