December 28, 2017 - The lead plaintiff filed a notice of appeal.
November 22, 2017 - The court entered a judgement in favor for the defendants' and closed the case.

September 30, 2017 - The court granted defendants' motion to dismiss with leave to amend.

June 30, 2016 - Defendants filed a motion to dismiss.

January 19, 2016 - The lead plaintiff filed an amended complaint on behalf of investors who purchased American Express Company (NYSE: AXP) common shares between September 17, 2014 and February 11, 2015. The lead plaintiff alleges that the defendants violated the Securities Exchange Act of 1934 by issuing false and misleading statements between September 17, 2014 and February 11, 2015.

November 17, 2015 - Lead plaintiff and lead counsel were appointed.

September 28, 2015 - Lead plaintiff motions were filed.

July 30, 2015 - An investor in shares of American Express Company (NYSE: AXP) filed a lawsuit in the U.S. District Court for the Southern District of New York over alleged violations of Federal Securities Laws by American Express Company in connection with certain allegedly false and misleading statements made between October 16, 2014 and February 11, 2015.

According to the complaint the plaintiff alleges on behalf of purchasers of American Express Company (NYSE: AXP) common shares between October 16, 2014 and February 11, 2015, that the defendants violated Federal Securities Laws. More specifically, the plaintiff claims that between October 16, 2014 and February 11, 2015, defendants issued allegedly false and misleading statements and/or allegedly failed to disclose material adverse information regarding American Express Company's business and prospects, including the status of its negotiations with U.S. Costco to renew its co-branding agreement, which was set to expire on March 31, 2016, and the financial impact of that agreement on AmEx's business and that as a result of these allegedly false and misleading statements and/or omissions between October 16, 2014 and February 11, 2015, American Express Company stock traded at allegedly artificially inflated prices, reaching a high of nearly $95 per share on December 29, 2014.

On February 12, 2015, American Express Company announced that it had lost the U.S. Costco co-branding relationship. American Express Company disclosed that the U.S. Costco co-branding agreement generated 8% of the Company's revenues in 2014, that one in ten U.S. AmEx cards had been issued pursuant to the U.S. Costco co-branding arrangement and that 20% of its outstanding loans had been made pursuant to that agreement. American Express Company stated that the Company's 2015 and 2016 profits would suffer and that American Express Company would not be able to make any headway on its previous efforts to increase earnings per share until 2017 at the very earliest.

American Express Company reported that its annual Total Revenue rose from over $33.78 billion in 2012 to over $35.89 billion in 2014 and that its respective Net Income increased from over $4.48 billion in 2012 to over $5.77 billion in 2014.

Shares of American Express Company (NYSE: AXP) declined from $95.84 per share in July 2014, respectively $94.29 per share in December 2014 to as low as $76.53 per share in April 2015.