| Detail | Matiční gymnázium, Ostrava, příspěvková organizace | 00842761 | Territorial self-governing unit or its contributory organization | CZ080 | Detail |
| Detail | MATTECH, s.r.o. | 47973064 | Another entity | CZ080 | Detail |
| Detail | MATURE TEPLICE s.r.o. | 60490420 | Czech Republic | CZ042 | Detail |
| Detail | MAX SERVISNÍ CENTRUM s.r.o. | 15051927 | Another legal entity | CZ010 | Detail |
| Detail | MAZÁK Invest s.r.o. | 01385623 | Czech Republic | CZ | Detail |
| Detail | MBG, spol. s r. o. | 47973773 | Another legal entity | CZ071 | Detail |
| Detail | MCU KOLOSEUM, o.p.s. | 25405080 | Another legal entity | CZ051 | Detail |
| Detail | M-DOST s.r.o. | 09862021 | Czech Republic | CZ010 | Detail |
| Detail | MEBSTER s.r.o. | 06947549 | Another legal entity | CZ010 | Detail |
| Detail | MEDEXIM Ostrava s.r.o. | 60777621 | Another legal entity | CZ080 | Detail |
| Detail | MEDIA EFEKT, s.r.o. | 25518640 | Czech Republic | CZ064 | Detail |
| Detail | MediaStream, s.r.o. | 27111920 | Czech Republic | CZ | Detail |
| Detail | MEDIC KRAL s.r.o. | 27372791 | Another legal entity | CZ | Detail |
| Detail | MEDICA Třinec, z.ú. | 05115841 | Another entity | CZ080 | Detail |
| Detail | MeDiLa spol. s r.o. | 63217767 | Another legal entity | CZ053 | Detail |
| Detail | MEDITERRA s.r.o. | 49686356 | Czech Republic | CZ010 | Detail |
| Detail | Medsol s.r.o. | 24201596 | Another entity | CZ | Detail |
| Detail | MEDTEC - VOP, spol. s r.o. | 64791319 | Another entity | CZ052 | Detail |
| Detail | MEDUNA vakuová kalírna s.r.o. | 28847555 | Another entity | CZ | Detail |
| Detail | Mendelova střední škola, Nový Jičín, příspěvková organizace | 00845027 | Territorial self-governing unit or its contributory organization | CZ080 | Detail |
| Detail | MENHIR Praha, s.r.o. | 27615219 | Another entity | CZ010 | Detail |
| Detail | MENS SANA, z.ú. | 65469003 | Another entity | CZ080 | Detail |
| Detail | Meopta - optika, s.r.o. | 47677023 | Another legal entity | CZ071 | Detail |
| Detail | MěPOS, příspěvková organizace | 00562238 | Territorial self-governing unit or its contributory organization | CZ080 | Detail |
| Detail | MERCI, s.r.o. | 46966447 | Another legal entity | CZ064 | Detail |
| Detail | MERKUR TOYS s.r.o. | 25997386 | Another legal entity | CZ | Detail |
| Detail | MERKURIA - ARTES a.s. | 15062465 | Another legal entity | CZ052 | Detail |
| Detail | Město Adamov | 00279889 | Territorial self-governing unit or its contributory organization | CZ064 | Detail |
| Detail | Město Aš | 00253901 | Territorial self-governing unit or its contributory organization | | Detail |
| Detail | Město Bakov nad Jizerou | 00237418 | Territorial self-governing unit or its contributory organization | CZ020 | Detail |
| Detail | Město Bavorov | 00250945 | Territorial self-governing unit or its contributory organization | CZ031 | Detail |
| Detail | Město Bechyně | 00252069 | Territorial self-governing unit or its contributory organization | CZ031 | Detail |
| Detail | Město Bělá nad Radbuzou | 00253235 | Territorial self-governing unit or its contributory organization | CZ032 | Detail |
| Detail | Město Bílina | 00266230 | Territorial self-governing unit or its contributory organization | CZ042 | Detail |
| Detail | Město Bílovec | 00297755 | Territorial self-governing unit or its contributory organization | CZ080 | Detail |
| Detail | Město Blansko | 00279943 | Territorial self-governing unit or its contributory organization | CZ064 | Detail |
| Detail | Město Blovice | 00256455 | Territorial self-governing unit or its contributory organization | CZ032 | Detail |
| Detail | Město Bor | 00259713 | Territorial self-governing unit or its contributory organization | CZ | Detail |
| Detail | Město Brandýs nad Labem-Stará Boleslav | 00240079 | Territorial self-governing unit or its contributory organization | CZ020 | Detail |
| Detail | MĚSTO BROUMOV | 00272523 | Territorial self-governing unit or its contributory organization | CZ052 | Detail |
| Detail | Město Brtnice | 00285668 | Territorial self-governing unit or its contributory organization | CZ063 | Detail |
| Detail | Město Brumov - Bylnice | 00283819 | Territorial self-governing unit or its contributory organization | CZ072 | Detail |
| Detail | Město Brušperk | 00296538 | Territorial self-governing unit or its contributory organization | CZ080 | Detail |
| Detail | Město Břeclav | 00283061 | Territorial self-governing unit or its contributory organization | CZ064 | Detail |
| Detail | Město Březnice | 00242004 | Territorial self-governing unit or its contributory organization | CZ020 | Detail |
| Detail | Město Březová | 00259250 | Territorial self-governing unit or its contributory organization | CZ041 | Detail |
| Detail | Město Bučovice | 00291676 | Territorial self-governing unit or its contributory organization | CZ064 | Detail |
| Detail | Město Budišov nad Budišovkou | 00299898 | Territorial self-governing unit or its contributory organization | CZ080 | Detail |
| Detail | Město Budyně nad Ohří | 00263427 | Territorial self-governing unit or its contributory organization | CZ042 | Detail |
| Detail | Město Buštěhrad | 00234214 | Territorial self-governing unit or its contributory organization | CZ02 | Detail |