In a statement to the London Stock Exchange this morning, the company said: "Aegis announces that in recent days its representatives and advisers have met with more than one potential offeror to share non-public information on the company."
It added that there was no certainty it would receive an offer from any bidder.
It is known that Aegis chief executive Robert Lerwill has met with Maurice Levy, his counterpart at Publicis Groupe, to talk about a takeover.
But in the meantime, French corporate raider Vincent Bollore, who is chairman of rival ad group Havas, has been upping his holdings in Aegis. He now owns 11.38% of its stock, making him the biggest single shareholder.
Although he has consistently said he sees the investment as a short-term one, his actions have provoked speculation over just what his motives are.
A bidding war for Aegis had been expected to send its share price skyrocketing, but the other big players such as WPP Group and Omnicom have not shown any public interest in acquiring the company.
Aegis owns the media planning networks Carat and Vizeum, along with Isobar, the digital network.
This morning Aegis's share price was unchanged at 140p
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