In comparison to the Big 4, this organization is clearly insignificant.
That's why I should have gone with "one of the top 25" firms.
Nonetheless, "a top firm" is still applicable here, not "the top firm".
Their own website touts their spot in the top 25, and Accounting Today's 2021 revenue ranking further confirms this by placing them at number 21. While Mazars are 26th on the same list.
(https://www.accountingtoday.com/the-2021-top-100-firms-data)
Evidently, this firm have audited billions and supposedly assured investors!
But also I am more concerned about the lost savings of innocent people!
Like Ontario Teachers', Canadian pension funds!