Four, I think - BIW/Navantia, Fincantieri, Ingalls and Austal. Does suggest that they have decided that the USN is after, or at least the requirements lead to, a bigger platform than the Saudi version of the Freedom LCS. That might mean trouble for Ingalls with their solution based (presumably) on the Legend Class Cutters and possibly Austal, with the Independence class's limiting displacement being apparently somewhere around 4,000 tones. Although the Independence design is probably more capable of carrying a higher deadweight than the Freedom I can't seem to find any detail of what the "stretch" to the design they are currently pushing does to that.
Austal Further Improves its Frigate Design to Better Match Latest FFG(X) Requirements - Naval News
About the best I could find on the Austal offering. Hull increased to 139m, 32 x VLS, 8 x NSM, Berthing for 183 crew, 4,000nm range, >26 knot speed and pretty much all or most (not sure my self on what is entirely mandated) of the mandated government requirements/equipment/systems.
The Austal hull always did have more room for growth due to its large size but being aluminum has always been its let down in the eyes of most people. Apparently they have been continuously improving the design and may continue to do so further so dont assume this will be the end product if selected.
While the chances of Austal winning are low there is always the political part that may cause it to do so (jobs - politicians - Enough said). That said in the likely chance Austal doesnt win and they play their cards right they may be able to offer one of the previous designs with the 16 x VLS as a refit option to the existing Independence class LCS fleet depending on the level of modifications required and risk involved plus cost.
On a side note I never did understand why Austal went with such a massive helicopter pad, Always seemed like a massive waste of spacethat they could have set aside for 'optional' weapons and systems that would have given them even better chances of wining more orders.
In regards to the LCS and the mandate for the Navy to down select to one variant this year based on the last few contracts is it just me or does it seem to be going straight to Austal with the Independence class?