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| Helsingin pörssi, Helsingforsbörsen | |
| Type | Stock exchange |
|---|---|
| Location | Helsinki, Finland |
| Founded | October 7, 1912; 113 years ago (October 7, 1912) |
| Owner | Nasdaq, Inc. |
| Currency | Euro |
| No. of listings | 134 Main Market and 50 Nasdaq First North companies (as of April 2024) |
| Indices | OMX Helsinki 25 |
| Website | www |
Nasdaq Helsinki, formerly known as theHelsinki Stock Exchange (Finnish:Helsingin Pörssi,Swedish:Helsingforsbörsen), is astock exchange located inHelsinki, Finland. Since 3 September 2003, it has been part ofNasdaq Nordic (previously calledOMX). After the OMX merger, it was referred to asOMX Helsinki (OMXH), then afterNASDAQ's acquisition of OMX in February 2008,NASDAQ OMX Helsinki, and currentlyNasdaq Helsinki.[1][2]

The Helsinki Stock Exchange was founded during the era of theGrand Duchy of Finland in 1912.[2][3]
The Helsinki Stock Exchange saw its first transaction on October 7, 1912.[4] From then it remained a "free form" financial association until in 1984 it was converted into acooperative owned mostly bybanks,traders, othercompanies andassociations.
The exchange went through a colorful history, including significant growth duringWorld War I, when the number of companies nearly multiplied tenfold due toRussian Empire's wartime demand. The exchange's performance and returns have been volatile, experiencing bubbles, downturns, impacts of wars, Finnish independence, the civil war, economic crises, and technological development.[2]

On April 1, 1990, trading was moved to a new digital system:HETI (Helsinki Stock Exchange Automated Trading and Information System, and in Finnish a roughbackronym for "immediately"), which replaced the electro-mechanical trading system originally introduced back in 1935. HETI enabled remote traders to conduct transactions on equal terms with those in thetrading room.
The cooperative changed to alimited liability company (Helsingin Arvopaperipörssi) in the fall of 1995 and merged with severalclearing andstock deposit companies and associations at the beginning of 1997. During 1997 and 1998 the Stock Exchange bought both of the Finnishderivative exchanges and merged them with itself to becomeHEX. In November 1998 HEX merged withArvopaperikeskus to form Helsinki Exchanges Group Plc, which then changed its name to HEX Plc in the spring of 2001. In 2001 and 2002 HEX acquired a majority share of theTallinn Stock Exchange and theRiga Stock Exchange.
On 3 September 2003, HEX Plc merged with OM AB, owner of theStockholm Stock Exchange, to become OM HEX. A year later, the company was renamed to OMX.
OMX Helsinki 25 (OMXH25) is the leading share index on Nasdaq Helsinki. It is amarket value weighted index that consists of the 25 most-traded on Nasdaq Helsinki. OMXH25 was earlier known by its old name,HEX25.[5]
Normal trading sessions are from 10:00 am to 6:30 pm on all days of the week except Saturdays, Sundays and holidays declared by the Exchange in advance.[6]
60°10′06″N24°56′57″E / 60.1684°N 24.9492°E /60.1684; 24.9492