IFK Mariehamn were relegated from the Veikkausliiga after drawing with Jaro, while HJK moved to within one point of leaders Inter Turku by thrashing Gnistan in the Helsinki derby.
The result also left Jaro facing a relegation play-off for a place in next season's Veikkausliiga.
Mariehamn go down
Mariehamn were relegated after drawing with Jaro. Flashscore said IFK Mariehamn had spent 22 seasons in the Finnish top flight.
Flashscore also said there will be no representative from the Aland Islands in the 2027 Veikkausliiga.
Jaro finished the season two points clear of Mariehamn and will play PK-35 over two legs for a place in next season's Veikkausliiga.
Ville Vuorinen put Jaro into the lead in the 64th minute. Mariehamn equalised with 11 minutes to play when Gergo Kocsis diverted the ball into his own net.
HJK cut the gap
Inter Turku lost at home to AC Oulu, while HJK thrashed Gnistan in the Helsinki derby.
HJK moved one point behind Inter Turku. Mads Borchers scored a second-half hat-trick for HJK against Gnistan, and Santeri Haarala also scored.
Edmund Arko-Mensah was sent off for unsportsmanlike conduct in Gnistan's match against HJK.
AC Oulu beat Inter Turku
AC Oulu were reduced to 10 men when Miguel Santos was shown a straight red card.
Juuso Makelainen scored in added time to win the match for AC Oulu against Inter Turku.
Other relegation group results
Lahti beat TPS and finished top of the relegation group. TPS finished the season in ninth after four defeats in a row.
Ilves beat SJK and finished eighth, while SJK finished 10th.