Arnotts | 16,585 followers on LinkedIn. Arnotts is part of Brown Thomas Arnotts. Visit https://www.linkedin.com/company/brown-thomas-arnotts for the latest news | Arnotts is part of the Brown Thomas Arnotts group. For the latest news, updates, and career opportunities, visit https://www.linkedin.com/company/brown-thomas-arnotts. Arnotts is Ireland’s oldest and largest department store.