interactive investor Limited is a subscription-based online investment service in the United Kingdom, founded in 1995 by the entrepreneur Sherry Coutu.

In 1995, Coutu hired Tomas Carruthers from ESI to bring trading capability and equities to supplement the company's fund-management information.

The company has grown to be the UK's second-largest retail investment platform, with more than 300,000 customers and more than 7.4 million unique users per annum.

[4] The company was unprofitable in that year,[5] and by July 2001 its share price had fallen below 25 pence after reaching 415p in March 2000, during the dot-com bubble.

[8] Until its purchase in 2022 by Abrdn, interactive investor was a private limited company incorporated in 2003 and majority owned by funds advised by J.C.

In October 2018, ii announced a deal to buy Alliance Trust Savings, which was completed in July 2019 and brought together the two largest flat-fee online investment platforms.

[17] Abrdn plc, a British-based financial company formed by the 2017 merger of Standard Life with Aberdeen Asset Management, agreed in December 2021 to acquire ii for £1.49 billion; the sale was completed in May 2022.