AKT, which provided all the experimental engineering work to Zaha Hadid's Stirling-nominated Phaeno Science Museum in Germany, has been snapped up by WYG for an undisclosed sum.
The move will leave the construction and engineering industries shocked - there had been no indication that such a deal was in the offing.
AKT director Hanif Kara ( pictured in the foreground) said his practice has blazed a trail in engineering, and that this deal would allow for further progression.
'AKT has successfully cut a 'design-led' route through the market over the past 10 years by growing a culture that is renowned for frequently challenging the norm, attacking complacency and encouraging inquisitiveness,' said Kara.
'We strongly believe that fusing with WYG is a natural step which will allow our 'adaptive cell' to satisfy its needs and secure the talent of our second and third generations while working with WYG to achieve the more complex task of ensuring a sustainable, but dynamic, intellectual and physical growth,' he added.
Formed in 1996, AKT has been growing every year, with an annual turnover of approximately £8 million and more than 100 employees.
In contrast, WYG employs more than 2,500 staff and has an annual turnover of £200 million, making it one of the fastest-growing engineering firms in the world.