US firms account for 74, or 67%, of the total 111 corporate defaults so far in 2016, according to research by S&P Global Ratings.
The 111 defaults this year means the level of defaults is already approaching the total figure of 113 last year.
S&P also said the global energy and natural resources sector has seen a default rate seven times higher than other sectors. Of the global firms that are in default, 53% are from the energy sector.
Some investors had hoped the commodity price rebound earlier this year would save those smaller, highly leveraged energy firms.
Diane Vazza, researcher at S&P, said that the default tally is now 40% higher than it was at this point last year. She repeated a point made in April that default rates were previously this high in 2009 following the financial crisis.
There appeared to be a renewed appetite for US high yield earlier this year although many investors were stripping out energy companies.
The latest research from S&P showed that there were two additional defaults in August alone, financial institution CNG Holdings and the other was energy company LTR Holdco.
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