Overnight ETFs: A lower-risk cash management solution

For investors seeking to combine liquidity, stability, and more predictable returns, overnight exchange traded funds may be the solution they need. 

These offer an alternative approach to traditional cash management solutions by maintaining exposure to the short-term interest rate environment.

An Overnight ETF is an investment vehicle designed to replicate the performance of an index tracking very short-term interest rates. For the example, the Solactive Euro Overnight Return Index tracks the performance of a daily compounded investment in the Euro Short-Term Rate (€STR).

The €STR acts as the official one-day interbank interest rate for the eurozone, published daily by the European Central Bank. It replaced the EONIA benchmark in January 2022 and is widely used as a yardstick for monetary policy, financial markets, and financial product pricing.

An Overnight ETF’s main goal is to offer a cash management solution via a highly liquid and stable vehicle, making it ideal for capital preservation and liquidity management.

The investment process 

These types of ETFs employ a sophisticated, synthetic replication strategy – essentially, instead of holding the underlying assets directly, it uses equity swaps to mirror an index’s performance.

Swaps are derivative contracts via which two parties exchange financial instruments’ flows. Investment banks for example often hold equities on their balance sheets but do not retain them permanently. Via these swaps, equities are temporarily transferred to the ETF, and the economic return of the basket of stocks is passed back to the banks.

In exchange, the ETF receives the daily rate – such as from the €STR – through the swaps, often with a small positive margin. The fund’s portfolio manager defines the investable universe, applying certain financial or non-financial criteria, and selects the stocks in the basket, ensuring transparency and liquidity.

Vitally, swaps are fully collateralised daily with cash, and counterparty risk is capped at 10% of the fund’s net asset value (NAV). While investors need to be mindful of counterparty risk, it worth noting that if the counterparty (bank) fails, the ETF can terminate the swap and replace it with another, thereby potentially lowering risk. The fund also has ownership of the underlying assets.

And a big advantage of a synthetic, rather than physical approach, is that transaction costs may be lower than having to buy and physically replicate instruments. And if you’ve got lower transaction costs, that should be reflected in investor returns. 

Can Overnight ETFs deliver cash plus returns? 

While these vehicles are designed to closely follow overnight rates, ETFs can potentially generate returns higher than the underlying index. Two main factors help to drive such outcomes: 

• Positive margins: Banks may pay a positive margin to the ETF as part of their balance sheet optimisation, risk-sharing strategies, and advantageous repurchase rates
• Liquidity and regulatory management: Banks’ efforts to optimise regulatory capital and liquidity management can also contribute to the margin paid to these ETF, potentially enhancing their overall returns

Key characteristics 

Overnight ETFs offer investors several potential advantages, especially for conservative investors or those merely seeking greater liquidity. At their core, they aim to provide a low-volatility investment suitable for cash, and risk management. 

Using synthetic replication, these vehicles offer a transparent, flexible, and risk-managed approach making them a potentially ideal component of a broad, diversified investment portfolio.

As markets evolve and interest rates fluctuate, Overnight ETFs could serve as a valuable component of a diversified investment strategy, potentially helping investors preserve capital while earning a return aligned with prevailing short-term rates.