Melrose has succeeded in its hostile bid to take over GKN for £8.1 billion after securing the backing of the engineering giant's shareholders.
A total of 52.43 per cent investor votes were cast in favour of the deal going ahead as of 1pm, above the 50 per cent plus 1 share threshold.
The Redditch-based engineering group specialises in the automotive and aerospace sectors, making parts for clients such as Volvo and Airbus and has plants in Erdington, Minworth and Kings Norton.
Melrose chairman Christopher Miller said in a statement: "We are delighted and grateful to have received support from GKN shareholders for our plan to create a UK industrial powerhouse with a market capitalisation of over £10 billion and a tremendous future.
"We are looking forward to working with GKN's talented workforce and to delivering for customers and all stakeholders. Melrose has made commitments as to investment in R&D, skills and people and we are very excited about putting these into action.
"Let me assure you that GKN is entering into very good hands.
The victory brings to a close a bitter battle that has raged since January, although there are likely to be renewed calls for Business Secretary Greg Clark to intervene in the deal.
He has already called for "binding" agreements over Melrose's proposals for GKN.
Mayor of the West Midlands, Andy Street , said: “The result of today’s vote by the shareholders of GKN is now known, however the real decisions on the future of the company are still to be made.
“Therefore, I’m asking the new owners for an early meeting to ensure their commitments to the West Midlands are honoured.
“That means protecting current jobs, pensions and future investment in research and development. This will ensure GKN continues to be a long-term success story in the region.”
And Labour MP for Northfield Richard Burden added: “It is bad news for UK industry that GKN shareholders have opted for the short term rather than the long term and voted for the hostile takeover by Melrose.
"This underlines why UK takeover laws need urgent reform. Even now, though, ministers can still intervene on national security grounds. The question they need to answer urgently is, will they now do so?”
Melrose has stressed its commitment to improving "not only GKN, but the UK economy", committing to keeping the firm listed in London and headquartered in the UK as part of a five-year pledge.
Mr Miller added: "We would like to thank our shareholders for their continued support of the Melrose strategy thus far. We are full of enthusiasm as we begin this next stage of the Melrose story and look forward to creating substantial value for our shareholders, old and new."
Shares in GKN rose 7 per cent following the news.
But Melrose's takeover will spark fears for jobs after Airbus, GKN's largest customer, earlier warned it could not give any new business to the firm if the deal with the turnaround specialist went ahead.
Unions and MPs have also warned over asset stripping and flagged national security concerns, claims which Melrose has rejected.
Background to take over on Midlands based engineering firm
GKN has a history that dates back to the 1900s and was instrumental in wartime manufacturing.
During the First World War, it was heavily involved in making steel for military purposes, such as shells.
After the outbreak of the Second World War, GKN produced Spitfires and specialised tanks for the D-Day landings, as well as millions of steel helmets.
GKN ultimately attempted in vain to fight off Melrose's advances, despite chief executive Anne Stevens describing the takeover as "high-risk" and the offer not coming close to reflecting true value.
Its counter measures, which included a deal to sell its automotive division Driveline to US firm Dana, fell on deaf shareholder ears.
GKN became a target following profit warnings in October and November after problems at its US aerospace division sent shares tumbling.
GKN is headquartered in Redditch and has its biggest factory in Filton near Bristol, where it employs 1454 workers.
Other plants in the UK include Cowes, Birmingham, Luton, Telford, Kings Norton, Portsmouth, Uxbridge, Leek and Oxford.
