OMX AB（AktieBolaget OptionsMäklarna/Helsinki Stock EXchange）是一家跨国金融服务公司，OMX AB由OM AB和HEX plc于2003年合并而成，在2008年2月成为了纳斯达克OMX集团旗下子公司。OMX AB有两个分支机构：在北欧和波罗的海国家运营着8个证券交易所的“OMX 证券交易所（OMX Exchanges）”和为OMX和其它证券交易所研发所用作金融交易服务的市场分析系统的“OMX科技（OMX Technology）”，同时，OMX科技也是全球领先的金融工具交易系统开发商。

OMX AB (Aktiebolaget Optionsmäklarna/Helsinki Stock Exchange) is a Swedo-Finnish financial services company, formed in 2003 through a merger between OM AB and HEX plc and is a part of the NASDAQ OMX Group since February 2008.

It has two divisions, OMX Exchanges, which operates eight stock exchanges mainly in the Nordic and Baltic countries, and OMX Technology, which develops and markets systems for financial transactions used by OMX Exchanges, as well as by other stock exchanges.