Triparty Custody Cash Sweep Concentration Risk
The Formal Definition
The systemic credit and counterparty exposure that occurs when an investment platform sweeps all customer uninvested cash into a single clearing bank or single commercial money market provider, eliminating institutional custodial diversification.
Concentration Exposure = max_{Single Bank i} [ Deposited Sweep Volume_i / Total Customer Sweep Reserves ] (High Risk > 50%)
Cole Barrett's Reality Check
The Unvarnished Bottom Line"Diversification isn't just for your stock picks; it's for your cash. If your broker advertises $2.5 million in FDIC insurance, look at how they do it. A safe broker distributes your cash across ten different banks in $250,000 slices. A lazy broker dumps your entire balance at a single partner bank. If that single bank goes under, your cash above $250,000 is an unsecured creditor claim."
Interactive Simulator: Test the Math
Real-World Example: Scenario Breakdown
Examining the real numbers for: An investor holding $800,000 in uninvested cash across a retail broker cash sweep program during a regional banking panic
| Execution Metric | Multi-Bank Insured Sweep Client | Single-Bank Sweep Depositor |
|---|---|---|
| Fee / Rate | $0 account fees | $0 advertised fees |
| Spread / Buffer | Broker utilizes an automated multi-bank sweep program distributing cash across 4 independent FDIC-insured banks ($200k each) | Broker swept the entire $800,000 balance into a single regional commercial bank partner |
| Execution / Status | 100% of the $800,000 balance was fully covered by statutory sovereign deposit insurance guarantees | Partner bank entered regulatory receivership; FDIC covered only the statutory $250,000 ceiling |
| Total Cost / Result | Total capital preservation via multi-bank sweep diversification | Suffered substantial uninsured capital exposure from sweep concentration |
How Brokers Weaponize This Term
Open your brokerage account settings and download the 'Cash Sweep Participating Bank List'. If your broker sweeps cash to fewer than 5 partner banks or holds more than $250,000 at any single institution, opt out and move excess cash into a direct Treasury bill fund like SGOV.
Broker Evaluation Matrix
Cole Approves
Wealthsimple: Provides institutional cash sweep protection by distributing client funds across up to five partner banks to provide up to $500,000 in CDIC deposit insurance.
Read Audit →Cole Flags / Avoids
Single-Partner Fintech Apps: Holds customer deposits at single regional partner banks without multi-bank sweep programs, leaving balances exposed to deposit flight shocks.
View Trap Details →Frequently Asked Questions
How does a multi-bank sweep program provide multi-million-dollar FDIC coverage?
By using automated intra-bank networks (like IntraFi / Promontory) that break your deposit into chunks under $250,000 and distribute them across dozens of separate chartered banks.
Can I choose which banks hold my cash in a sweep program?
Yes. Most compliant brokerages allow you to 'opt out' of specific banks on their sweep list if you already hold deposits with them directly, avoiding overlapping insurance limits.