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In the early trading session, the company dropped 17p to 529.5p, reports the Guardian.
Meanwhile, Citigroup slashed its price target from 800p to 550p and lowered its recommendation from buy to hold.
Analyst Fiona Maclean said it was disappointing that Amec does not provide guidance of any form for 2009.
She commented: "The company remains confident of achieving a group earnings margin of 8.5 per cent in 2010, but there is now a lack of clarity as to how this will be achieved as the cycle turns down."
Meanwhile, Barclays was the biggest FTSE riser, increasing by more than 16p to 90.5p after it emerged the bank was in talks about the possible sale of its iShare business.
In other banking news, members of two UK pension funds are suing the Royal Bank of Scotland.
