Ask most corporate services providers where client cash sits, and the honest answer is usually: wherever the account was first opened. A relationship that began years ago, for reasons that may no longer apply, quietly becomes the entire cash strategy. That is not a decision. It is an accident that hasn’t been revisited.
The single-counterparty problem
Holding client cash with one bank concentrates risk in a way that would be unthinkable anywhere else in a portfolio. No investment committee would place 100% of a fund’s assets with a single manager. Yet single-bank cash holding is still the default for many trust structures and corporate vehicles, not through poor judgement, but through inertia.
The risks are not theoretical. Bank-specific stress events, however rare, have shown that deposit protection schemes have limits, that liquidity can tighten without warning, and that “systemically important” is not the same as “risk-free”. For a trustee or administrator holding client money, the question a beneficiary or regulator may eventually ask is simple: why was everything with one institution?
What a panel approach actually does
Diversifying across a panel of vetted counterparty banks addresses three things at once:
- Concentration risk: no single institution holds a disproportionate share of client cash
- Rate competition: banks compete for placements, rather than one bank setting the terms by default
- Operational resilience: access to liquidity isn’t dependent on a single institution’s systems or appetite on any given day
This isn’t about spreading cash thinly for its own sake. A well-run panel model still allows for concentration where it’s justified, such as larger balances with stronger-rated counterparties and smaller allocations elsewhere, but it makes that a deliberate, documented choice rather than a historical accident.
Why this is a fiduciary problem, not just a treasury problem
Corporate services providers and trustees in international finance centres sit in an unusual position: they are often the ones actually opening and managing the accounts, on behalf of clients who may never ask how those decisions were made until something goes wrong, or until a due diligence review asks for evidence of process.
Building a diversified panel manually is administratively heavy: onboarding, KYC/AML per institution, rate monitoring, instruction processing, reconciliations. It’s precisely the kind of operational burden that pushes providers back towards the path of least resistance. Namely one bank, one relationship, one point of failure.
Where aggregation platforms fit
This is the gap deposit aggregation exists to close: a single point of access to a panel of vetted banks, with onboarding, rate comparison, and instruction processing handled centrally, so diversification stops being a project and becomes the default operating model.
One bank was never a strategy. It was a starting point. The providers who move past it deliberately, and with a documented rationale, are the ones best placed to answer the difficult questions before they’re asked.