Weiss & Lurie, a national class action and shareholder rights law firm with offices in New York City and Los Angeles, is investigating possible breaches of fiduciary duty and other violations of law by the Board of Directors of Nalco Holding Company (NYSE: NLC) arising from its proposed acquisition by Ecolab Inc. (NYSE: ECL) in a cash and stock transaction valued at approximately $5.4 billion. Under the terms of the transaction, Nalco shareholders may elect to receive either 0.7005 share of Ecolab common stock or $38.80 in cash for each Nalco share.

Weiss & Lurie is investigating whether the Company's Board acted in the best interests of shareholders in approving the transaction and whether the Board properly sought to maximize shareholder value.

If you own Nalco shares and would like more information about your rights as a shareholder or additional information concerning our investigation, please contact Michael A. Rogovin either by email at [email protected] or by telephone at (888) 593-4771.

Weiss & Lurie has litigated hundreds of stockholder class and derivative actions for violations of corporate and fiduciary duties. We have recovered over a billion dollars for defrauded institutions and individuals and obtained important corporate governance in these cases. If you have information or would like legal advice concerning possible corporate wrongdoing (such as insider trading, waste of corporate assets, accounting fraud, or issuing materially misleading press releases or SEC filings), consumer fraud (such as false advertising, defective products, or other deceptive business practices), or anti-trust violations, please email us at [email protected] or fill out the form on our website, http://www.weisslurie.com/contact/report_fraud/.

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Weiss & Lurie
Michael A. Rogovin, Esq.
1500 Broadway, 16^th Floor
New York, NY 10036
T: 212-682-3025
F: 212-682-3010
www.weisslurie.com