[6-K] BANCO BILBAO VIZCAYA ARGENTARIA, S.A. Current Report (Foreign Issuer)

Rhea-AI Filing Summary

Banco Bilbao Vizcaya Argentaria (BBVA) disclosed merger-related financial assumptions and estimated benefits tied to a proposed combination with Banco Sabadell. The filing cites post-tax synergies and shows Banco Sabadell net income of €1.6 billion (Capital Markets Day 2025) and BBVA average net income of €12 billion for 2025–2028 (2Q25 webcast). The combined-entity shares outstanding assume BBVA’s €1 billion buyback (announced Apr.25) is executed post-closing and that proceeds from the TSB sale and an extraordinary dividend are reinvested in shares, with modeling based on a €16.41 per-share BBVA price (Sep.19,2025) and a 100% take-up.

The filing estimates transaction effects on capital of -21 basis points at closing, turning into +40 basis points after the TSB sale and extraordinary dividend are completed. It projects recurring benefits of €5.4 billion per year following the merger and notes BBVA agreed to remedies with the CNMC to support SMEs and self-employed customers to help preserve credit volumes.

Positive

• Estimated post-tax synergies and quantified recurring benefits of €5.4 billion per year following the merger
• Pro forma capital improvement of +40 basis points following TSB sale and extraordinary dividend
• Explicit income metrics cited: Banco Sabadell net income €1.6 billion and BBVA average net income €12 billion (2025–2028)
• Regulatory remedies with CNMC aimed at supporting SMEs and preserving future credit volumes

Negative

• Immediate capital impact modeled as -21 basis points at transaction closing
• High execution risk due to reliance on multiple conditional items: 100% take-up, TSB sale, extraordinary dividend reinvestment, and a post-close buyback
• Modeling dependent on a specific BBVA share price assumption of €16.41 (Sep.19,2025), which may change
• Filing lacks detailed timelines, cost-to-achieve synergies, and sensitivity analysis to lower take-up or alternative proceeds

Insights

Financial Analyst

TL;DR: The combination projects meaningful recurring synergies and capital improvement after asset disposals, but relies on several execution-dependent assumptions.

BBVA presents quantified upside from the merger, including €5.4 billion in annual benefits and improved pro forma capital (+40 bps post-TSB sale and extraordinary dividend). The analysis explicitly depends on a set of conditional items: a full €1 billion buyback executed post-closing, 100% take-up of the offer, the successful sale of TSB and reinvestment of proceeds. These dependencies create execution risk; downside at closing is modeled as -21 basis points. For investors, the filing provides useful headline metrics but limited detail on timing, cost-to-achieve synergies, or sensitivity to lower take-up or alternative sale proceeds.

M&A Specialist

TL;DR: Transaction outline highlights material synergies and regulatory remedies, but multiple contingent actions drive the projected outcome.

The disclosure quantifies expected post-tax synergies and references regulatory remedies with the CNMC that appear designed to mitigate competitive concerns and preserve SME credit flows. The valuation base uses a specific BBVA share price (€16.41) and assumes full investor participation and reinvestment of sale proceeds, which are common but material assumptions in deal modeling. The filing is substantive on headline figures yet sparse on deal mechanics, integration costs, or contingency plans if key actions (TSB sale, extraordinary dividend, buyback) do not occur as modeled.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 6-K

REPORT OF FOREIGN ISSUER PURSUANT TO RULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of September, 2025

Commission file number: 1-10110

BANCO BILBAO VIZCAYA ARGENTARIA, S.A.

(Exact name of Registrant as specified in its charter)

BANK BILBAO VIZCAYA ARGENTARIA, S.A.

(Translation of Registrant’s name into English)

Calle Azul 4,

28050 Madrid

Spain

(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F:

Form 20-F   X         Form 40-F

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1):

Yes         No      X

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7):

Yes         No      X

PRESS RELEASE 09.22.2025

BBVA Increases Offer to Banco Sabadell Shareholders by 10% and Improves the

Tax Treatment of the Transaction

The BBVA Board of Directors has agreed to improve the offer to Banco Sabadell shareholders by 10 percent¹. In addition, the consideration will now be entirely in shares, so shareholders with capital gains would not be subject to taxation in Spain, if acceptance exceeds 50 percent of Banco Sabadell’s voting rights, as the transaction would qualify as tax neutral in that case. The Board of Directors has also agreed to waive both the possibility of making further improvements to the consideration and of extending the acceptance period.

“With this improved offer, we are putting an extraordinary proposal in the hands of Banco Sabadell shareholders —one that combines a historic valuation and price with the opportunity to participate in the substantial value generated by the integration. All of this will result in a significant increase in the expected earnings per share in the future, if they tender their shares” BBVA Chair Carlos Torres Vila said.

10% increase of the offer

The new offer, which entails one new BBVA share for every 4.8376 Banco Sabadell shares, represents an increase of 10 percent¹ and offers a exceptionally attractive proposition for Banco Sabadell shareholders:

● The offer values Banco Sabadell shares at 3.39 euros per share¹, at its highest levels in more than a decade.

¹ Calculated with BBVA share price at closing on Sept 19, 2025 (€16.41 per share).

The improved consideration of the offer for Banco de Sabadell, S.A. and the corresponding annex to the prospectus are subject to the authorization by the Spanish National Securities Market Commission (CNMV).

PRESS RELEASE 09.22.2025

● The current equivalent value of the offer has risen by 60 percent since April 29, 2024, the day before the merger talks were made public, increasing from the initial €12.2 billion² offer to the current €19.5 billion³.

² Considering BBVA undisturbed price (10.90€/Sh. as of Apr 29, 2024, a day before merger discussions were disclosed) at 4.83x share exchange ratio and 5,388 million shares.

³ Considering 17.0 €Bn payment in BBVA shares with a price of €16.41 per share (Sept. 19, 2025) plus Banco Sabadell’s shareholder remuneration distributed since the announcement of the tender offer (1.5€Bn cash dividends and 1.0€Bn share buybacks).

PRESS RELEASE 09.22.2025

● The new offer would give Banco Sabadell shareholders a 15.3 percent stake in BBVA, thus benefiting from the tremendous value generated by the integration project: with the merger, they will obtain earnings per share⁴ (which then determines dividend per share) c. 41 percent higher than with a standalone Sabadell.

● The premium over Banco Sabadell share price, which was very significant when the transaction was announced and well above that of similar transactions in European banking (c. 30 percentage points above the average of these deals⁵), will be substantially improved following this increase in the offer.

⁴ Earnings per share: estimated based on fully phased-in post-tax synergies, a net income of €1.6 Bn for Banco Sabadell as disclosed by Banco Sabadell in their Capital Markets Day 2025 presentation and €12 Bn for BBVA as the average net income for the period 2025–2028 as discussed during the 2Q25 earnings webcast call. The total shares outstanding for the combined entity assumes that (a) the €1 Bn share buyback announced by BBVA in Apr.25 is executed post closing of the voluntary tender offer and (b) that the capital generated, both from the TSB sale and the extraordinary dividend, is reinvested in shares of the combined entity. Numbers consider a 100% take-up and a price for BBVA of €16.41/share (Sep. 19, 2025).

⁵ Comparing the offers with the VWAP for the month prior to the disclosure of the transactions. For further details on this figure, see BBVA’s presentation about the offer to Banco Sabadell shareholders from Sept. 5, 2025.

PRESS RELEASE 09.22.2025

Improved tax regime⁶

The consideration is to be 100 percent in shares, so that, as a general rule, shareholders with capital gains would not be subject to taxation in Spain, if acceptance exceeds 50 percent of Banco Sabadell’s voting rights, as the transaction would qualify as tax neutral in that case.

Other relevant conditions

● The BBVA Board of Directors has decided to waive both the possibility of making further improvements to the consideration, pursuant to the provisions of Article 31.1 of Royal Decree 1066/2007, and of extending the acceptance period, under Article 23.2 of Royal Decree 1066/2007.

● Those Banco Sabadell shareholders who have already tendered their shares will also benefit from the improved terms of the offer.

● The take-up period will be suspended until the CNMV approves the corresponding supplement with the improved offer. Once approved, the take-up period will resume during the remaining days until the completion of the 30-day period previously established.

Financial impacts for BBVA shareholders following the offer increase

For BBVA shareholders, this transaction is also accretive in terms of earnings per share from the first year following the merger, with an improvement of c. 3 percent and a high return on investment (incremental ROIC of around 17 percent).

All this with a limited impact on the CET1 capital ratio of approximately -21 basis points at the closing of the transaction, which would result in +40 basis points once the closing of the sale of TSB is completed and the payment of the extraordinary dividend approved by Banco Sabadell is distributed⁷.

⁶ This communiqué is for information purposes only. It does not represent tax advising, nor is a substitute of a personal advice by a professional. Tax implications may vary depending on each individual situation.

⁷ Impacts in a take-up scenario of 100 percent.

PRESS RELEASE 09.22.2025

Strategic rationale and commitment to all stakeholders

The transaction aims to build a stronger bank and one with greater scale to address the structural challenges now facing the financial industry. The strategic rationale of the transaction has strengthened in recent months: in a context where Europe is set to increase spending and investment, the need for larger banks in the region has intensified.

In addition, scale is becoming increasingly important in the financial sector to address the fixed costs especially associated with growing investments in technology (digitization, cybersecurity, data and AI, among others). A greater scale makes it possible to spread these costs across a broader customer base, achieving greater efficiency.

The combination with Banco Sabadell is a growth project that will increase the capacity to finance businesses and households by an additional €5.4 billion per year, following the merger. Moreover, BBVA has taken on unprecedented remedies with the CNMC, which reflect a firm support to SMEs and the self-employed, who will benefit from guarantees to maintain future credit volumes that would not exist without this transaction.

“Banco Sabadell shareholders who accept the offer will be part of a bank with a much higher potential of growth and value creation, with an ability to achieve 41 percent higher earnings per share than they would obtain otherwise. We invite them to join us in building a project

PRESS RELEASE 09.22.2025

that will bring significant benefits to customers, employees and shareholders of both entities and to society as a whole,” BBVA CEO Onur Genç said.

CONTACT DETAILS:

BBVA Corporate Communications

Tel. +34 699 337 924

comunicacion.corporativa@bbva.com

For additional financial information about BBVA visit:

https://accionistaseinversores.bbva.com/

For more BBVA news visit: https://www.bbva.com

PRESS RELEASE 09.22.2025

About BBVA

BBVA is a global financial services group founded in 1857. The bank is present in more than 25 countries, has a strong leadership position in the Spanish market, is the largest financial institution in Mexico and it has leading franchises in South America and Turkey. In the United States, BBVA also has a significant investment, transactional, and capital markets banking business.

BBVA contributes with its activity to the progress and welfare of all its stakeholders: shareholders, clients, employees, providers and society in general. In this regard, BBVA supports families, entrepreneurs and companies in their plans, and helps them to take advantage of the opportunities provided by innovation and technology. Likewise, BBVA offers its customers a unique value proposition, leveraged on technology and data, helping them improve their financial health with personalized information on financial decision-making.

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Banco Bilbao Vizcaya Argentaria, S.A.

Date: September 22, 2025

By: /s/ Victoria del Castillo Marchese

Name: Victoria del Castillo Marchese

Title: Global Head of Strategy & M&A

FAQ

What synergies does BBVA report from the merger with Banco Sabadell (BBVXF)?

The filing cites projected post-tax synergies and quantifies recurring benefits of €5.4 billion per year following the merger.

How does the transaction affect BBVA's capital position?

BBVA models a -21 basis points capital impact at closing that would become +40 basis points after the sale of TSB and distribution of an extraordinary dividend by Banco Sabadell.

What key assumptions underlie the combined-entity share count?

Assumptions include execution of BBVA's €1 billion buyback post-closing, reinvestment of proceeds from the TSB sale and extraordinary dividend into shares, and a 100% take-up at a price of €16.41 per share (Sep.19,2025).

Does the filing mention regulatory conditions or remedies?

Yes. BBVA states it has accepted remedies with the CNMC intended to support SMEs and the self-employed to preserve future credit volumes.

What income figures are cited for Banco Sabadell and BBVA?

Banco Sabadell is cited with €1.6 billion net income (Capital Markets Day 2025) and BBVA with an average net income of €12 billion for 2025–2028 (2Q25 webcast).