Nasdaq Nordic: Nasdaq announces semi-annual changes to the OMX Helsinki Benchmark Index Helsinki, May 21, 2021 - Nasdaq (Nasdaq: NDAQ) announced today the results of the semi-annual review of the OMX Helsinki Benchmark Index (Nasdaq Helsinki: OMXHB) which will become effective at market open on Tuesday, June 1, 2021. The following securities will be added to the Index: Marimekko (MEKKO) Sitowise Group (SITOWS) Terveystalo (TTALO) The following security will be removed from the Index: Bittium (BITTI) The OMX Helsinki Benchmark Index measures the performance of a selection of the largest and m...