you don't mention a specific stack:reach ratio and most brands will sell road bikes that have higher stack:reach ratio then others
Are you looking for a pre built bike or a frameset to build up yourself? I know the XMCarbonSpeed CS-GR01 is popular. there is also a few LightCarbon frames that you can find referenced across the forum (Their website isn't loading for me right now)

I'm sure there are others but I know that Seraph sells complete gravel bikes