CEMEX makes cement [Portland], not concrete.
They make and distribute concrete too, I test lots of it. They’ve bought and consolidated a bunch of lesser American operators in the west AFAIK.
They have concrete solutions too... ;)
CEMEX is a concrete supplier here in Arizona. It is (or was in the beginning) a Mexican owned company using Mexican sourced cement. They came into Phoenix soon after Nafta was signed and bought out one of the 3 main concrete companies in town, we were in a housing boom at the time, I put 200k miles on a brand new truck in 18 months time doing inspections all over this valley.
As an inspector at the time, I could point out the slabs that they supplied concrete for, it was much darker grey than US sourced portland. We took test cylinders regularly and it was always behind the curve on early yields. That only mattered because we were doing post tension slabs and concrete had to be a certain strength before it could be stressed. Mix designs showed it took more of their cement in a mix design to achieve the same final strength concrete. finishers loved it though... was much easier to work, thdey said it was extra creamy.
An article i read last night said they were also the suppliers of the concrete in the pedestrian bridge that failed in Florida not too long ago.