A global partnership
Sidara is a global partnership of leading brands, operating through a five-pillar model comprising multi-disciplinary, architecture, project management, global infrastructure and energy. Today's group of companies rebranded as Sidara in 2023; some of the industry's most recognizable brands are proud members of the Sidara Group, including Dar, Perkins & Will and TYLin.
Sidara is 100% owned by the working partners within the business. Sidara’s bespoke operational structure is unique amongst its global peers and means that its businesses benefit from the group’s scale whilst retaining the individuality of brands. Sidara’s brands serve the highly complex and critical engineering needs of its roster of large blue-chip clients, ranging from global technology and energy companies to leading hospitals, airports, universities and governments.
Sidara
In numbers...
21.5k+
Employees
60+
Countries
300+
Offices

Organic growth through successful acquisitions
Since its inception in 1956, Sidara has grown organically and through the strategic acquisition of companies with exceptional talent and culture. Sidara acquired Perkins&Will in 1986 and over the past nearly four decades has supported and developed it to become a leading global architecture and design firm. During this period, Sidara has made significant other operational and financial investments in the business including numerous acquisitions.
Sidara acquired T.Y.Lin International in 1989, at the time a US-based and US-focused civil and structural engineering firm and has dedicated significant resources to help develop it into a globally recognisable name with an expanded focus across the Americas and within Asia-Pacific.
About Bidco
Bidco is a company incorporated by Sidara for the purposes of making the Acquisition. It is a wholly-owned direct subsidiary of Sidara. Save for activities undertaken in connection with its registration and the Acquisition, Bidco has not, since its incorporation on 26 March 2024, traded prior to the date of this Announcement.