The FTSE 100 index looks like it's going to end 2026 in positive territory. One is L&G Cyber Security ETF (LSE:ISPY). Let's take a closer look at this thematic ETF to see why it's crushing the FTSE 100. The theme of the L&G Cyber Security ETF is on the tin. But this is the beauty about thematic ETFs — you don't have to pick the individual winners.