US hedge fund Elliott was agitating for change last year, arguing that Micro Focus should sell itself or offload its Suse Linux arm. Elliott later sold the stake.
Micro Focus went on to sell Suse to EQT for $2.5 billion.
Chief executive Stephen Murdoch said: “We have determined that it is appropriate to accelerate the undertaking of a strategic review of the Group’s operations with a view to determining where performance can be improved and how the business can be better positioned to optimise shareholder value.”
The latest warning could prompt controversy because executive chairman Kevin Loosemore sold half of his stake in the company for £11.6 million just seven weeks ago.
Shares fell to a low of 1067p after closing last night at 1555p. The market cap fell from £5.2 billion to £3.6 billion.