Why is it der Börsianer?

Börsianer ends in -er, and most nouns ending in -er are masculine: in a German dictionary, 86% of them take der.

All nouns ending in -er
Sense 1
der

Meaning

[1] Someone who does business on the stock exchange

[1] jemand, der an der Börse Geschäfte macht

Examples

[1] "He was sitting around in the halls of the luxury hotels, in the bars of the city, in the cafés, where the Börsians sat"

[1] „Er saß herum in den Hallen der Luxushotels, in den Bars der Stadt, in den Cafés, wo die Börsianer saßen.“

[1] "Evas Börsian had Peche"

[1] „Evas Börsianer hatte Pech.“

Declension

1 Singular Plural
Nominativ der Börsianer die Börsianer
Genitiv des Börsianers der Börsianer
Dativ dem Börsianer den Börsianern
Akkusativ den Börsianer die Börsianer

Pronunciation

Dictionary entries include material from Wiktionary. Wiktionary