The table below lists the GICS sector weightings of the FTSE 100 index. Currently (12/31/2018), the largest sector is the Financials sector that makes up 20.5% of the index. Energy companies come second with a weighting of 17.2%. The largest individual index component is HSBC Holdings whose weight is 7.7%, followed by Royal Dutch Shell Class A (6.2%). However, Shell has two share lines part of the FTSE 100 and together with Class B, Royal Dutch Shell makes up 11.3% of the index.
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[FTSE 100 Index] – GICS Sector Weightings
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