Any ideas why price has decreased so dramatically recently?

Nov 2017
StockMarketWire.com
The scheme of arrangement for the recommended cash acquisition of Imagination Technologies by CBFI Investment, a wholly-owned subsidiary of funds managed by Canyon Bridge Capital Partners, has taken effect.
Scheme Shareholders on the register of members of Imagination at the Scheme Record Time, being 6.00 p.m. on 3 November 2017, will be entitled to receive 182 pence in cash for each Scheme Share held.