The Financial Stability Board spelled out for the first time Thursday the amount of extra capital it would expect the world's largest banks to hold in respect of the potential risk they pose to the global financial system by their size and scale.

The FSB, which coordinates the global regulatory response to the financial crisis on behalf of the Group of 20 leading advanced and emerging economies, identified Citigroup Inc. (C), HSBC Holdings PLC (HBC, 0005.HK), Deutsche Bank AG (DBK.XE, DB) and J.P. Morgan Chase & Co. (JPM) as the four banks most central to the system, on the basis of their 2011 data.

It said the banks should be subject to a capital surcharge of 2.5 percentage points over and above the statutory minimums laid out in the so-called Basel III accords on bank capital. It said 24 other banks on its list should be subjected to smaller surcharges of between 1% and 2%. Basel III requires banks to hold capital equivalent to at least 7% of their risk-weighted assets to operate freely.

The FSB's estimate isn't binding, yet. It will only draw up a definitive list of "global systemically important financial institutions," or G-SIFIs, in 2014, and the capital charges will be phased in between 2016 and the start of 2019, in parallel with Basel III.

Regulators have attached particular importance to such "systemically important financial institutions," or SIFIs, their phrase for the banks that are labeled as "Too Big To Fail." The extra capital requirements are aimed at reducing the risk of one of them failing and causing massive worldwide disruption in the manner of investment bank Lehman Brothers Inc in 2008.

In updating its list, the FSB made only two changes to the original list it drew up last year, dropping Germany's Commerzbank AG (CBK.XE) and Franco-Belgian lender Dexia SA (DEXB.BT). Dexia had collapsed at the end of 2011, requiring the kind of multi-billion taxpayer-funded rescue that the new surcharges are aimed at avoiding.

The updated list was part of three separate progress reports that the FSB prepared for a meeting of G-20 finance ministers and central bank governors in Mexico City this weekend.

In its reports, the FSB sharply criticized the SIFIs for the lack of progress made in reducing the risks they pose to the world. Last year, it had instructed its initial list of G-SIFIs to draw up by the end of 2012 Recovery and Resolution Plans, also known as RRPs or "living wills", that would enable supervisors to wind them down in an orderly fashion if they fail.

By its own carefully-worded standards, it was scathing of the banks' first drafts, accusing them of being blase about the losses they could incur, and about the legal difficulties of resolving a cross-border failure.

The FSB said its reviews, which are still in progress, "have highlighted a need for greater severity in the hypothetical stress scenarios and for a more exhaustive analysis with regard to impediments to the implementation of recovery measures, taking into account interconnections between group entities and constraints arising from the legal framework."

It said key supervisory committees will launch a review in 2013 of each SIFI resolution plan to check that it can be practically put into operation. The FSB's reports appeared to draw heavily on recent financial incidents such as the disastrous "London Whale" hedging operation that cost J.P. Morgan over $6 billion, and the collapse of investment firm MF Global, which was followed by a storm of allegations that client funds had been misappropriated as management vainly tried to stave off disaster.

The FSB said that the MF Global case "and other external events" had underlined the need for "clear, transparent and enforceable arrangements" to protect client assets, and it voiced concern at how far authorities are from being able to guarantee this today.

"Greater understanding is needed of how those objectives can be achieved in the case of financial firms with significant holdings of client assets, and particularly where those assets are held in different jurisdictions," the report said.

In general, the FSB's urged overseers to be more pro-active and intrusive in their supervision of G-SIFIs, telling them to pay more attention to banks' succession planning and to the performance expectations that they set for key management figures.

It also said supervisors should be in more frequent and intensive contact with SIFIs' boards and more "dynamic" in assessing the general risk culture within institutions.

Write to Geoffrey T. Smith at geoffrey.smith@dowjones.com

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