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Risks in Securities Backed Lending: Market Volatility, Margin Calls, and How to Protect Yourself

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Wesley Ranger • 25 August 2025

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Understanding the downside of securities backed lending and how wealthy borrowers can manage exposure

Securities Backed Lending (SBL) is a powerful tool. It allows wealthy clients to release liquidity against investment portfolios while continuing to benefit from growth and dividends. Used strategically, it can unlock the flexibility to purchase prime property, cover deposits, or fund business ventures without triggering taxable disposals.


But like all financial tools, SBL carries risks. With global markets shaped by inflation, currency volatility, and geopolitical uncertainty, understanding those risks has never been more important. Market downturns can impact portfolio values, trigger lender action, and — if not managed carefully — lead to liquidity pressures that undermine the very strategy the facility was designed to support.


This blog explores the risks of securities backed lending in detail, from market volatility and margin calls to eligibility challenges and repayment pressures. More importantly, it outlines practical strategies that clients and advisers can use to mitigate those risks while still benefiting from the advantages of SBL.


The Nature of Risk in Securities Backed Lending


The appeal of SBL lies in its simplicity: pledge a portfolio, release liquidity, and continue to benefit from long-term investment exposure. However, that very simplicity hides a structural vulnerability: the facility is only as secure as the portfolio it is backed against.


If markets remain stable or grow, the facility is low-risk and cost-effective. But if asset values decline, lenders can demand corrective action. This may involve posting additional collateral, making partial repayments, or in extreme cases, facing forced liquidation of securities. Unlike mortgages secured on property — where values fluctuate more slowly — investment portfolios can move sharply, creating sudden risks.


Market Volatility: The Central Challenge


The first and most obvious risk is market volatility. Securities are not fixed assets; their values change daily, sometimes significantly.

Consider an investor who pledges a £10 million portfolio against which they borrow £6 million at 60% loan-to-value. If equity markets fall by 20%, the portfolio value drops to £8 million. The loan, however, remains at £6 million. The effective loan-to-value is now 75%, breaching the lender’s agreed threshold.


At this point, the lender is entitled to issue a margin call, requiring the client to top up collateral or reduce the loan. If the borrower cannot respond quickly, the lender may liquidate assets to restore balance — often at depressed values.


This risk is particularly relevant in 2025, when global markets are still adjusting to shifting interest rate policies and currency realignments. Borrowers must recognise that while SBL preserves long-term investment exposure, it also exposes them to short-term fluctuations.


Margin Calls: How They Work


A margin call is the mechanism lenders use to protect themselves against portfolio decline. When asset values fall below agreed thresholds, the lender demands corrective action.


In practice, this means the borrower must either:


  • Deposit more securities into the pledged portfolio, or
  • Make partial cash repayments to reduce the loan.


If neither is possible, the lender may liquidate part of the portfolio. While this restores the loan-to-value ratio, it is rarely in the client’s best interest. Forced sales can crystallise losses and trigger tax liabilities.


Margin calls are the most significant risk in SBL, particularly for clients who use the facility aggressively. A prudent borrower ensures they have additional liquidity buffers elsewhere, ready to deploy in the event of a call.


Safe vs Aggressive Starting LTVs in Securities-Backed Lending

The initial loan-to-value ratio has a major impact on margin-call risk. A lower starting LTV gives the portfolio more room to absorb market falls, while a higher starting LTV can leave the borrower exposed if asset values decline.

Starting LTV Risk Profile Market Fall Buffer Typical Borrower Position Margin-Call Sensitivity
20%–30% Conservative Strong buffer against normal market movements. Often suitable for clients prioritising capital preservation and low leverage. Low, assuming the portfolio remains diversified and liquid.
30%–40% Measured Good buffer, especially where assets are diversified across equities, bonds, funds and cash. Common for HNW clients using SBL for property, tax planning or short-term liquidity. Moderate to low, depending on volatility and lender thresholds.
40%–50% Balanced but Active Reasonable buffer, but more exposed during sharp market corrections. May suit borrowers with strong liquidity, clear repayment routes and diversified portfolios. Moderate. Ongoing monitoring becomes more important.
50%–60% Higher Risk Limited buffer if markets fall or portfolio volatility increases. Generally more appropriate only where assets are highly liquid and repayment options are clear. High. Margin-call risk can increase quickly in volatile markets.
60%+ Aggressive Very limited buffer unless the collateral is exceptionally liquid and low volatility. May be unsuitable for many borrowers using SBL for property or long-term liquidity planning. Very high. A relatively modest market fall could trigger lender action.

Practical point: the maximum LTV offered by a lender is not always the right LTV to use. Many borrowers choose a lower initial drawdown to create a wider market buffer and reduce the likelihood of a margin call.

How To Reduce Margin-Call Risk Before Applying

Margin-call risk should be considered before a securities-backed lending facility is arranged, not only after markets move. The strongest applications are usually structured with conservative borrowing levels, eligible collateral, clear repayment routes and sufficient liquidity outside the pledged portfolio.

Start Below the Maximum LTV

Just because a lender may offer a higher loan-to-value ratio does not mean it is prudent to use the full amount. A lower initial drawdown creates a wider buffer if portfolio values fall.

Review Portfolio Concentration

Portfolios concentrated in one stock, sector, fund or currency are more vulnerable to sharp valuation changes. Diversification can improve lender appetite and reduce margin-call sensitivity.

Keep Liquidity Outside the Portfolio

Holding cash or near-cash reserves outside the pledged portfolio can help meet a margin call without forcing the sale of investments during a market downturn.

Agree a Clear Repayment Route

If the facility is linked to a property purchase, business event or tax planning requirement, the exit route should be clear before the facility is drawn.

Stress Test the Portfolio

Before applying, model what happens if the portfolio falls by 10%, 20% or 30%. This helps identify whether the proposed borrowing level is robust or too aggressive.

Understand Lender Triggers

Different lenders use different monitoring rules, margin-call levels and cure periods. These should be understood before signing facility documents.

Practical point: margin-call risk is usually reduced by structure, not hope. A lower initial LTV, diversified collateral, external liquidity reserve and clear repayment plan can make the difference between a facility that remains manageable and one that becomes vulnerable during market volatility.

Concentration and Eligibility Risks


Not all securities are equal in the eyes of lenders. Portfolios heavily concentrated in a single asset or sector may be deemed higher risk. Volatile securities, emerging market equities, or private funds may be excluded entirely.


This creates two risks. The first is that clients expecting high loan-to-value may find facilities capped at lower levels. The second is that if the “eligible” portion of the portfolio declines disproportionately, the facility may become more vulnerable to margin calls.


For example, a borrower with a technology-heavy portfolio may secure an SBL facility in buoyant markets, only to face aggressive collateral calls if the sector corrects. In contrast, portfolios diversified with bonds or blue-chip equities tend to support more stable lending.


Short-Term Nature and Repayment Pressures


Most securities backed loans are short- to medium-term facilities, typically lasting one to three years. This creates another layer of risk: repayment or refinancing pressure at maturity.


If markets have declined, refinancing may be more difficult or more expensive. If the client intended to repay from another transaction — such as a property sale or business exit — delays in those events can create liquidity strain.


For this reason, SBL should never be treated as open-ended liquidity. It works best when part of a carefully structured plan, often bridging to long-term solutions such as large mortgage loans, development finance, or portfolio mortgages.


Currency and Cross-Border Risks


Cross-border lending introduces additional challenges. Borrowers may pledge assets in dollars or euros while drawing loans in sterling. This can reduce immediate FX risk for a property purchase but creates exposure if exchange rates move during the life of the loan.


A client who borrows £5 million against a dollar portfolio at £1.25/$ may find their effective borrowing cost changes dramatically if sterling strengthens to £1.40/$. Such moves can make repayment more expensive and undermine the facility’s efficiency.


This is why many international buyers now view SBL as complementary to other solutions, such as international property finance, rather than a standalone answer.


Strategies to Protect Yourself


Understanding the risks is only half the battle. The most successful clients are those who build protections into their strategy from the outset.

Diversification is essential. A broad mix of equities, bonds, and funds supports more stable lending than concentrated or volatile portfolios. This reduces the likelihood of sharp margin calls.


Liquidity buffers are equally important. Clients should maintain accessible cash or near-cash reserves, separate from the pledged portfolio, to meet margin calls without forced sales.


Conservative loan-to-value ratios provide another safeguard. While lenders may offer up to 70%, many sophisticated clients choose to borrow less — 50% or below — to withstand volatility.


Finally, alignment with broader finance ensures that SBL fits into a coherent plan. Facilities should ideally be temporary, bridging to long-term solutions such as interest-only mortgages or refinancing once transactions complete.

Questions To Ask A Lender Before Signing

Many margin-call disputes and unexpected outcomes occur because borrowers focus on the interest rate but fail to fully understand how the facility operates during periods of market stress.

1

What Is The Actual Margin Call Threshold?

Understand the precise loan-to-value level that triggers lender intervention and whether different thresholds apply to different asset classes.

2

How Much Time Is Allowed To Remedy A Margin Call?

Some lenders allow a short cure period while others may act more quickly. Understanding the response timeframe is critical.

3

Can Assets Be Sold Without My Consent?

Understand under what circumstances the lender can liquidate investments and whether notice is provided beforehand.

4

How Frequently Is The Portfolio Monitored?

Monitoring policies vary between lenders and can materially affect how quickly issues are identified during volatile markets.

5

What Assets Are Eligible Collateral?

Clarify whether all holdings qualify equally and whether certain assets may be subject to reduced lending values or exclusion.

6

What Happens If Markets Become Extremely Volatile?

Ask the lender how facilities were managed during previous periods of market stress and what protections exist for borrowers.

Experienced borrowers often focus as much on the lender's operational approach as the interest rate. Understanding margin-call procedures, monitoring policies and enforcement rights can be just as important as achieving competitive pricing.

A Real-World Example


A UK-based entrepreneur holds a £12 million global portfolio. They wish to purchase a £7 million London property and arrange a £5 million SBL facility at 60% LTV.


Six months later, equity markets fall by 15%, reducing the portfolio’s value to £10.2 million. The loan-to-value rises to 72%, breaching the lender’s covenant. A margin call is issued, requiring a £600,000 top-up.


Fortunately, the client has maintained a £1 million liquidity reserve, which is used to meet the call. This prevents forced sales and keeps the facility intact. A year later, markets recover, and the property is refinanced into a long-term mortgage, allowing the SBL to be repaid.


This scenario demonstrates both the risks and the protections available. Without the liquidity reserve, the client might have been forced to sell assets at a loss. With planning, the facility worked exactly as intended.


How Willow Can Help


At Willow Private Finance, we structure securities backed lending with risk management in mind. We work closely with private banks, investment banks, and specialist lenders to secure terms that reflect both opportunity and protection.


Our role is not just to source facilities, but to ensure they integrate into broader wealth and property strategies. This means advising on loan-to-value ratios, portfolio eligibility, and repayment planning.


Frequently Asked Questions


Why is market volatility a central risk in securities backed lending (SBL)?
Because the value of the pledged portfolio can decline sharply, increasing the effective loan-to-value (LTV) and triggering margin calls or forced liquidation. Willow Private Finance


How do margin calls function, and what’s the danger?
When portfolio value drops below agreed thresholds, lenders can require borrowers to top up collateral or reduce the loan. If the borrower cannot comply, the lender may liquidate assets—often at depressed prices. Willow Private Finance


What is concentration risk in SBL, and why does it matter?
Lenders often limit which securities are eligible. Portfolios concentrated in volatile sectors or single names may face stricter caps or excluded assets, making the facility more vulnerable. Willow Private Finance


What repayment or refinancing risks exist?
SBL facilities are often short- to mid-term (1–3 years). If the borrower’s exit plan (e.g. refinancing, property sale) is delayed—or markets weaken—there may be difficulty repaying or rolling over the loan. Willow Private Finance


How do cross-currency and jurisdictional factors introduce extra risk?
If a borrower pledges assets in one currency (e.g. USD) but the loan is denominated in another (e.g. GBP), exchange rate moves can amplify the effective cost or value mismatch. Willow Private Finance


What strategies can borrowers use to protect themselves from these risks?



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About the Author: Wesley Ranger


Wesley Ranger is the Co-Founder and Director of Willow Private Finance. With over 20 years of experience advising high-net-worth clients, international investors, and complex borrowers, Wesley specialises in structuring bespoke property and investment finance solutions. His expertise in securities backed lending, private bank facilities, and cross-border strategies makes him a trusted adviser for clients navigating complex financial risks.



Important Notice

The information contained in this article is for general guidance only and does not constitute financial or investment advice. Securities backed lending facilities are subject to lender criteria, portfolio eligibility, market volatility, and regulatory requirements. Borrowers should be aware of the risks of margin calls, repayment obligations, and currency movements. Always seek professional legal, tax, and financial advice before entering into any lending arrangement.