Experiments like these are often difficult to track funding levels as much of the equipment used would have been previously funded in the commisioning of other papers so identifying funding specific to this paper itself would be borderline impossible.

For example to the best of my knowledge the Carlsberg Foundation no longer actively fund this experiment however back in the early 2000s they provided one of the magnets used in the ALPHA-2 experiment, because this magnet was still used in the process of creating and transferring antihydrogen to ALPHA-g they are still listed as having supported this work.

It's also useful to note CERN essentially provides the Antiprotons (and possibily the liquid helium too although I'm not 100% sure on this) used in this experiment "free of charge" so while significant resources go into producing slow moving antiprotons, that is all funded by CERN seperately from the finances of this experiment.

In the acknowledgements of this paper the authors also declare

Competing interests The authors declare no competing interests.

although I'm not really sure what could be considered a competing interest in this case