GlaxoSmithKline [GSK] – 41 years on the LSE

On this day in 1972 GlaxoSmithKline listed on the LSE.

The following chart plots the average monthly out-performance of the shares over the FTSE 100 Index since 1988. For example, on average GlaxoSmithKline has out-performed the FTSE 100 by 1.7 percentage points in June.

Average monthly performance of GlaxoSmithKline [GSK] relative to the FTSE 100 Index (1988-2013)

Observations:

  1. The strongest month for GlaxoSmithKline shares relative to the market has been June (the shares have out-performed the market in this month in 16 of the last 25 years).
  2. The weakest month for GlaxoSmithKline relative to the market has been October (the shares have only out-performed the market in this month in 10 of the past 25 years).

GlaxoSmithKline is in the FTSE 350 Pharmaceuticals & Biotechnology [NMX4570] sector.

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