Bercmann
Bercmann Technologies (BERCM.RG) isn't a Latvian company but is instead an Estonian one, so the ticker should read BERCM.TL or something. Which is probably why on 19.11.2021 it appears as if the market is closed when it actually isn't (because that day is a market holiday in Latvia, but not in Estonia).
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Karin Sarv commented
It seems like the entire FIRST NORTH BALTIC SHARE LIST is impacted. All of them have Riga as exchange, doesn't matter if it's actually Tallinn, Riga or Vilnius market.
Here is the correct list. Tickers may not correspond exactly to Yahoo Finance:
Ticker Name MarketPlace
BERCM Bercman Technologies TLN
EJTC Estonian Japan Trading Company TLN
ELMO ELMO Rent TLN
EWA1L East West Agro VLN
FRGTE Frigate RIG
K2LT K2 LT VLN
LINDA Linda Nektar TLN
MDARA MADARA Cosmetics RIG
MODE Modera TLN
NEOFI NEO Finance VLN
SAUNA Saunum Group TLN
VIRSI VIRŠI-A RIG