The world's largest investment banks have had their worst start to a year since 2006, according to the latest data published by industry analyst Coalition on Thursday.

In the first six months of 2019 investment banks reported revenues of 76.8 billion U.S. dollars, down 11 percent on the prior year and the lowest first-half performance for 13 years.

Revenues fell across the board, with the deepest decline in equities trading, down 17 percent to 22.1 billion U.S. dollars.

Fixed income, currencies and commodities revenues fell nine percent, while investment bank advisory was down eight percent.

The banks' profitability also suffered, with operating margins sliding 500 basis points to 31 percent, their lowest level for four years.

Several major banks have cut jobs in their investment banking divisions in response to weak results, including Deutsche Bank, HSBC, Societe Generale and Citigroup.

Deutsche Bank plans to make the deepest cuts after announcing 18,000 jobs cuts in July, with the bulk in investment banking.

Coalition tracks Bank of America Merrill Lynch, Barclays, BNP Paribas, Citi, Credit Suisse, Deutsche Bank, Goldman Sachs, HSBC, JP Morgan, Morgan Stanley, Societe Generale and UBS.