What Is Naked Short Selling? Meaning and Rules Explained

Naked short selling happens when someone sells shares without arranging to borrow them in time for settlement. Unlike a conventional short sale, the seller hasn’t secured a borrow or a locate (a documented check that the shares can be borrowed). This can result in a failure to deliver, although not all delivery failures involve naked shorting.

Regulators impose strict requirements on short selling to reduce settlement failures and protect market integrity. However, the rules differ between jurisdictions, and naked short selling is not automatically illegal in every circumstance.

Here’s naked short selling explained: how it works, why regulators restrict it, what happens when shares aren’t delivered, and how it differs from short positions taken through Contracts for Difference (CFDs).

What Is Naked Short Selling?

Naked short selling is the sale of shares without having borrowed them or made adequate arrangements to borrow them in time for settlement.

To understand the difference, it helps to look at how conventional short selling works.

In a typical short sale, a trader sells shares they do not own, expecting to buy them back later at a lower price. Their broker arranges access to the shares through the securities lending market so they can be delivered when the trade settles.

For example, a trader might sell 100 borrowed shares at $50 each, receiving $5,000 from the sale. If the share price falls to $40, the trader could buy back the same number of shares for $4,000.

This gives the trader a gross gain of $1,000, before borrowing fees, commissions and other trading costs. If the share price rises instead, the trader makes a loss.

With naked short selling, the seller has not made the necessary borrowing or locate arrangements. If they cannot obtain the shares before settlement, the transaction may result in a failure to deliver.

Covered vs Naked Short Selling: What Is the Difference?

An important distinction is that a standard short sale does not always require the shares to have been borrowed before the trade is placed. Depending on the jurisdiction, a valid locate or other permitted arrangement may be sufficient, provided the relevant requirements are met.

What Does Regulation SHO Say About Naked Short Selling?

In the United States, the Securities and Exchange Commission (SEC) regulates short selling through Regulation SHO.

Under Rule 203(b)(1), broker-dealers generally need reasonable grounds to believe that shares can be borrowed and delivered by the settlement date before carrying out a short sale. They must also document the locate.

However, Regulation SHO provides certain exceptions, including for qualifying bona fide market-making activities.

Uncovered short selling is therefore not automatically unlawful under US federal securities rules in every circumstance. Nevertheless, trading without a required locate, failing to meet close-out obligations or using short sales to manipulate prices may breach those rules.

The SEC explains these requirements in its guidance on Regulation SHO.

On 13 July 2026, the UK's Short Selling Regulations 2025 and the FCA's Short Selling Rules Sourcebook came into force.

Under the FCA's covering requirements, a person selling shares covered by the rules must have borrowed them, agreed to borrow them or established another permitted arrangement that provides reasonable assurance of timely settlement.

The EU has similar restrictions on uncovered short sales under Article 12 of its Short Selling Regulation.

How Does Naked Short Selling Work?

A naked short sale can be executed in the market like an ordinary share transaction. Without adequate borrowing arrangements, the seller risks a settlement failure and may breach applicable short-selling rules.

The settlement deadline matters because the seller must meet their delivery obligation, regardless of whether the share price has moved in their favour.

What Happens Between Trade Execution and Settlement?

The process generally involves four stages:

1. Trade execution: A sell order is matched with a buyer through a trading venue or another permitted execution arrangement. The transaction may proceed even if the seller has not secured the necessary shares.
2. Clearing: The transaction passes through the relevant clearing arrangements. Where a central counterparty is involved, it manages obligations between clearing participants and may net transactions before settlement.
3. Settlement: The seller's clearing participant must deliver the required shares, while the buyer's side must meet its payment obligation.
4. Failure to deliver (FTD): If the shares are not delivered when due, a failure to deliver is recorded in the settlement system, leaving an outstanding delivery obligation. The responsible participant must then resolve the failure in accordance with the applicable rules.

A failure to deliver does not always mean uncovered short selling has occurred. Settlement failures can also result from processing problems, delayed transfers or difficulties delivering shares that were legitimately borrowed.

Similarly, selling short without an adequate borrowing arrangement does not necessarily mean settlement will fail. The seller might still obtain the shares in time, although the original trade may have breached an applicable locate or covering requirement.

How Long Does Settlement Take?

Settlement periods depend on the market in which the shares are traded.

T+1 means that a trade normally settles one business day after execution, while T+2 allows two business days.

The US introduced T+1 settlement on 28 May 2024. The UK and EU are scheduled to move to T+1 on 11 October 2027.

For example, a US equity trade executed on Monday would normally settle on Tuesday, provided neither day is affected by a market holiday.

Shorter settlement periods reduce the time available to complete delivery arrangements, making effective borrowing and settlement processes particularly important.

Are Market Makers Exempt From Naked Short Selling Rules?

Some regulatory frameworks provide exemptions for qualifying market-making activities.

Market makers help provide liquidity by standing ready to buy or sell securities. In certain circumstances, they may need to sell shares before arranging a borrow, particularly when responding to customer demand in less liquid markets.

In the US, Regulation SHO provides a locate exemption for qualifying bona fide market-making activities. The UK also recognises certain market-making exemptions within its short-selling framework.

These exemptions are subject to specific conditions. They do not provide unrestricted permission to maintain settlement failures or manipulate share prices.

Covered Short Selling vs CFD Trading

Opening a short position through a retail CFD account is not the same as selling shares short on the underlying equity market.

A Contract for Difference (CFD) is a cash-settled derivative that allows traders to speculate on price movements without owning the underlying asset.

When you open a short CFD position, you enter into an agreement with the CFD provider based on the difference between the opening and closing prices.

If the underlying price falls, the position may produce a gain. If it rises, the position produces a loss.

The retail trader does not need to borrow or deliver the underlying shares to settle the CFD contract.

This means that opening a short CFD position does not, by itself, constitute naked short selling.

However, CFD providers may hedge their exposure by trading or borrowing the underlying shares. Any such activity must comply with the relevant securities market rules.

Can Share Borrowing Costs Affect CFD Trading?

Yes. Although CFD traders do not borrow the underlying shares themselves, borrowing conditions can influence the costs and availability of short share CFDs.

When a share becomes difficult to borrow, lenders may charge higher fees. Some CFD providers pass these costs on to clients through additional borrow charges.

Trading costs can include:

• Spread: The difference between the buy and sell prices.
• Commission: A separate charge for opening or closing a position, where applicable.
• Overnight funding: A charge or credit associated with holding a CFD position overnight.
• Share borrowing charges: Additional fees that may apply to short share CFDs, particularly when the underlying shares are difficult to borrow.

These costs vary between providers and instruments. Borrowing charges and overnight funding should not be treated as the same fee, as a provider may calculate and apply them separately.

A shortage of borrowable shares can also cause a CFD provider to increase charges, restrict new short positions or change the conditions for maintaining existing exposure.

So before you open a position, check the full cost structure and your provider’s short-selling terms.

Why Is Naked Short Selling Restricted?

Regulators restrict uncovered short selling primarily to support reliable settlement and reduce the risk of market abuse.

Ordinary short selling serves legitimate purposes, including hedging, liquidity provision and price discovery. The concern with uncovered short selling is that shares may be sold without adequate arrangements to meet the resulting delivery obligations.

Market Manipulation

Abusive short-selling practices can be used to create misleading selling pressure or distort market prices.

For example, coordinated or deceptive selling activity intended to drive a share price down may constitute market manipulation.

On their own, falling share prices or high short interest (how much of a company’s stock is currently sold short) don’t prove that naked shorting or manipulation has taken place. Prices can decline for many legitimate reasons.

Settlement Failures and Counterparty Risk

A failure to deliver leaves an outstanding obligation within the settlement system.

If delivery failures persist, they can increase operational costs and expose clearing participants to additional risk.

Unresolved delivery obligations can also complicate the reconciliation of securities positions. However, a failed delivery does not create newly issued shares or automatically duplicate shareholder voting rights.

Regulatory Close-Out Requirements

In the US, Regulation SHO includes requirements designed to prevent delivery failures from remaining unresolved.

Under Rule 204, clearing participants (the firms that settle trades through a clearing agency) generally have to close out a failure to deliver from a short sale. That means buying or borrowing the missing shares by the start of regular trading hours on the settlement day after the original settlement date.

Separate requirements apply to certain other settlement failures, including those associated with bona fide market-making activities.

The SEC also maintains additional close-out requirements for securities with large and persistent failures to deliver, known as threshold securities.

Under Rule 203(b)(3), if a security remains on the threshold list for 13 consecutive settlement days and a clearing participant has an outstanding failure to deliver on each of those days, the participant must take immediate steps to close out the failure by purchasing shares.

Appearing on a threshold securities list does not, by itself, prove that a company has been affected by abusive naked shorting.

What Are the Risks of Short Selling?

Short selling carries substantial risks, whether the position involves borrowed shares or a derivative such as a CFD.

Unlike buying shares outright, where the maximum loss is generally the amount invested, a conventional short share position can theoretically generate unlimited losses because there is no fixed upper limit to a share price.

For leveraged CFDs, losses can also be substantial relative to the margin deposited to open a position.

In the UK, retail clients trading CFDs with FCA-regulated providers benefit from negative balance protection, which limits their liability to the funds held in the relevant CFD trading account. This protection does not prevent the entire account balance from being lost.

Borrowing Costs and Share Availability

Share availability is an important consideration for anyone maintaining a conventional short position.

When demand to borrow a particular share increases, available lending supply may become limited. This can result in higher borrowing fees or changes to the terms under which shares are available.

Lenders may also recall borrowed shares, while brokers can change margin requirements or require short positions to be closed if borrowing arrangements cannot be maintained.

These developments can make an existing short position more expensive or difficult to manage.

Rising borrowing fees may indicate that a share is becoming harder to borrow, but they are not a reliable way to predict when a short squeeze will occur.

For retail traders using short share CFDs, similar pressures may appear through higher borrow charges, changes to trading conditions or restrictions on short positions, depending on the provider.

Short Squeezes

A short squeeze occurs when a rising share price prompts short sellers to buy back shares to close their positions, adding further buying pressure.

This can happen when unexpected positive news, strong investor demand or a shortage of available shares causes the price to rise sharply.

As short sellers rush to limit their losses, their buying activity may accelerate the price increase.

A short squeeze can develop quickly, particularly in shares with high short interest and limited liquidity.

Leverage and CFD Losses

Leverage allows traders to control a larger market position with a smaller initial deposit.

While this increases exposure to potential gains, it also increases exposure to losses. Even a relatively small adverse price movement can lead to a substantial loss compared with the margin initially deposited.

CFDs are particularly risky for retail traders.

In December 2022, the UK's Financial Conduct Authority (FCA) reported that approximately 80% of customers lost money when trading CFDs.

This was a historical industry-level estimate, not a fixed loss rate for every provider. Under FCA rules, CFD firms must publish their own up-to-date retail client loss percentages in the required risk disclosures.

The FCA also requires regulated providers to apply safeguards for retail clients, including leverage limits, margin close-out rules and negative balance protection.

Before you trade, check how these protections work, what costs apply and how quickly losses can affect your account.

Conclusion

Naked short selling involves selling shares without making adequate borrowing arrangements in time for settlement. It differs from conventional covered short selling, where borrowing or locate arrangements support the seller's delivery obligations.

The practice raises concerns because it can contribute to settlement failures and, in abusive circumstances, market manipulation. However, not every failure to deliver results from naked shorting, and regulatory treatment varies between markets.

If you trade CFDs, you don’t borrow or deliver the underlying shares yourself. Even so, borrowing shortages can affect the costs and availability of short share CFDs, so it helps to know how your provider prices and manages these positions.

Our CFD broker reviews examine trading costs, platform features and the conditions offered by different providers.