Why is it der Distributor?

Distributor ends in -or, and almost all nouns ending in -or are masculine: in a German dictionary, 93% of them take der.

All nouns ending in -or
Sense 1
der

Meaning

[1] Sales Society

[1] Vertriebsgesellschaft

Examples

[1] The distributor was bribed, hence the control necessary

[1] Der Distributor war bestochen, daher die Kontrolle notwendig.

Declension

1 Singular Plural
Nominativ der Distributor die Distributoren
Genitiv des Distributors der Distributoren
Dativ dem Distributor den Distributoren
Akkusativ den Distributor die Distributoren

Pronunciation

Dictionary entries include material from Wiktionary. Wiktionary