@SkyNetRising that's just the manufacturer/brand of whoever made the DIMM. It seems the OP wants to see the manufacturer of the actual memory ICs.
@Jawd000 I'm not sure that information is reported in software utilities. If you're able to see the chips on your DIMMs (i.e. don't have a heatspreader, or it's removable), you may be able to just read off the model number printed on one of the DRAM packages and google it.
Edit: could give this a try: https://www.reddit.com/r/Amd/comments/616gck/fyi_easy_way_to_check_ram_manufacturer/