STOCK WATCH

FILTRATION companies don’t sound like the most dynamic place to make a return, but Porvair is on the rise.

The company, which makes filters to be used in anything from aeroplanes to food factories, said revenue growth for the year ended November would be around 10pc.

The aerospace and industrials division was particularly strong, and earnings for the whole group would be ahead of expectations, Porvair said.

Shares ended the day 3.4pc higher, or 14p, at 424p.