NEW YORK (Reuters) -U.S. banking giants announced plans on Tuesday to raise their third-quarter dividends after clearing the Federal Reserve's annual health check last week.

The moves come after the lenders showed they have enough capital to withstand scenarios including a severe economic downturn, spiking unemployment and market turmoil.

JPMorgan Chase, the nation's largest bank, raised its dividend to $1.50 a share from $1.40, according to a regulatory filing. It also announced a new $50 billion share repurchase program, effective on Tuesday and with an unspecified end date. 

"The board's intended dividend increase, our second this year, represents a sustainable level of capital distribution to our shareholders and is supported by our strong financial performance," JPMorgan CEO Jamie Dimon said. 

"The new share repurchase program provides the ability to distribute capital to our shareholders over time, as we see fit," Dimon said, adding that the stress test shows that banks are resilient.

Separately, Bank of America will raise its dividend by 8% to 28 cents per share, while Wells Fargo increased it to 45 cents a share from 40 cents, they said in separate filings.

Morgan Stanley's board has approved a new $20 billion share repurchase program without specifying an end date and also plans to raise its quarterly dividend to $1 per share.

On average, the Fed's stress test found banks retained an average 11.6% ratio of their common equity Tier 1 capital, well above the 4.5% minimum required by regulators. The nation's six largest banks all retained double-digit capital ratios under the test.

The Fed is in the process of overhauling the way the test is conducted. 

The regulator proposed in April that the results should be averaged over two years, which could lead to less volatility in outcomes. 

That rule-writing project is still ongoing, but the central bank said on Friday that if the 2025 and 2024 results were averaged, banks would have needed to set aside more capital to meet the requirements.