The dollar amount of the acquisition was not specified.
The 25% stake acquired by NBC News will be backed by funding supporting expanded news coverage and programming across Europe.
" Euronews has unmatched scale as well as the unique ability to offer international coverage rooted in sensibility in every country and language it spans," NBC News Chairman Andrew Lack said.
Euronews employs nearly 500 journalists and reaches 434 million homes across 158 countries in 12 languages on both TV and digital platforms.
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