Trading-incident internal audit review for a tier 1 US bank

A tier 1 US bank commissioned a special internal audit review of a material trading incident. The mandate was the design and operating effectiveness of the controls around the event, and the root-cause analysis the board and regulators would expect. The review was co-sourced with a Big Four firm and needed specialist audit management that could work inside that programme from day one.

GRT supplied an audit manager into the co-sourced team. Our specialist worked to the bank’s internal audit mandate, inside the Big Four programme, on control design, operating effectiveness and root cause.

GRT delivered audit management inside a larger review team, not a boutique running a side review. We field senior specialists who join programmes at this scale, and we field our own teams when the client wants GRT to run the workstream.

Trade lifecycle under incident conditions: concealed activity on the left; forensic internal audit reconstructing the path, controls and root cause on the right.

CONCEALED PATH — activity kept off the control spine
Order → execute → book → confirm → settle → report Client / desk order Execution Malicious / rogue path Off-book · delayed booking Suppressed cancels · shadow PnL Visible flow Looks routine Hidden bookings Confirm / settle Reporting / MI gap Surveillance ? Limit / P&L controls ? Escalation ? Dashed path = activity kept outside the control narrative
FORENSIC REVIEW — reconstruct · test controls · root cause
Internal audit + co-sourced programme Special IA mandate Design & operating effectiveness · root cause Forensic audit team GRT audit manager · Big Four co-source Evidence pack Trades · cancels · chats · stamps Rebuilt lifecycle timeline Order Execute Book Confirm Settle Report Control design & operating effectiveness tests Where concealment should have been stopped · what actually fired Root-cause analysis for board & regulators Timeline rebuilt Controls tested Root cause clear Audit management inside the co-sourced programme — not a side review

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