Money Market Funds: How Safe Are They?

Key Concepts

• Money Market Funds (MMFs): Investment funds designed to provide liquidity and preserve capital by investing in short-term debt instruments.
• Physical vs. Synthetic Structure: The two primary ways MMFs are built—holding actual debt instruments (Physical) or using total return swaps (Synthetic).
• LVNAV (Low Volatility Net Asset Value): A regulatory classification allowing funds to maintain a stable £1 price, provided mark-to-market deviations stay within a 20-basis-point (0.2%) collar.
• Sonia (Sterling Overnight Index Average): The benchmark interest rate for the UK, which synthetic MMFs aim to track.
• Gating: A mechanism where a fund restricts or suspends investor redemptions during periods of extreme market stress.
• UCITS: The European regulatory framework governing these funds, ensuring assets are legally ring-fenced from the fund manager.

1. Regulatory Protection and Misconceptions

A common misconception among UK investors is that the Financial Services Compensation Scheme (FSCS) protects MMF units up to £120,000.

• The Reality: The £120,000 limit applies to cash held in UK-authorized banks.
• Investment Platforms: If cash is held on a platform, it is protected under "Client Money" rules (CASS), but if you have converted that cash into MMF units, the FSCS investment protection limit is £85,000, which only triggers if the platform becomes insolvent, not if the fund loses value.
• Fund Protection: Protection is provided by UCITS law, which mandates that fund assets be held by an independent depository, legally separating them from the manager’s balance sheet.

2. Structural Differences: Physical vs. Synthetic

• Physical MMFs: Hold actual financial instruments (government bills, commercial paper, repo agreements).
  • Risk Profile: Direct credit risk based on the issuers of the debt held.
  • Liquidity: Must maintain mandatory buffers (10% overnight, 30% weekly maturity).
• Synthetic MMFs (e.g., CSH2): Use a Total Return Swap (TRS) with global systemically important banks (G-SIBs).
  • Mechanism: The fund holds a basket of equities (e.g., Nvidia, Amazon) as collateral. The swap counterparty pays the fund the Sonia rate daily.
  • Risk Profile: Counterparty risk (the banks). UCITS rules require over-collateralization (at least 100%) to protect against counterparty default.

3. Performance and Stress Testing

• March 2026 Stress Test: During a period of widening corporate credit spreads, physical funds faced pressure on their LVNAV collars. Synthetic funds, however, remained insulated because their NAV is tied to the Sonia rate via swaps, not the market value of the collateral basket.
• Interest Rate Sensitivity: MMFs have almost zero duration. When interest rates fall, the rate of return decreases, but the NAV does not suffer a capital loss. Any minor dips in NAV are typically due to bid-ask spreads or accrual timing, not credit stress.

4. The Risk of "Access Risk"

The speaker emphasizes that while default risk is low, access risk is a significant concern.

• Case Study (March 2020): Despite no defaults, £25 billion was pulled from Sterling MMFs in eight days. LVNAV funds neared their 20-basis-point collar.
• Intervention: The Bank of England’s COVID Corporate Financing Facility (CCFF) prevented "gating" by purchasing commercial paper directly, restoring market liquidity.

5. Actionable Checklist for Investors

Before selecting an MMF, investors should evaluate:

1. Classification: Is it a Government fund (more insulated) or an LVNAV fund?
2. Transparency: Who are the top five issuers/counterparties?
3. Provisions: Does the prospectus include "gating" clauses?
4. Diversification: Do you hold a secondary liquidity reserve outside the fund to avoid being trapped during a redemption freeze?

Synthesis

Money market funds are effective tools for capital preservation, but they are not "cash" in the traditional bank-deposit sense. Physical funds offer transparency but are vulnerable to corporate credit spread widening. Synthetic funds offer insulation from credit spreads but rely on the solvency of G-SIB counterparties. Investors should prioritize understanding the specific structure of their chosen fund and maintain a secondary liquidity buffer to mitigate the risk of temporary redemption gating during systemic crises.