The move is seen as part of Integrity360’s plan to have a “twin strategy” of organic growth and acquisitions.
Integrity360 started a UK operation in 2012 and has offices in London and Birmingham.
Metadigm was founded in 1989 and expects to see turnover hit £3 million in 2017.
Eoin Goulding, CEO at Integrity360 said: “It’s fantastic to be integrating Metadigm’s expertise into our overall business, reinforcing our growth strategy and introducing a further skill set for our clients in Ireland.
“Metadigm has a strong reputation in the UK and we look forward to welcoming them to our team.
“The people and skill sets at Integrity360 are fundamental to the cybersecurity services that we deliver internationally.”
In 2016, the firm says it saw revenue jump 53 percent to £33 million.
Metadigm has already been rebranded to Integrity360.
Jason Simper, director at Metadigm, said: “This is a great opportunity for us to be part of a leading cybersecurity organisation, positioning the UK team to offer enhanced IT security services with greater reach.”