BA004 · Correspondent Banking

Circular Funds Flow

A circular funds flow is a round-tripping loop: funds leave an originating account, pass through one or more intermediary accounts, and return to the same origin (or an account under the same control) having taken on the appearance of unrelated third-party activity along the way. It is BA003 Mule Accounts run backwards — where a mule forwards funds onward and never sees them again, a circular flow is engineered so the ORIGINATOR gets the funds back, laundered through the round trip itself.

The finding lives in four places: how much of what left the origin actually comes back to it, how many hops the loop takes to disguise the trip, how little value is lost along the way (ordinary correspondent banking bleeds fees and FX spread at every hop; a loop that returns almost lossless is not behaving like trade finance), and how quickly the whole round trip completes.

Risk indicators

Loop Closure

• Funds returning to the origin account within the same reporting cycle they left it
• Balance movements that net to near-zero over the round trip despite large gross flows

Hop Count

• Multiple intermediary accounts carrying the funds between origin and return
• Intermediaries with no independent commercial rationale for holding the funds

Value Preservation

• Amounts moving hop to hop with negligible fee or FX erosion
• Round-number consistency across legs inconsistent with genuine trade settlement

Timing Compression

• The full round trip completing in hours or a few days
• Legs scheduled back-to-back rather than at a pace consistent with real commercial timing

Investigation actions

1. Resolve the originating account and every loop member (first hop, second hop, closure).
2. Compute the loop closure ratio (returned amount / originated amount).
3. Count the intermediary accounts (hops) the loop passes through before closing.
4. Compute the average hop retention percentage (value preserved hop to hop).
5. Compute the loop duration in hours from origination to return.
6. Score each of the four components against its band cut-lines.
7. Aggregate the weighted exposure score; escalate at or above the threshold.

Detection logic

1. Resolve the originating account and every loop member (first hop, second hop, closure). 2. Compute the loop closure ratio (returned amount / originated amount). 3. Count the intermediary accounts (hops) the loop passes through before closing. 4. Compute the average hop retention percentage (value preserved hop to hop). 5. Compute the loop duration in hours from origination to return. 6. Score each of the four components against its band cut-lines. 7. Aggregate the weighted exposure score; escalate at or above the threshold.

Related typologies

Curated from fc-06-correspondent-banking-analytics-toolkit/typologies/BA004_Circular_Funds_Flow.md