(Bloomberg) -- BlackRock's "Core" branded U.S. ETF that's focused on Europe has been on a tear.

Assets invested in the $2.2 billion iShares Core MSCI Europe ETF (IEUR) have jumped 155% since December, the biggest increase among any U.S. product focused on the region. Assets in its larger competitor, the $12.2 billion Vanguard FTSE Europe ETF, which goes by the symbol VGK, grew about 14% over the same span.

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