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23 April 2018

イングランド銀行、SONIA(英ポンド翌日物金利加重平均)算出を開始


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The Bank has today implemented its reforms to the SONIA interest rate benchmark. The Bank’s aim in reforming SONIA is to strengthen a benchmark which is considered critical for the sterling financial markets. Previously, the benchmark was based on a market for brokered deposits which has limited transaction volumes.


It now captures a broader scope of overnight unsecured deposits, by including bilaterally negotiated transactions alongside brokered transactions. Volumes underlying the rate based on the new methodology now average around £50 billion daily, over three times larger than those underlying SONIA previously.

In addition to the methodological changes, the publication time of SONIA has been moved, such that the SONIA rate for a given London business day is now published at 09:00 on the following London business day. As previously announced, the SONIA rate for Monday 23 April, will be calculated by the Bank using the reformed methodology and published at 09:00 Tuesday 24 April.

Commenting, Dave Ramsden (Deputy Governor for Markets and Banking) said “Today’s implementation of the reforms to SONIA is an important milestone in the Bank’s delivery of improvements to the resilience and effectiveness of financial markets. The reforms improve the sustainability and representativeness of this key piece of the sterling market infrastructure.”

The Bank will publish an assessment of its compliance with IOSCO’s Principles for Financial Benchmarks in the summer. An assurance report produced by EY will be published alongside this.

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