On this day in 1984 Grainger listed on the LSE.

The following chart plots the average monthly out-performance of the shares over the FTSE 100 Index since 1994. For example, on average Grainger has out-performed the FTSE 100 by 1.8 percentage points in March.

Observations:

1. The strongest month for Grainger relative to the market has been December (the shares have out-performed the market in December in 12 of the last 19 years).
2. Grainger shares have been weak relative to the market in October; the shares have only out-performed the market in October in 6 of the past 19 years.