The Interpublic Group of Companies, which owns McCann-Erickson and the world's largest PR company Weber Shandwick Worldwide, saw its price fall by 13.1% to $21.80 (£14.88).
Omnicom Group saw its price fall by 5.4%, from a close of $73.53 (£50.19) on September 10, to $67.25 (£45.90) in morning trading. Omnicom owns the BBDO Worldwide and DDB Worldwide network of advertising agencies, as well as the OMD media-buying network.
The New York-listed French advertising giant Publicis Groupe, which recorded a slight rise in profits over the first half of the year, also saw its price fall. It was only slightly off its closing price on September 10 -- down by 2.8% to $21.10 (£14.40).
Nasdaq-listed Grey Global, which owns Grey Advertising, also experienced a downturn in its stock price, falling by 6.5% to $588 (£401.32).
Commentators are in two minds over the market's reaction to the reopening of the stock exchange. While some predicted sharp falls, others say that a strong desire to keep economic spirits buoyed will rally the market -- at least in the short term.
But with a global recession affecting the ad industry, it is unlikely that media stocks will benefit from this goodwill.
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