Pros
Arup is the creative force at the heart of many of the world’s most prominent projects both large and small scale in the built environment and across industry. With 90 offices in 35 countries our 10,000 staff offer a broad range of professional services and through its work they make a positive difference in the world. Arup’s independence, enabled by its employee ownership structure, fosters a distinctive culture and an intellectual independence that encourages collaborative working. This is reflected in everything Arup does, allowing development of meaningful ideas, helping shape agendas and delivering results that frequently surpass the expectations of clients. It also gives individuals the freedom to develop in a supportive and stimulating environment.
Cons
I haven't found many, but sometimes the competitive group structure can create boundaries between teams that need not exist.