Ascential has acquired Clavis Insight for an initial cash consideration of US$119m paid plus future earn outs payable over three years.
The acquisition completed today.
Ascential said Clavis will join the group's information services division and was highly complementary to One Click Retail.
It said: 'In 2018 we will integrate Clavis with OCR's Amazon sales and share product, which, like Clavis, helps consumer product companies drive sales through eCommerce.
'This combined product suite will constitute a globally leading eCommerce performance measurement platform, to enable both companies to provide broader capabilities to their existing customers.'
Clavis employs 170 people, including 100 in Dublin, with hub locations in the US, UK, France and China serving a global customer base.
At 8:18am: (LON:ASCL) Ascential Plc share price was -0.25p at 367.85p