I suppose, it is not a firm, but a school ("technicum") in the city of Yoshkar-Ola (Russia).
I think, that the "FGOU SPO MRMT" is the same as "FGOUSPO MRMT" and "ФГОУ СПО МРМТ" and means:

(in Russian)
Федеральное государственное образовательное учреждение среднего профессионального образования "Марийский радиомеханический техникум"

(in Romanized Russian)
Fyedyeral'noye gosudarstvyennoye obrazovatyel'noye uchryezhdyeniye sryednyego profyessional'nogo obrazovaniya "Mariyskiy radiomyekhanichyeskiy tyekhnikum"

(in English, literally)
The Federal State/Public Educational Institution of Secondary Vocational Training and Education
"The Mari Techical Secondary School of Radio Mechanics/Engineering"

Here its site (in Russian only): http://mrmt.mari.ru/

The "ФГОУ СПО" ("FGOU SPO") is a generally used abbreviation in Russia.

Actually, the "MRMT" also could be the short name of any technicum of Radio Engineering, which town's name or the state name starts from the "M": M...('s) Radio Mechanic Technicum. However, I have not found on the Internet any information about another active "MRMT".