[424B2] BARCLAYS BANK PLC Prospectus Supplement

Rhea-AI Filing Summary

Barclays Bank PLC plans to issue unsecured Global Medium‑Term Notes, Series A linked to the S&P 500 Futures Excess Return Index. Key dates are an Initial Valuation Date of October 30, 2025, an Issue Date of November 4, 2025, a Final Valuation Date of October 30, 2028, and a Maturity Date of November 2, 2028. The notes are sold in $1,000 denominations.

At maturity, holders receive: if the index return is at least 0.00%, $1,000 + ($1,000 × index return × 1.07); if the return is below 0.00% but not worse than -6.75%, $1,000 + ($1,000 × index return); if worse than -6.75%, the Minimum Payment at Maturity is $932.50 per $1,000 note. Investors can lose up to 6.75% of principal. The price to public is 100.00% of face value; the agent’s commission is 0.90%, with issuer proceeds of 99.10% per note. Barclays’ estimated value on the pricing date is expected to be $922.30–$982.30 per note. The notes will not be listed. Payments are subject to Barclays’ credit and consent to any U.K. Bail‑in Power by the relevant U.K. resolution authority.

The information in this preliminary pricing supplement is not complete and may be changed. This preliminary pricing supplement and the accompanying prospectus and prospectus supplement do not constitute an offer to sell these Notes, and we are not soliciting an offer to buy these Notes in any state where the offer or sale is not permitted.

Subject to Completion
Preliminary Pricing Supplement dated October 22, 2025

Preliminary Pricing Supplement (To the Prospectus dated May 15, 2025 and the Prospectus Supplement dated May 15, 2025)		Filed Pursuant to Rule 424(b)(2) Registration No. 333-287303
	$[●] Notes due November 2, 2028 Linked to the S&P 500® Futures Excess Return Index Global Medium-Term Notes, Series A

Terms used in this pricing supplement, but not defined herein, shall have the meanings ascribed to them in the prospectus supplement.

Issuer:	Barclays Bank PLC
Denominations:	Minimum denomination of $1,000, and integral multiples of $1,000 in excess thereof
Initial Valuation Date:*	October 30, 2025
Issue Date:	November 4, 2025
Final Valuation Date:*	October 30, 2028
Maturity Date:*	November 2, 2028
Reference Asset:	The S&P 500® Futures Excess Return Index (Bloomberg ticker symbol “SPXFP <Index>”)
Payment at Maturity:	If you hold the Notes to maturity, you will receive on the Maturity Date a cash payment per $1,000 principal amount Note that you hold determined as follows: ■If the Reference Asset Return of the Reference Asset is greater than or equal to 0.00%, you will receive an amount per $1,000 principal amount Note calculated as follows: $1,000 + [$1,000 × Reference Asset Return of the Reference Asset × Upside Leverage Factor] ■If the Reference Asset Return of the Reference Asset is less than 0.00%, but greater than or equal to -06.75%, you will receive an amount per $1,000 principal amount Note calculated as follows: $1,000 + [$1,000 × Reference Asset Return of the Reference Asset] ■If the Reference Asset Return of the Reference Asset is less than -06.75%, you will receive an amount per $1,000 principal amount Note equal to the Minimum Payment at Maturity If the Reference Asset Return of the Reference Asset is less than 0.00%, you will lose 1.00% of the principal amount of your Notes for every 1.00% that the Reference Asset Return of the Reference Asset falls below 0.00%, subject to the Minimum Payment at Maturity. You may lose up to 6.75% of the principal amount of your Notes at maturity. Any payment on the Notes is not guaranteed by any third party and is subject to (a) the creditworthiness of Barclays Bank PLC and (b) the risk of exercise of any U.K. Bail-in Power (as described on page PS-4 of this pricing supplement) by the relevant U.K. resolution authority. If Barclays Bank PLC were to default on its payment obligations or become subject to the exercise of any U.K. Bail-in Power (or any other resolution measure) by the relevant U.K. resolution authority, you might not receive any amounts owed to you under the Notes. See “Consent to U.K. Bail-in Power” and “Selected Risk Considerations” in this pricing supplement and “Risk Factors” in the accompanying prospectus supplement for more information.
Consent to U.K. Bail-in Power:	Notwithstanding and to the exclusion of any other term of the Notes or any other agreements, arrangements or understandings between Barclays Bank PLC and any holder or beneficial owner of the Notes (or the trustee on behalf of the holders of the Notes), by acquiring the Notes, each holder or beneficial owner of the Notes acknowledges, accepts, agrees to be bound by, and consents to the exercise of, any U.K. Bail-in Power by the relevant U.K. resolution authority. See “Consent to U.K. Bail-in Power” on page PS-4 of this pricing supplement.

[Terms of the Notes Continue on the Next Page]

	Initial Issue Price(1)(2)	Price to Public	Agent’s Commission(3)	Proceeds to Barclays Bank PLC
Per Note	$1,000	100.00%	0.90%	99.10%
Total	$[●]	$[●]	$[●]	$[●]

(1)Because dealers who purchase the Notes for sale to certain fee-based advisory accounts may forgo some or all selling concessions, fees or commissions, the public offering price for investors purchasing the Notes in such fee-based advisory accounts may be between $991.00 and $1,000 per Note. Investors that hold their Notes in fee-based advisory or trust accounts may be charged fees by the investment advisor or manager of such account based on the amount of assets held in those accounts, including the Notes.

(2)Our estimated value of the Notes on the Initial Valuation Date, based on our internal pricing models, is expected to be between $922.30 and $982.30 per Note. The estimated value is expected to be less than the initial issue price of the Notes. See “Additional Information Regarding Our Estimated Value of the Notes” on page PS–5 of this pricing supplement.

(3)Barclays Capital Inc. will receive commissions from the Issuer of up to $9.00 per $1,000 principal amount Note. Barclays Capital Inc. will use these commissions to pay variable selling concessions or fees (including custodial or clearing fees) to other dealers. The actual commission received by Barclays Capital Inc. will be equal to the selling concession paid to such dealers.

Investing in the Notes involves a number of risks. See “Risk Factors” beginning on page S-9 of the prospectus supplement and “Selected Risk Considerations” beginning on page PS-10 of this pricing supplement.

The Notes will not be listed on any U.S. securities exchange or quotation system. Neither the U.S. Securities and Exchange Commission (the “SEC”) nor any state securities commission has approved or disapproved of these Notes or determined that this pricing supplement is truthful or complete. Any representation to the contrary is a criminal offense.

The Notes constitute our unsecured and unsubordinated obligations. The Notes are not deposit liabilities of Barclays Bank PLC and are not covered by the U.K. Financial Services Compensation Scheme or insured by the U.S. Federal Deposit Insurance Corporation or any other governmental agency or deposit insurance agency of the United States, the United Kingdom or any other jurisdiction.

Terms of the Notes, Continued
Initial Value:	[●], the Closing Value of the Reference Asset on the Initial Valuation Date
Final Value:	The Closing Value of the Reference Asset on the Final Valuation Date
Closing Value:	The term “Closing Value” means the closing level of the Reference Asset, as further described under “Reference Assets—Indices—Special Calculation Provisions” in the prospectus supplement.
Upside Leverage Factor:	1.07
Minimum Payment at Maturity:	$932.50 per $1,000 principal amount Note
Reference Asset Return:	The performance of the Reference Asset from the Initial Value to the Final Value, calculated as follows: Final Value – Initial Value Initial Value
Calculation Agent:	Barclays Bank PLC
CUSIP / ISIN:	06746EJ48 / US06746EJ484

*Subject to postponement, as described under “Additional Terms of the Notes” in this pricing supplement

ADDITIONAL DOCUMENTS RELATED TO THE OFFERING OF THE NOTES

You should read this pricing supplement together with the prospectus dated May 15, 2025 as supplemented by the documents listed below, relating to our Global Medium-Term Notes, Series A, of which these Notes are a part. This pricing supplement, together with the documents listed below, contains the terms of the Notes and supersedes all prior or contemporaneous oral statements as well as any other written materials including preliminary or indicative pricing terms, correspondence, trade ideas, structures for implementation, sample structures, brochures or other educational materials of ours. You should carefully consider, among other things, the matters set forth under “Risk Factors” in the prospectus supplement and “Selected Risk Considerations” in this pricing supplement, as the Notes involve risks not associated with conventional debt securities. We urge you to consult your investment, legal, tax, accounting and other advisors before you invest in the Notes.

You may access these documents on the SEC website at www.sec.gov as follows (or if such address has changed, by reviewing our filings for the relevant date on the SEC website):

●Prospectus dated May 15, 2025:

http://www.sec.gov/Archives/edgar/data/312070/000119312525120720/d925982d424b2.htm

●Prospectus Supplement dated May 15, 2025:

http://www.sec.gov/Archives/edgar/data/312070/000095010325006051/dp228678_424b2-prosupp.htm

Our SEC file number is 1–10257. As used in this pricing supplement, “we,” “us” or “our” refers to Barclays Bank PLC.

PS–3

CONSENT TO U.K. BAIL-IN POWER

Notwithstanding and to the exclusion of any other term of the Notes or any other agreements, arrangements or understandings between us and any holder or beneficial owner of the Notes (or the trustee on behalf of the holders of the Notes), by acquiring the Notes, each holder or beneficial owner of the Notes acknowledges, accepts, agrees to be bound by, and consents to the exercise of, any U.K. Bail-in Power by the relevant U.K. resolution authority.

Under the U.K. Banking Act 2009, as amended, the relevant U.K. resolution authority may exercise a U.K. Bail-in Power in circumstances in which the relevant U.K. resolution authority is satisfied that the resolution conditions are met. These conditions include that a U.K. bank or investment firm is failing or is likely to fail to satisfy the Financial Services and Markets Act 2000 (the “FSMA”) threshold conditions for authorization to carry on certain regulated activities (within the meaning of section 55B FSMA) or, in the case of a U.K. banking group company that is a European Economic Area (“EEA”) or third country institution or investment firm, that the relevant EEA or third country relevant authority is satisfied that the resolution conditions are met in respect of that entity.

The U.K. Bail-in Power includes any write-down, conversion, transfer, modification and/or suspension power, which allows for (i) the reduction or cancellation of all, or a portion, of the principal amount of, or interest on, or any other amounts payable on, the Notes; (ii) the conversion of all, or a portion, of the principal amount of, or interest on, or any other amounts payable on, the Notes into shares or other securities or other obligations of Barclays Bank PLC or another person (and the issue to, or conferral on, the holder or beneficial owner of the Notes of such shares, securities or obligations); (iii) the cancellation of the Notes and/or (iv) the amendment or alteration of the maturity of the Notes, or the amendment of the amount of interest or any other amounts due on the Notes, or the dates on which interest or any other amounts become payable, including by suspending payment for a temporary period; which U.K. Bail-in Power may be exercised by means of a variation of the terms of the Notes solely to give effect to the exercise by the relevant U.K. resolution authority of such U.K. Bail-in Power. Each holder and beneficial owner of the Notes further acknowledges and agrees that the rights of the holders or beneficial owners of the Notes are subject to, and will be varied, if necessary, solely to give effect to, the exercise of any U.K. Bail-in Power by the relevant U.K. resolution authority. For the avoidance of doubt, this consent and acknowledgment is not a waiver of any rights holders or beneficial owners of the Notes may have at law if and to the extent that any U.K. Bail-in Power is exercised by the relevant U.K. resolution authority in breach of laws applicable in England.

For more information, please see “Selected Risk Considerations—Risks Relating to the Issuer—You May Lose Some or All of Your Investment If Any U.K. Bail-in Power Is Exercised by the Relevant U.K. Resolution Authority” in this pricing supplement as well as “U.K. Bail-in Power,” “Risk Factors—Risks Relating to the Securities Generally—Regulatory action in the event a bank or investment firm in the Group is failing or likely to fail, including the exercise by the relevant U.K. resolution authority of a variety of statutory resolution powers, could materially adversely affect the value of any securities” and “Risk Factors—Risks Relating to the Securities Generally—Under the terms of the securities, you have agreed to be bound by the exercise of any U.K. Bail-in Power by the relevant U.K. resolution authority” in the accompanying prospectus supplement.

PS–4

ADDITIONAL INFORMATION REGARDING OUR ESTIMATED VALUE OF THE NOTES

The range of the estimated values of the Notes referenced above may not correlate on a linear basis with the range of any other term of the Notes as may be set forth in this pricing supplement. We determined the size of such range based on prevailing market conditions, as well as the anticipated duration of the marketing period for the Notes. The final terms for the Notes will be determined on the date the Notes are initially priced for sale to the public, which we refer to as the Initial Valuation Date, based on prevailing market conditions on or prior to the Initial Valuation Date, and will be communicated to investors either orally or in a final pricing supplement.

Our internal pricing models take into account a number of variables and are based on a number of subjective assumptions, which may or may not materialize, typically including volatility, interest rates, and our internal funding rates. Our internal funding rates (which are our internally published borrowing rates based on variables such as market benchmarks, our appetite for borrowing, and our existing obligations coming to maturity) may vary from the levels at which our benchmark debt securities trade in the secondary market. Our estimated value on the Initial Valuation Date is based on our internal funding rates. Our estimated value of the Notes may be lower if such valuation were based on the levels at which our benchmark debt securities trade in the secondary market.

Our estimated value of the Notes on the Initial Valuation Date is expected to be less than the initial issue price of the Notes. The difference between the initial issue price of the Notes and our estimated value of the Notes is a result of several factors, including any sales commissions to be paid to Barclays Capital Inc. or another affiliate of ours, any selling concessions, discounts, commissions or fees (including any structuring or other distribution related fees) to be allowed or paid to non-affiliated intermediaries, the estimated profit that we or any of our affiliates expect to earn in connection with structuring the Notes, the estimated cost which we may incur in hedging our obligations under the Notes, and estimated development and other costs which we may incur in connection with the Notes.

Our estimated value on the Initial Valuation Date is not a prediction of the price at which the Notes may trade in the secondary market, nor will it be the price at which Barclays Capital Inc. may buy or sell the Notes in the secondary market. Subject to normal market and funding conditions, Barclays Capital Inc. or another affiliate of ours intends to offer to purchase the Notes in the secondary market but it is not obligated to do so.

Assuming that all relevant factors remain constant after the Initial Valuation Date, the price at which Barclays Capital Inc. may initially buy or sell the Notes in the secondary market, if any, and the value that we may initially use for customer account statements, if we provide any customer account statements at all, may exceed our estimated value on the Initial Valuation Date for a temporary period expected to be approximately six months after the Issue Date because, in our discretion, we may elect to effectively reimburse to investors a portion of the estimated cost of hedging our obligations under the Notes and other costs in connection with the Notes which we will no longer expect to incur over the term of the Notes. We made such discretionary election and determined this temporary reimbursement period on the basis of a number of factors, which may include the tenor of the Notes and/or any agreement we may have with the distributors of the Notes. The amount of our estimated costs which we effectively reimburse to investors in this way may not be allocated ratably throughout the reimbursement period, and we may discontinue such reimbursement at any time or revise the duration of the reimbursement period after the initial Issue Date of the Notes based on changes in market conditions and other factors that cannot be predicted.

We urge you to read the “Selected Risk Considerations” beginning on page PS-10 of this pricing supplement.

You may revoke your offer to purchase the Notes at any time prior to the Initial Valuation Date. We reserve the right to change the terms of, or reject any offer to purchase, the Notes prior to the Initial Valuation Date. In the event of any changes to the terms of the Notes, we will notify you and you will be asked to accept such changes in connection with your purchase. You may also choose to reject such changes in which case we may reject your offer to purchase.

PS–5

SELECTED PURCHASE CONSIDERATIONS

The Notes are not appropriate for all investors. The Notes may be an appropriate investment for you if all of the following statements are true:

●You do not seek an investment that produces periodic interest or coupon payments or other sources of current income.

●You anticipate that the Reference Asset Return of the Reference Asset will be greater than 0.00%.

●You understand and accept the risk that the payment at maturity will be based solely on the Reference Asset Return of the Reference Asset.

●You can tolerate a loss of up to 6.75% of your principal amount, and you are willing and able to make an investment that may have the downside market risk of an investment in the Reference Asset.

●You understand and accept that you will not be entitled to receive dividends or distributions that may be paid to holders of a Reference Asset or any securities to which a Reference Asset provides exposure, nor will you have any voting rights with respect to a Reference Asset or any securities to which a Reference Asset provides exposure.

●You understand and are willing and able to accept the risks associated with an investment linked to the performance of the Reference Asset.

●You can tolerate fluctuations in the price of the Notes prior to scheduled maturity that may be similar to or exceed the downside fluctuations in the value of the Reference Asset.

●You do not seek an investment for which there will be an active secondary market, and you are willing and able to hold the Notes to maturity.

●You are willing and able to assume our credit risk for all payments on the Notes.

●You are willing and able to consent to the exercise of any U.K. Bail-in Power by any relevant U.K. resolution authority.

The Notes may not be an appropriate investment for you if any of the following statements are true:

●You seek an investment that produces periodic interest or coupon payments or other sources of current income.

●You seek an investment that provides for the full repayment of principal at maturity, and/or you are unwilling or unable to accept the risk that you may lose up to 6.75% of the principal amount of the Notes in the event that the Reference Asset Return of the Reference Asset falls below 0.00%.

●You anticipate that the Reference Asset Return of the Reference Asset will be less than 0.00%.

●You do not understand and/or are unwilling or unable to accept the risks associated with an investment linked to the performance of the Reference Asset.

●You seek an investment that entitles you to dividends or distributions on, or voting rights related to a Reference Asset or any securities to which a Reference Asset provides exposure.

●You cannot tolerate fluctuations in the price of the Notes prior to scheduled maturity that may be similar to or exceed the downside fluctuations in the value of the Reference Asset.

●You seek an investment for which there will be an active secondary market, and/or you are unwilling or unable to hold the Notes to maturity.

●You prefer the lower risk, and therefore accept the potentially lower returns, of fixed income investments with comparable maturities and credit ratings.

●You are unwilling or unable to assume our credit risk for all payments on the Notes.

●You are unwilling or unable to consent to the exercise of any U.K. Bail-in Power by any relevant U.K. resolution authority.

You must rely on your own evaluation of the merits of an investment in the Notes. You should reach a decision whether to invest in the Notes after carefully considering, with your advisors, the appropriateness of the Notes in light of your investment objectives and the specific information set out in this pricing supplement and the documents referenced under “Additional Documents Related to the Offering of the Notes” in this pricing supplement. Neither the Issuer nor Barclays Capital Inc. makes any recommendation as to the appropriateness of the Notes for investment.

PS–6

ADDITIONAL TERMS OF THE NOTES

The Initial Valuation Date, the Final Valuation Date and the Maturity Date are subject to postponement in certain circumstances, as described under “Reference Assets—Indices—Market Disruption Events for Securities with an Equity Index as a Reference Asset” and “Terms of the Notes—Payment Dates” in the accompanying prospectus supplement.

In addition, the Reference Asset and the Notes are subject to adjustment by the Calculation Agent under certain circumstances, as described under “Reference Assets—Indices—Adjustments Relating to Securities with an Index as a Reference Asset” in the accompanying prospectus supplement.

PS–7

HYPOTHETICAL EXAMPLES OF AMOUNTS PAYABLE AT MATURITY

The following table illustrates the hypothetical payment at maturity under various circumstances. The “total return” as used in these examples, is the number, expressed as a percentage, that results from comparing the payment at maturity per $1,000 principal amount Note to $1,000. The hypothetical total returns set forth below are for illustrative purposes only and may not be the actual total returns applicable to a purchaser of the Notes. The numbers appearing in the following table and examples have been rounded for ease of analysis. The hypothetical examples below do not take into account any tax consequences from investing in the Notes and make the following key assumption:

■Hypothetical Initial Value of the Reference Asset: 100.00*

* The hypothetical Initial Value of 100.00 for the Reference Asset has been chosen for illustrative purposes only and does not represent a likely Initial Value for the Reference Asset. The actual Initial Value for the Reference Asset will be equal to the Closing Value on the Initial Valuation Date.

For information regarding recent values of the Reference Asset, please see “Information Regarding the Reference Asset” in this pricing supplement.

Final Value	Reference Asset Return	Payment at Maturity**	Total Return on the Notes
150.00	50.00%	$1,535.00	53.50%
140.00	40.00%	$1,428.00	42.80%
130.00	30.00%	$1,321.00	32.10%
120.00	20.00%	$1,214.00	21.40%
110.00	10.00%	$1,107.00	10.70%
100.00	0.00%	$1,000.00	0.00%
97.50	-2.50%	$975.00	-2.50%
95.00	-5.00%	$950.00	-5.00%
93.25	-6.75%	$932.50	-6.75%
90.00	-10.00%	$932.50	-6.75%
80.00	-20.00%	$932.50	-6.75%
70.00	-30.00%	$932.50	-6.75%
60.00	-40.00%	$932.50	-6.75%
50.00	-50.00%	$932.50	-6.75%
40.00	-60.00%	$932.50	-6.75%
30.00	-70.00%	$932.50	-6.75%
20.00	-80.00%	$932.50	-6.75%
10.00	-90.00%	$932.50	-6.75%
0.00	-100.00%	$932.50	-6.75%

** per $1,000 principal amount Note

The following examples illustrate how the payments at maturity set forth in the table above are calculated:

Example 1: The Final Value of the Reference Asset is 110.00.

Because the Reference Asset Return of the Reference Asset is greater than or equal to 0.00%, you will receive a payment at maturity of $1,107.00 per $1,000 principal amount Note that you hold, calculated as follows:

$1,000 + [$1,000 × Reference Asset Return of the Reference Asset × Upside Leverage Factor ]

$1,000 + [$1,000 × 10.00% × 1.07] = $1,107.00

The total return on investment of the Notes is 10.70%.

Example 2: The Final Value of the Reference Asset is 95.00.

Because the Reference Asset Return of the Reference Asset is less than 0.00%, but greater than or equal to -6.75%, you will receive a payment at maturity of $950.00 per $1,000 principal amount Note that you hold, calculated as follows:

PS–8

$1,000 + [$1,000 × Reference Asset Return of the Reference Asset]

$1,000 + [$1,000 × -5.00%] = $950.00

The total return on investment of the Notes is -5.00%.

Example 3: The Final Value of the Reference Asset is 40.00.

Because the Reference Asset Return of the Reference Asset is less than -06.75%, you will receive a payment at maturity of $932.50 per $1,000 principal amount Note that you hold, which is the Minimum Payment at Maturity.

The total return on investment of the Notes is -6.75%, which is the Minimum Payment at Maturity.

Example 3 demonstrates that, if the Reference Asset Return of the Reference Asset is less than 0.00%, you will lose 1.00% of the principal amount of your Notes for every 1.00% that the Reference Asset Return of the Reference Asset falls below 0.00%, subject to the Minimum Payment at Maturity.

You may lose up to 6.75% of the principal amount of your Notes. Any payment on the Notes, including the repayment of principal, is subject to the credit risk of Barclays Bank PLC.

PS–9

SELECTED RISK CONSIDERATIONS

An investment in the Notes involves significant risks. Investing in the Notes is not equivalent to investing directly in the Reference Asset or its components, if any. Some of the risks that apply to an investment in the Notes are summarized below, but we urge you to read the more detailed explanation of risks relating to the Notes generally in the “Risk Factors” section of the prospectus supplement. You should not purchase the Notes unless you understand and can bear the risks of investing in the Notes.

Risks Relating to the Notes Generally

●You May Lose up to 6.75% of the Principal Amount of Your Notes — The Notes differ from ordinary debt securities in that the Issuer will not necessarily repay the full principal amount of the Notes at maturity. If the Reference Asset Return of the Reference Asset is less than 0.00%, you will lose 1.00% of the principal amount of your Notes for every 1.00% that the Reference Asset Return of the Reference Asset falls below 0.00%, subject to the Minimum Payment at Maturity of $932.50 per $1,000 principal amount Note. You may lose up to 6.75% of the principal amount of your Notes.

●Any Payment on the Notes Will Be Determined Based on the Closing Values of the Reference Asset on the Dates Specified — Any payment on the Notes will be determined based on the Closing Values of the Reference Asset on the dates specified. You will not benefit from any more favorable values of the Reference Asset determined at any other time.

●Owning the Notes is Not the Same as Owning a Reference Asset or Any Securities to which a Reference Asset Provides Exposure — The return on the Notes may not reflect the return you would realize if you actually owned a Reference Asset or any securities to which a Reference Asset provides exposure. As a holder of the Notes, you will not have voting rights or rights to receive dividends or other distributions or any other rights that holders of a Reference Asset or any securities to which a Reference Asset provides exposure may have.

●Tax Treatment — As discussed further below under “Tax Considerations” and in the accompanying prospectus supplement, if you are a U.S. individual or taxable entity, under our intended treatment of the Notes, you will be required to accrue interest on a current basis in respect of the Notes over their term based on the comparable yield for the Notes and pay tax accordingly, even though you will not receive any payments from us until maturity. This comparable yield is determined solely to calculate the amount on which you will be taxed prior to maturity and is neither a prediction nor a guarantee of what the actual yield will be.

Risks Relating to the Issuer

●Credit of Issuer — The Notes are unsecured and unsubordinated debt obligations of the Issuer, Barclays Bank PLC, and are not, either directly or indirectly, an obligation of any third party. Any payment to be made on the Notes, including any repayment of principal, is subject to the ability of Barclays Bank PLC to satisfy its obligations as they come due and is not guaranteed by any third party. As a result, the actual and perceived creditworthiness of Barclays Bank PLC may affect the market value of the Notes, and in the event Barclays Bank PLC were to default on its obligations, you may not receive any amounts owed to you under the terms of the Notes.

●You May Lose Some or All of Your Investment If Any U.K. Bail-in Power Is Exercised by the Relevant U.K. Resolution Authority — Notwithstanding and to the exclusion of any other term of the Notes or any other agreements, arrangements or understandings between Barclays Bank PLC and any holder or beneficial owner of the Notes (or the trustee on behalf of the holders of the Notes), by acquiring the Notes, each holder or beneficial owner of the Notes acknowledges, accepts, agrees to be bound by, and consents to the exercise of, any U.K. Bail-in Power by the relevant U.K. resolution authority as set forth under “Consent to U.K. Bail-in Power” in this pricing supplement. Accordingly, any U.K. Bail-in Power may be exercised in such a manner as to result in you and other holders and beneficial owners of the Notes losing all or a part of the value of your investment in the Notes or receiving a different security from the Notes, which may be worth significantly less than the Notes and which may have significantly fewer protections than those typically afforded to debt securities. Moreover, the relevant U.K. resolution authority may exercise the U.K. Bail-in Power without providing any advance notice to, or requiring the consent of, the holders and beneficial owners of the Notes. The exercise of any U.K. Bail-in Power by the relevant U.K. resolution authority with respect to the Notes will not be a default or an Event of Default (as each term is defined in the senior debt securities indenture) and the trustee will not be liable for any action that the trustee takes, or abstains from taking, in either case, in accordance with the exercise of the U.K. Bail-in Power by the relevant U.K. resolution authority with respect to the Notes. See “Consent to U.K. Bail-in Power” in this pricing supplement as well as “U.K. Bail-in Power,” “Risk Factors—Risks Relating to the Securities Generally—Regulatory action in the event a bank or investment firm in the Group is failing or likely to fail, including the exercise by the relevant U.K. resolution authority of a variety of statutory resolution powers, could materially adversely affect the value of any securities” and “Risk Factors—Risks Relating to the Securities Generally—Under the terms of the securities, you have agreed to be bound by the exercise of any U.K. Bail-in Power by the relevant U.K. resolution authority” in the accompanying prospectus supplement.

Risks Relating to the Reference Asset

●Historical Performance of the Reference Asset Should Not Be Taken as Any Indication of the Future Performance of the Reference Asset Over the Term of the Notes — The value of the Reference Asset has fluctuated in the past and may, in the future, experience significant fluctuations. The historical performance of the Reference Asset is not an indication of the

PS–10

future performance of the Reference Asset over the term of the Notes. Therefore, the performance of the Reference Asset over the term of the Notes may bear no relation or resemblance to the historical performance of the Reference Asset.

●We May Accelerate the Notes If a Change-in-Law Event Occurs — Upon the occurrence of legal or regulatory changes that may, among other things, prohibit or otherwise materially restrict persons from holding the Notes or a Reference Asset or its components, or engaging in transactions in them, the Calculation Agent may determine that a change-in-law event has occurred and accelerate the Maturity Date for a payment determined by the Calculation Agent in its sole discretion. Any amount payable upon acceleration could be significantly less than any amount that would be due on the Notes if they were not accelerated. However, if the Calculation Agent elects not to accelerate the Notes, the value of, and any amount payable on, the Notes could be adversely affected, perhaps significantly, by the occurrence of those legal or regulatory changes. See “Terms of the Notes—Change-in-Law Events” in the accompanying prospectus supplement.

●The Reference Asset Reflects the Price Return of the Securities Composing the Reference Asset, Not the Total Return — The return on the Notes is based on the performance of the Reference Asset, which reflects changes in the market prices of the securities composing the Reference Asset. The Reference Asset is not a "total return" index that, in addition to reflecting those price returns, would also reflect dividends paid on the securities composing the Reference Asset. Accordingly, the return on the Notes will not include such a total return feature.

●Adjustments to the Reference Asset Could Adversely Affect the Value of the Notes — The sponsor of the Reference Asset may add, delete, substitute or adjust the securities composing the Reference Asset or make other methodological changes to the Reference Asset that could affect its value. The Calculation Agent will calculate the value to be used as the Closing Value of the Reference Asset in the event of certain material changes in or modifications to the Reference Asset. In addition, the sponsor of the Reference Asset may also discontinue or suspend calculation or publication of the Reference Asset at any time. Under these circumstances, the Calculation Agent may select a successor index that the Calculation Agent determines to be comparable to the Reference Asset or, if no successor index is available, the Calculation Agent will determine the value to be used as the Closing Value of the Reference Asset. Any of these actions could adversely affect the value of the Reference Asset and, consequently, the value of the Notes. See “Reference Assets—Indices—Adjustments Relating to Securities with an Index as a Reference Asset” in the accompanying prospectus supplement.

Risks Relating to Conflicts of Interest

●We and Our Affiliates May Engage in Various Activities or Make Determinations That Could Materially Affect the Notes in Various Ways and Create Conflicts of Interest — We and our affiliates play a variety of roles in connection with the issuance of the Notes, as described below. In performing these roles, our and our affiliates’ economic interests are potentially adverse to your interests as an investor in the Notes.

In connection with our normal business activities and in connection with hedging our obligations under the Notes, we and our affiliates make markets in and trade various financial instruments or products for our accounts and for the account of our clients and otherwise provide investment banking and other financial services with respect to these financial instruments and products. These financial instruments and products may include securities, derivative instruments or assets that may relate to the Reference Asset or its components, if any. In any such market making, trading and hedging activity, and other financial services, we or our affiliates may take positions or take actions that are inconsistent with, or adverse to, the investment objectives of the holders of the Notes. We and our affiliates have no obligation to take the needs of any buyer, seller or holder of the Notes into account in conducting these activities. Such market making, trading and hedging activity, investment banking and other financial services may negatively impact the value of the Notes.

In addition, the role played by Barclays Capital Inc., as the agent for the Notes, could present significant conflicts of interest with the role of Barclays Bank PLC, as issuer of the Notes. For example, Barclays Capital Inc. or its representatives may derive compensation or financial benefit from the distribution of the Notes and such compensation or financial benefit may serve as incentive to sell the Notes instead of other investments. Furthermore, we and our affiliates establish the offering price of the Notes for initial sale to the public, and the offering price is not based upon any independent verification or valuation.

In addition to the activities described above, we will also act as the Calculation Agent for the Notes. As Calculation Agent, we will determine any values of the Reference Asset and make any other determinations necessary to calculate any payments on the Notes. In making these determinations, the Calculation Agent may be required to make discretionary judgements relating to the Reference Asset, including those described in the accompanying prospectus supplement and this pricing supplement. In making these discretionary judgments, our economic interests are potentially adverse to your interests as an investor in the Notes, and any of these determinations may adversely affect any payments on the Notes.

Risks Relating to the Estimated Value of the Notes and the Secondary Market

●The Estimated Value of Your Notes is Expected to be Lower Than the Initial Issue Price of Your Notes — The estimated value of your Notes on the Initial Valuation Date is expected to be lower, and may be significantly lower, than the initial issue price of your Notes. The difference between the initial issue price of your Notes and the estimated value of the Notes is a result of certain factors, such as any sales commissions to be paid to Barclays Capital Inc. or another affiliate of ours, any selling concessions, discounts, commissions or fees (including any structuring or other distribution related fees) to be allowed or paid to non-affiliated intermediaries, the estimated profit that we or any of our affiliates expect to earn in connection with structuring

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the Notes, the estimated cost which we may incur in hedging our obligations under the Notes, and estimated development and other costs which we may incur in connection with the Notes.

●The Estimated Value of Your Notes Might be Lower if Such Estimated Value Were Based on the Levels at Which Our Debt Securities Trade in the Secondary Market — The estimated value of your Notes on the Initial Valuation Date is based on a number of variables, including our internal funding rates. Our internal funding rates may vary from the levels at which our benchmark debt securities trade in the secondary market. As a result of this difference, the estimated value referenced above might be lower if such estimated value were based on the levels at which our benchmark debt securities trade in the secondary market.

●The Estimated Value of the Notes is Based on Our Internal Pricing Models, Which May Prove to be Inaccurate and May be Different from the Pricing Models of Other Financial Institutions — The estimated value of your Notes on the Initial Valuation Date is based on our internal pricing models, which take into account a number of variables and are based on a number of subjective assumptions, which may or may not materialize. These variables and assumptions are not evaluated or verified on an independent basis. Further, our pricing models may be different from other financial institutions’ pricing models and the methodologies used by us to estimate the value of the Notes may not be consistent with those of other financial institutions which may be purchasers or sellers of Notes in the secondary market. As a result, the secondary market price of your Notes may be materially different from the estimated value of the Notes determined by reference to our internal pricing models.

●The Estimated Value of Your Notes Is Not a Prediction of the Prices at Which You May Sell Your Notes in the Secondary Market, if any, and Such Secondary Market Prices, If Any, Will Likely be Lower Than the Initial Issue Price of Your Notes and May be Lower Than the Estimated Value of Your Notes — The estimated value of the Notes will not be a prediction of the prices at which Barclays Capital Inc., other affiliates of ours or third parties may be willing to purchase the Notes from you in secondary market transactions (if they are willing to purchase, which they are not obligated to do). The price at which you may be able to sell your Notes in the secondary market at any time will be influenced by many factors that cannot be predicted, such as market conditions, and any bid and ask spread for similar sized trades, and may be substantially less than our estimated value of the Notes. Further, as secondary market prices of your Notes take into account the levels at which our debt securities trade in the secondary market, and do not take into account our various costs related to the Notes such as fees, commissions, discounts, and the costs of hedging our obligations under the Notes, secondary market prices of your Notes will likely be lower than the initial issue price of your Notes. As a result, the price at which Barclays Capital Inc., other affiliates of ours or third parties may be willing to purchase the Notes from you in secondary market transactions, if any, will likely be lower than the price you paid for your Notes, and any sale prior to the Maturity Date could result in a substantial loss to you.

●The Temporary Price at Which We May Initially Buy The Notes in the Secondary Market And the Value We May Initially Use for Customer Account Statements, If We Provide Any Customer Account Statements At All, May Not Be Indicative of Future Prices of Your Notes — Assuming that all relevant factors remain constant after the Initial Valuation Date, the price at which Barclays Capital Inc. may initially buy or sell the Notes in the secondary market (if Barclays Capital Inc. makes a market in the Notes, which it is not obligated to do) and the value that we may initially use for customer account statements, if we provide any customer account statements at all, may exceed our estimated value of the Notes on the Initial Valuation Date, as well as the secondary market value of the Notes, for a temporary period after the initial Issue Date of the Notes. The price at which Barclays Capital Inc. may initially buy or sell the Notes in the secondary market and the value that we may initially use for customer account statements may not be indicative of future prices of your Notes.

●Lack of Liquidity — The Notes will not be listed on any securities exchange. Barclays Capital Inc. and other affiliates of Barclays Bank PLC intend to make a secondary market for the Notes but are not required to do so, and may discontinue any such secondary market making at any time, without notice. Barclays Capital Inc. may at any time hold unsold inventory, which may inhibit the development of a secondary market for the Notes. Even if there is a secondary market, it may not provide enough liquidity to allow you to trade or sell the Notes easily. Because other dealers are not likely to make a secondary market for the Notes, the price at which you may be able to trade your Notes is likely to depend on the price, if any, at which Barclays Capital Inc. and other affiliates of Barclays Bank PLC are willing to buy the Notes. The Notes are not designed to be short-term trading instruments. Accordingly, you should be willing and able to hold your Notes to maturity.

●Many Economic and Market Factors Will Impact the Value of the Notes — The value of the Notes will be affected by a number of economic and market factors that interact in complex and unpredictable ways and that may either offset or magnify each other, including:

othe market price of, dividend rate on and expected volatility of the Reference Asset or the components of the Reference Asset, if any;

othe time to maturity of the Notes;

ointerest and yield rates in the market generally;

oa variety of economic, financial, political, regulatory or judicial events;

osupply and demand for the Notes; and

oour creditworthiness, including actual or anticipated downgrades in our credit ratings.

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INFORMATION REGARDING THE REFERENCE ASSET

S&P 500^® Futures Excess Return Index

The Reference Asset measures the performance of a rolling position in the nearest maturing quarterly E-mini^® S&P 500^® futures contracts trading on the Chicago Mercantile Exchange. E-mini^® S&P 500^® futures contracts are U.S. dollar-denominated futures contracts based on the S&P 500^® Index. The S&P 500^® Index consists of stocks of 500 companies selected to provide a performance benchmark for the U.S. equity markets. For more information about the Reference Asset, see Annex A in this pricing supplement.Historical Performance of the Reference Asset

The graph below sets forth the historical performance of the Reference Asset based on the daily Closing Value from January 6, 2020 through October 20, 2025. We obtained the Closing Values shown in the graph below from Bloomberg Professional^® service (“Bloomberg”). We have not independently verified the accuracy or completeness of the information obtained from Bloomberg.

Historical Performance of the S&P 500^® Futures Excess Return Index

PAST PERFORMANCE IS NOT INDICATIVE OF FUTURE RESULTS

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TAX CONSIDERATIONS

You should review carefully the sections in the accompanying prospectus supplement entitled “Material U.S. Federal Income Tax Consequences—Tax Consequences to U.S. Holders—Notes Treated as Indebtedness for U.S. Federal Income Tax Purposes” and, if you are a non-U.S. holder, “—Tax Consequences to Non-U.S. Holders.” The discussion below applies to you only if you are an initial purchaser of the Notes; if you are a secondary purchaser of the Notes, the tax consequences to you may be different. Notwithstanding that the Notes do not provide for the full repayment of their principal amount at maturity, we intend to treat the Notes as debt instruments for U.S. federal income tax purposes. Our special tax counsel, Davis Polk & Wardwell LLP has advised that it believes this treatment to be reasonable. The remainder of this discussion assumes that this treatment is correct.

Because the Notes will be offered to initial purchasers at varying prices, it is expected that the "issue price" of the Notes for U.S. federal income tax purposes will be uncertain. We currently intend to treat the issue price as $1,000 for each $1,000 principal amount Note, and the remainder of this discussion so assumes, unless otherwise indicated. Our intended treatment will affect the amounts you will be required to include in income for U.S. federal income tax purposes. You should consult your tax advisor regarding the uncertainty with respect to the Notes' issue price, including the tax consequences to you if the actual issue price of the Notes for U.S. federal income tax purposes is not $1,000 per Note.

Assuming the treatment described above is correct, and based on current market conditions, in the opinion of our special tax counsel, the Notes will be treated as “contingent payment debt instruments” for U.S. federal income tax purposes, as described under “—Contingent Payment Debt Instruments” in the accompanying prospectus supplement. The remainder of this discussion assumes that this treatment is correct.

Regardless of your method of accounting for U.S. federal income tax purposes, you generally will be required to accrue taxable interest income in each year on a constant yield to maturity basis at the “comparable yield,” as determined by us, even though we will not be required to make any payment with respect to the Notes prior to maturity. Upon a sale or exchange (including redemption at maturity), you generally will recognize taxable income or loss equal to the difference between the amount received from the sale or exchange and your adjusted tax basis in the Notes. You generally must treat any income as interest income and any loss as ordinary loss to the extent of previous interest inclusions, and the balance as capital loss. The deductibility of capital losses is subject to limitations.

The discussions herein and in the accompanying prospectus supplement do not address the consequences to taxpayers subject to special tax accounting rules under Section 451(b).

After the original issue date, you may obtain the comparable yield and the projected payment schedule by requesting them from Barclays Cross Asset Sales Americas, at (212) 528-7198. Neither the comparable yield nor the projected payment schedule constitutes a representation by us regarding the actual amount that we will pay on the Notes.

If you purchase Notes at their original issuance for an amount that is different from their issue price, you will be required to account for this difference by making adjustments to your income when the payment at maturity is made. You should consult your tax advisor regarding the treatment of the difference between your basis in your Notes and their issue price.

You should consult your tax advisor regarding the U.S. federal tax consequences of an investment in the Notes, as well as tax consequences arising under the laws of any state, local or non-U.S. taxing jurisdiction.

Non-U.S. holders. We do not believe that non-U.S. holders should be required to provide a Form W-8 in order to avoid 30% U.S. withholding tax with respect to the excess (if any) of the payment at maturity over the face amount of the Notes, although the Internal Revenue Service (the “IRS”) could challenge this position. However, non-U.S. holders should in any event expect to be required to provide appropriate Forms W-8 or other documentation in order to establish an exemption from backup withholding, as described under the heading “—Information Reporting and Backup Withholding” in the accompanying prospectus supplement. If any withholding is required, we will not be required to pay any additional amounts with respect to amounts withheld .

Treasury regulations under Section 871(m) generally impose a withholding tax on certain “dividend equivalents” under certain “equity linked instruments.” A recent IRS notice excludes from the scope of Section 871(m) instruments issued prior to January 1, 2027 that do not have a “delta of one” with respect to underlying securities that could pay U.S.-source dividends for U.S. federal income tax purposes (each an “Underlying Security”). Based on our determination that the Notes do not have a “delta of one” within the meaning of the regulations, we expect that these regulations will not apply to the Notes with regard to non-U.S. holders. Our determination is not binding on the IRS, and the IRS may disagree with this determination. Section 871(m) is complex and its application may depend on your particular circumstances, including whether you enter into other transactions with respect to an Underlying Security. If necessary, further information regarding the potential application of Section 871(m) will be provided in the pricing supplement for the Notes. You should consult your tax advisor regarding the potential application of Section 871(m) to the Notes.

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SUPPLEMENTAL PLAN OF DISTRIBUTION

We will agree to sell to Barclays Capital Inc. (the “Agent”), and the Agent will agree to purchase from us, the principal amount of the Notes, and at the price, specified on the cover of this pricing supplement. The Agent will commit to take and pay for all of the Notes, if any are taken.

Annex A

THE S&P 500^®FUTURES EXCESS RETURN INDEX

All information contained in this pricing supplement regarding the Underlier, including, without limitation, its make-up, method of calculation and changes in its components, has been derived from publicly available information, without independent verification. This information reflects the policies of, and is subject to change by, S&P Dow Jones Indices LLC (“S&P Dow Jones”). The Underlier is calculated, maintained and published by S&P Dow Jones. S&P Dow Jones has no obligation to continue to publish, and may discontinue the publication of, the Underlier.

The Underlier measures the performance of a rolling position in the nearest maturing quarterly E-mini^® S&P 500^® futures contracts (Symbol: ES) (the “Underlying Futures Contracts”) trading on the Chicago Mercantile Exchange (the “Exchange”). E-mini^®S&P 500^®futures contracts are U.S. dollar-denominated futures contracts based on the S&P 500^®Index. For more information about the S&P 500^® Index, see “Indices—The S&P U.S. Indices” in the accompanying underlying supplement. The Underlier is reported by Bloomberg under the ticker symbol “SPXFP.”

Index Rolling

As each Underlying Futures Contract approaches maturity, it is replaced by the next maturing Underlying Futures Contract in a process referred to as “rolling.” The rolling of the Underlier occurs quarterly over a one-day rolling period (the “roll day”) every March, June, September and December, effective after the close of trading five business days preceding the last trading date of the maturing Underlying Futures Contract, subject to adjustment in the case of holidays or market disruptions.

Index Calculations

The Underlier is an excess return index, meaning that its performance is based solely on changes in the daily contract price of its Underlying Futures Contract and positive or negative yields associated with rolling Underlying Futures Contracts. An excess return index is distinct from a total return index, which, in addition to reflecting those price and roll returns, would also reflect interest on a hypothetical cash position collateralizing the Underlying Futures Contracts.

The closing level of the Underlier on any trading day reflects the change in the daily contract price of the Underlying Futures Contract since the immediately preceding trading day. On each quarterly roll day, the closing level of the Underlier reflects the change from the daily contract price of the maturing Underlying Futures Contract on the immediately preceding trading day to the daily contract price of the next maturing Underlying Futures Contract on that roll day.

The daily contract price of an Underlying Futures Contract will be the settlement price reported by the Exchange. If the Exchange fails to open due to unforeseen circumstances, such as natural disasters, inclement weather, outages, or other events, the Underlier uses the prior daily contract prices. In situations where the Exchange is forced to close early due to unforeseen events, such as computer or electric power failures, weather conditions or other events, S&P Dow Jones calculates the closing level of the Underlier based on the daily contract prices published by the Exchange or, if no daily contract price is available, the Index Committee will determine the course of action.

Index Governance

An S&P Dow Jones index committee (the “Index Committee”) maintains the Underlier. All committee members are full-time professional members of S&P Dow Jones’ staff. The Index Committee may revise index policy covering rules for including currencies, the timing of rebalancing or other matters. The Index Committee considers information about changes to the Underlier and related matters to be potentially market moving and material. Therefore, all Index Committee discussions are confidential.

The Index Committees reserve the right to make exceptions when applying the methodology of the Underlier if the need arises. In any scenario where the treatment differs from the general rules stated in this document or supplemental documents, notice will be provided, whenever possible.

In addition to the daily governance of the Underlier and maintenance of its index methodology, at least once within any 12-month period, the Index Committee reviews the methodology to ensure the Underlier continues to achieve the stated objectives, and that the data and methodology remain effective. In certain instances, S&P Dow Jones may publish a consultation inviting comments from external parties.

License Agreement

The Underlier is a product of S&P Dow Jones and has been licensed for use by Barclays Bank PLC. “Standard & Poor’s,” “S&P” and “S&P 500” are registered trademarksof Standard & Poor’s Financial Services LLC (“SPFS”). These trademarks have been licensed to S&P Dow Jones and its affiliates and sublicensed to Barclays Bank PLC for certain purposes.

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The Notes are not sponsored, endorsed, sold or promoted by S&P Dow Jones, SPFS, or any of their respective affiliates (collectively, “S&P”). S&P does not make any representation or warranty, express or implied, to the owners of the Notes or any member of the public regarding the advisability of investing in securities generally or in the Notes particularly or the ability of the Underlier to track general market performance. S&P’s only relationship to Barclays Bank PLC with respect to the Underlier is the licensing of the Underlier and certain trademarks, service marks and/or trade names of S&P and/or its licensors. The Underlier is determined, composed and calculated by S&P without regard to Barclays Bank PLC or the Notes. S&P has no obligation to take the needs of Barclays Bank PLC or the owners of the Notes into consideration in determining, composing or calculating the Underlier. S&P is not responsible for and has not participated in the determination of the prices, and amount of the Notes or the timing of the issuance or sale of the Notes or in the determination or calculation of the equation by which the Notes are to be converted into cash, surrendered or redeemed, as the case may be. S&P has no obligation or liability in connection with the administration, marketing or trading of the Notes. There is no assurance that investment products based on the Underlier will accurately track the performance of the index or provide positive investment returns. S&P Dow Jones is not an investment advisor. Inclusion of an instrument within the Underlier is not a recommendation by S&P to buy, sell, or hold such security, nor is it considered to be investment advice. In addition, CME Group Inc. and its affiliates may trade financial products which are linked to the performance of the Underlier. It is possible that this trading activity will affect the value of the Underlier and the Notes.

S&P DOES NOT GUARANTEE THE ADEQUACY, ACCURACY, TIMELINESS AND/OR THE COMPLETENESS OF THE UNDERLIER OR ANY DATA RELATED THERETO OR ANY COMMUNICATION (INCLUDING BUT NOT LIMITED TO, ORAL OR WRITTEN COMMUNICATION (INCLUDING ELECTRONIC COMMUNICATIONS)) WITH RESPECT THERETO. S&P SHALL NOT BE SUBJECT TO ANY DAMAGES OR LIABILITY FOR ANY ERRORS, OMISSIONS, OR DELAYS THEREIN. S&P MAKES NO EXPRESS OR IMPLIED WARRANTIES, AND EXPRESSLY DISCLAIMS ALL WARRANTIES, OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OR USE OR AS TO RESULTS TO BE OBTAINED BY BARCLAYS BANK PLC, OWNERS OF THE NOTES, OR ANY OTHER PERSON OR ENTITY FROM THE USE OF THE UNDERLIER OR WITH RESPECT TO ANY DATA RELATED THERETO. WITHOUT LIMITING ANY OF THE FOREGOING, IN NO EVENT WHATSOEVER SHALL S&P BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES INCLUDING BUT NOT LIMITED TO, LOSS OF PROFITS, TRADING LOSSES, LOST TIME OR GOODWILL, EVEN IF THEY HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES, WHETHER IN CONTRACT, TORT, STRICT LIABILITY, OR OTHERWISE. THERE ARE NO THIRD PARTY BENEFICIARIES OF ANY AGREEMENTS OR ARRANGEMENTS BETWEEN S&P AND BARCLAYS BANK PLC, OTHER THAN THE LICENSORS OF S&P.

THE UNDERLYING FUTURES CONTRACTS

E-mini^® S&P 500^® futures contracts are U.S. dollar-denominated futures contracts, based on the S&P 500^® Index, traded on the Exchange, representing a contract unit of $50 multiplied by the S&P 500^® Index, measured in cents per index point.

E-mini^® S&P 500^® futures contracts listed for the nearest nine quarters, for each March, June, September and December, and the nearest three Decembers are available for trading. Trading of the E-mini^® S&P 500^® futures contracts will terminate at 9:30 a.m. Eastern time on the third Friday of the contract month.

The daily settlement prices of the E-mini^® S&P 500^® futures contracts are based on trading activity in the relevant contract (and in the case of a lead month also being the expiry month, together with trading activity on lead month-second month spread contracts) on the Exchange during a specified settlement period. The final settlement price of E-mini^®S&P 500^®futures contracts is based on the opening prices of the component stocks in the S&P 500^®Index, determined on the third Friday of the contract month.

OVERVIEW OF FUTURES MARKETS

Futures contracts are contracts that legally obligate the holder to buy or sell an asset at a predetermined delivery price during a specified future time period. Futures contracts are traded on regulated futures exchanges, in the over-the-counter market and on various types of physical and electronic trading facilities and markets. The futures contracts included in the Underlier are exchange-traded futures contracts. An exchange-traded futures contract provides for the purchase and sale of a specified type and quantity of an underlying asset or financial instrument during a stated delivery month for a fixed price. A futures contract provides for a specified settlement month in which the cash settlement is made or in which the underlying asset or financial instrument is to be delivered by the seller (whose position is therefore described as “short”) and acquired by the purchaser (whose position is therefore described as “long”).

No purchase price is paid or received on the purchase or sale of a futures contract. Instead, an amount of cash or cash equivalents must be deposited with the broker as “initial margin.” This amount varies based on the requirements imposed by the exchange clearing houses, but it may be lower than 5% of the notional value of the contract. This margin deposit provides collateral for the obligations of the parties to the futures contract.

By depositing margin, which may vary in form depending on the exchange, with the clearing house or broker involved, a market participant may be able to earn interest on its margin funds, thereby increasing the total return that it may realize from an investment in futures contracts.

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In the United States, futures contracts are traded on designated contract markets. At any time prior to the expiration of a futures contract, a trader may elect to close out its position by taking an opposite position on the exchange on which the trader obtained the position, subject to the availability of a liquid secondary market. This operates to terminate the position and fix the trader’s profit or loss. Futures contracts are cleared through the facilities of a centralized clearing house and a brokerage firm, referred to as a “futures commission merchant,” which is a member of the clearing house.

Unlike equity securities, futures contracts, by their terms, have stated expirations. At a specific point in time prior to expiration, trading in a futures contract for the current delivery month will cease. As a result, a market participant wishing to maintain its exposure to a futures contract on a particular asset or financial instrument with the nearest expiration must close out its position in the expiring contract and establish a new position in the contract for the next delivery month, a process referred to as “rolling.” For example, a market participant with a long position in a futures contract expiring in November who wishes to maintain a position in the nearest delivery month will, as the November contract nears expiration, sell the November contract, which serves to close out the existing long position, and buy a futures contract expiring in December. This will “roll” the November position into a December position, and, when the November contract expires, the market participant will still have a long position in the nearest delivery month.

Futures exchanges and clearing houses in the United States are subject to regulation by the Commodity Futures Trading Commission. Exchanges may adopt rules and take other actions that affect trading, including imposing speculative position limits, maximum price fluctuations and trading halts and suspensions and requiring liquidation of contracts in certain circumstances.

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FAQ

What is Barclays (ATMP) issuing in this 424B2?

Unsecured notes linked to the S&P 500 Futures Excess Return Index, part of Global Medium‑Term Notes, Series A.

How do the S&P 500 Futures ER notes pay at maturity?

If the index return is ≥ 0.00%: $1,000 + ($1,000 × return × 1.07). If < 0.00% to ≥ -6.75%: $1,000 + ($1,000 × return). Below -6.75%: $932.50.

What are the key dates for these Barclays notes?

Initial Valuation Date: Oct 30, 2025; Issue Date: Nov 4, 2025; Final Valuation Date: Oct 30, 2028; Maturity Date: Nov 2, 2028.

What are the denomination, pricing, and commissions?

Minimum denomination $1,000. Price to public 100.00%. Agent’s commission 0.90%, yielding 99.10% proceeds to Barclays per note.

What is the expected estimated value of the notes?

Barclays expects an estimated value between $922.30 and $982.30 per $1,000 note on the pricing date.

Are these notes listed on an exchange?

No. The notes will not be listed on any U.S. securities exchange or quotation system.

What risks are highlighted, including bail-in?

Investors may lose up to 6.75% of principal, have no dividends, and consent to any U.K. Bail-in Power, which could reduce or convert payments.