Here's how much the top Wall Street banks have earned in fees this year

JPMorgan is leading the pack when it comes to Wall Street dealmaking revenues, according to Dealogic's preliminary league tables for the first nine months of the year.

Altogether, global investment banking revenue was down 14% from the same period last year. That is improvement on the first half, where revenues came in 16% lower than the previous years.

League tables are a contentious subject on Wall Street.

Banks use them when pitching for new business, and a good ranking means serious bragging rights. But the league table-data can also be sliced up to make a bank's performance look better (by narrowing the field very narrowly, for example).

Though they're based on estimates, these tables are the broadest possible and a closely-watched indicator of who is up and who is down.

Here's how the banks stacked up this time around.