3 insights from the FTSE 100’s performance that could help you curb impulsive decisions

Despite ups and downs throughout the year, 2025 proved to be a great year for the FTSE 100 – an index of the 100 largest companies listed on the London Stock Exchange.

According to the Guardian (31 December 2025), the FTSE 100 increased in value by a fifth in 2025, marking the strongest annual gain since 2009. When markets closed on New Year’s Eve 2025, the index was up 21.5% compared to where it was at the start of 2025.

The index got off to a positive start in 2026 as well. The BBC reported (2 January 2026