This is the 783rd most frequent Finnish word.
pörssin
"Of the stock exchange."
Here, 'pörssin' shows belonging, as the bulletin board is associated with the stock exchange.
Pörssin ilmoitustaululla oli uusia tiedotteita.
There were new announcements on the stock exchange's bulletin board.
Here, 'pörssin' is in the genitive form, indicating possession, and it translates to 'of the stock market', referring to its values.
Pörssin arvot nousivat tänään huomattavasti.
The stock market values rose significantly today.
In this sentence, "pörssin" is in the genitive case, indicating possession, and it refers to 'the stock market.' The word 'pörssin' specifies that the indices belong to the stock market.