By Andrew Morse 
 

ZURICH--Switzerland's central bank said Thursday the country's big banks had continued to make improvements in their capital positions, but urged the lenders to not to lose momentum in their progress.

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 leverage ratios, key measures of stability that broadly reflect the capital banks have relative to their loans and investments.

"Over the past year, the Swiss big banks have continued to improve their capital situation, albeit at a slower pace than the year before," the Zurich-based central bank said. The SNB said the big banks already meet many Swiss and international requirements that come into effect in 2019.

UBS and Credit Suisse have taken steps to boost their respective leverage ratios. Earlier this year, UBS reported its leverage ratio stood at 4.3% as of the end of the first quarter of this year, while Credit Suisse said its leverage ratio was 4.2%.

Leverage and other capital ratios are becoming more important because investors focus on the measures during times of stress.

In April, Credit Suisse said another measure of stability, its tier 1 capital ratio, fell slightly to 10% after a sharp rise in the Swiss franc eroded the reported value of capital denominated in other currencies.

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

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