Is it possible to submit a proposal for an Ambizione grant in parallel with a proposal for an Advanced Postdoc.Mobility fellowship?

No, according to article 13 of the Ambizione Regulations, proposals for an Ambizione grant may only be submitted for a duration for which no other project grants have been requested or approved or are ongoing under the project funding scheme or programmes of the SNSF. For the fellowship's holders who are already abroad with an Advanced Postdoc.Mobility fellowship, it is however possible to submit a proposal for a return phase to Switzerland in parallel with a proposal for an Ambizione grant.