By Jeannette Neumann and Christopher Bjork 

MADRID-- Banco Santander SA said it would raise up to EUR7.5 billion ($8.88 billion) in capital, a bid to address long-running concerns among investors and analysts that its financial cushion was weaker than those of its peers.

Santander, the largest bank in the eurozone by market value, said in a regulatory filing on Thursday that it would raise the capital through a so-called accelerated book-building process, which entails selling the stock overnight to institutional investors.

The Spanish bank is also slashing its dividend in 2015 to EUR0.2 a share down from the EUR0.6 a share it has paid since 2007. Santander said it would divide the annual payment to shareholders into three cash dividends and one scrip dividend.

Spain's stock-market regulator suspended trading in the bank's shares ahead of the announcement.

The shares of major Spanish banks traded lower following the announcement.

Santander said in its most recent quarterly earnings presentation that its capital ratio under the latest regulatory requirements, known as "fully-loaded" Basel III criteria, would be around 8.5% to 8.6% of risk-weighted assets, below its European peers and a source of concern for some analysts and investors.

The move is the latest by Ana BotíSHYn, who took over as the bank's executive chairman in September after the death of her father, longtime chairman Emilio BotíSHYn.

Ms. BotíSHYn replaced Chief Executive Javier Marín in November, appointing in his place José Antonio A lvarez, who had previously served as chief financial officer.

Write to Jeannette Neumann at jeannette.neumann@wsj.com

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