By Emily Glazer 

J.P. Morgan Chase & Co.'s chief financial officer on Wednesday said it is "reasonable" to assume the largest U.S. bank's capital ratio could go up to a total of 11.5%, just a day after U.S. regulators said eight of the largest U.S. banks will need more capital to make the financial system less risky.

Marianne Lake, speaking at a finance conference in New York, said the new rule would put J.P. Morgan at an expected high end of the additional capital buffer of 4.5% of risk-weighted assets, on top of the base 7% common-equity capital requirements most banks face.

The increased capital ratios reflect broader efforts by the Federal Reserve and other regulators to have banks hold more cushion against bad economic times or soured loans. The bigger and more complex a bank, the more capital it has to hold, since a big bank's demise would create the most serious problems for the economy.

On Tuesday, Federal Reserve officials said J.P. Morgan, the nation's largest bank by assets, will feel the biggest impact of the new rules, since the bank is $21 billion short of the capital requirement.

Fed Vice Chairman Stanley Fischer, in an apparent misstep, disclosed during an open meeting Tuesday that J.P. Morgan is the only one of the eight banks involved that face a shortfall under the proposed rule. Fed staff had closely guarded details of the proposal's impact on specific firms.

Ms. Lake on Wednesday said the announcement didn't entirely come as a surprise to the bank.

She said J.P. Morgan over time would probably get its capital ratios to about 12%, or 0.50 percentage points higher than the expected requirement. Today, J.P. Morgan's minimum capital ratio is 9.5%. Ms. Lake has said in the past that the bank is running between 10% and 10.5%.

In response to a question on whether the bank would try to reduce its required capital surcharge, Ms. Lake expressed skepticism, saying it wouldn't happen if it caused "more-than-surgical changes" to J.P. Morgan's strategy.

"It's important for us to maximize the terms on the capital we have...in the most efficient way," Ms. Lake said.

She said the capital-ratio gap with the bank's largest, most meaningful competitors is around 1 percentage point, but that the bank can still compete effectively.

But certain parts of the bank, particularly its commercial and consumer divisions, could have wider capital-ratio gaps than local competitors. J.P. Morgan will counter that by emphasizing its broader services, larger international scale and additional platforms.

The bank is talking with clients about the pricing of loans, Ms. Lake said. But she added: "We don't want to overcorrect or overreact today." The proposed rules, if completed, would be phased in starting in 2016 and take full effect in 2019.

Ms. Lake said the bank will disclose more details Feb. 24 at its own investor conference.

Ms. Lake also spoke about the mortgage market, with the expectation that it will be "slightly slow" in 2015.

She said the bank is working on repositioning its mortgage business, making it smaller and working with high-quality borrowers. Though it is possible the bank may expand its credit standards to mortgage lenders, that will only happen if a loan falls in a specific "high-quality" segments the bank is targeting, Ms. Lake said.

Write to Emily Glazer at emily.glazer@wsj.com

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