By Andrew Morse 

ZURICH--Switzerland's central bank said Thursday the country's big banks had made "significant progress" improving their capital positions over the past year, but urged the lenders to continue shoring up their leverage ratios.

In its annual stability report, the Swiss National Bank said the country's big banks, including UBS AG and Credit Suisse Group AG, should continue improving their capital positions, in particular their leverage ratios. A leverage ratio is a key measure of stability that broadly reflects the amount of capital a bank has on hand relative to its loans and investments.

"The SNB welcomes the significant progress made by the big banks in improving their capital situation," the Zurich-based central bank said. Still, the bank "recommends that they continue to improve their resilience and, in particular, their leverage ratios."

The comments mark a softening in the Swiss central bank tone toward the big banks. In the past, the SNB has criticized the leverage ratios at both UBS and Credit Suisse,

UBS and Credit Suisse have taken steps to boost their respective leverage ratios and have said they are on track to reach the Swiss requirement for a ratio of 4% or more by 2019. UBS has reported its leverage ratio stood at 3.8% as of the end of the first quarter of this year, while Credit Suisse said its leverage ratio was 3.7%.

The central bank said leverage ratios are becoming more important because investors focus on the measure during times of stress. Next year, international rules will require globally active banks to disclose their leverage ratios, making direct comparisons possible.

Last month, Credit Suisse suffered a setback to its other primary measure of stability, its tier 1 capital ratio, following a $2.8 billion settlement with U.S. authorities for aiding American tax evasion. The bank said the settlement would have cut its capital ratio to 9.3% from the previously reported level of 10%.

Credit Suisse said it will shed assets and sell some real estate to help restore its capital ratio to 10% by the end of this year.

Still, the SNB said the big banks had made progress on their tier 1 capital ratios and noted both big banks already comply with the international requirement of 8.5% that applies beginning 2019.

John Letzing

contributed to this article.

Write to Andrew Morse at andrew.morse@wsj.com

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