This Finpip overview summarizes IG as commonly marketed to retail traders (founded 1974; HQ: London, United Kingdom). Typical platforms include IG proprietary platform, MetaTrader 4, ProRealTime.
Regulatory snapshot (not legal advice): FCA; ASIC; BaFin; MAS; FMA NZ; NFA (US); extensive global licences
Official website: https://www.ig.com/. Confirm licence numbers, product availability, and costs there before funding an account.