Mandates counts every offering a house was named on, in any role. Bookrun counts the subset where the cover page credited it as a book-running manager. The economics and the client relationship sit there, not with the co-managers.

Deal volume is full deal credit: the gross proceeds of every offering the house appeared on, which is how league tables are conventionally kept. Allocation is narrower and more honest: the units the underwriting agreement assigned to that house specifically. Not every prospectus discloses the table, so the column is blank rather than estimated where it does not.

Completion rate is the share of that bank’s already-resolved SPACs that closed a business combination rather than liquidating. It measures the vehicles, not the bank’s execution, since a syndicate has no control over whether a sponsor finds a target, but it is the clearest read available on whose deals tend to finish.