FORM 6-K

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Report of Foreign Issuer

Pursuant to Rule 13a-16 or 15d-16

of the Securities Exchange Act of 1934

For the month of August, 2026

Commission File Number: 001-12568

BBVA Argentina Bank S.A.

(Translation of registrant’s name into English)

111 Córdoba Av, C1054AAA

Buenos Aires, Argentina

(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:

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):

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):

Indicate by check mark whether by furnishing the information contained in this Form, the Registrant is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934:

If “Yes” is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): N/A

Banco BBVA Argentina S.A.

TABLE OF CONTENTS

2Q26 ConferenceCall Friday, August28, 2026 -12:00 p.m. Buenos Aires time –(11:00 a.m. EST) To participateclickhereto register BBVA Argentina August27th, 2026 Buenos Aires, Argentina 2Q26 Earnings Release InterestincomeimpactedbyadecreaseininterestratesandCPI-linkedbonds,offsetbyareducedmonetarypositionloss. Lower operating expenses with a positive impact on efficiency ratios Loanlossallowancesremainhigh,althoughshowingamoderateslowdown 1 3 2 Highlights 2Q26 Earnings Release Operating expenses: Personnel benefits + Administrative expenses + Depreciation & Amortization + Other operating expenses Financial margin: Net income from financial instruments at FV through P&L + Net loss from write-down of assets at amortized costand fair value through OCI + Foreign exchange and gold gains 2Q26 Net Income 2Q26 Highlights 2Q26Highlights Net Income (AR$ billion, INFLATION ADJUSTED) Macroeconomic indicators June 30, 2026 Inflation: 6.8%QoQ; 19.3%YTD; 33.5%YoY. Official FX A 3500: AR$ 1,483.0(+7.2% QoQ, +38.1% YoY) TAMAR: 22.6% APR–25.2% APY +45% +14% 2Q26 $ Var QoQ Var YoY Net Interest Income 912.2 bn-2.9%+15.4% Net Fee Income 178.9 bn-1.3%+42.5% Loan Loss Allowances 303.8 bn+16.2%+57.4% Operating Expenses 596.2 bn-5.0%-7.6% ROA ROE AR$ 131.6bn 2Q26 Net Income AR$ 222.5bn 2026 Net Income Substantial improvement in net interest incomedriven by lower average funding rates, alongside higher fee income. Strong operating performance, showing a positive trend in the efficiency ratio. Loan loss allowances still at high levels concentrated in retail products with prudent origination 1 3 2 Highlights 2Q26 Earnings Release Operating expenses: Personnel benefits + Administrative expenses + Depreciation & Amortization + Other operating expenses Financial margin: Net income from financial instruments at FV through P&L + Net loss from write-down of assets at amortized costand fair value through OCI + Foreign exchange and gold gains 1H26 Highlights 1H26Highlights 1H26 Net Income 1H26 $ Var YoY Net Interest Income 1.85 tn+18.9% Net Fee Income 360.2 bn+35.0% Loan Loss Allowances 565.2 bn+72.0% Operating Expenses 1.2 tn-1.7% Loss from net monetary position 410.0 bn+13.8% Quarterly efficiency Ratio (%, INFLATION ADJUSTED) Net Interest Income (net of monetary position result)& Adjusted NIM** (AR$ billion, INFLATION ADJUSTED) Fees-to-Expenses Ratio (Fees / Expenses) (%, INFLATION ADJUSTED) Cost of Risk (%, INFLATION ADJUSTED) Macroeconomic indicators June 30, 2026 Inflation: 6.8%QoQ; 19.3%YTD; 33.5%YoY. Official FX A 3500: AR$ 1,483.0(+7.2% QoQ, +38.1% YoY) TAMAR: 22.6% APR–25.2% APY NPL & COVERAGE PRIVATE DEPOSITS MARKET SHARE* Private Deposits **Other includes special saving accounts and Checking accounts include interest-bearing checking accounts. Private Loans (AR$ BILLION, INFLATION ADJUSTED) Moderate growth, primarily in commercial loans (%, CONSOLIDATED, INFLATION ADJUSTED) Cost of Risk: Current period loan loss allowances / Total average loans. Total average loans calculated as the average between loans at prior period end, and total loans in the current period. *Source: Informe sobre bancos, BCRA, June 2026. Quarterly growth with stable market share PRIVATE LOAN AND DEPOSITS MARKET SHARE % vs 2020 TOTAL GROSS LOANS / TOTAL DEPOSITS * RPC includes 100% of quarterly results CAPITAL RATIO % (AR$ BILLION, INFLATION ADJUSTED) *Based on daily information from BCRA. Capital balance as of last day of every quarter. Consolidates PSA, VWFS, Rombo & FCA. Retail: consumer, mortgages, credit cards, pledge and loans to personnel. Commercial: discounted instruments, overdrafts, financial leases, financing and prefinancing of exports, other loans. 2Q26 Highlights 81%82% 85% 48% 44%45% TOTAL LIQUID ASSETS/ TOTAL DEPOSITS PRIVATE LOANS MARKET SHARE* +13% +2% +8% +4% +350 bps +278 bps BBVA loans BBVA deposits 11.5% 8% System NPL* 7.22% Jun’26 2Q25 1Q26 2Q26 11.49% 12.00% 12.00% 2Q25 1Q26 2Q26 9.65% 9.90% 9.91%

Banco BBVA Argentina S.A. announces Second Quarter 2026

Buenos Aires, August 27, 2026 – Banco BBVA Argentina S.A (NYSE; BYMA; MAE: BBAR; LATIBEX: XBBAR) (“BBVA Argentina” or “BBVA” or “the Bank”) announced today its consolidated results for the second quarter (2Q26), ended on June 30, 2026. As of January 1, 2020, the Bank started to inform its inflation adjusted results pursuant to IAS 29 reporting. To facilitate comparison, figures of comparable quarters of 2025 and 2026 have been updated according to IAS 29 reporting to reflect the accumulated effect of inflation adjustment for each period up to June 30, 2026.

2Q26 & 1H26 Highlights

	2Q26 Earnings Release	p.2

Message from the CFO

“BBVA Argentina closed 2Q26 with a net profit of $131.5 billion, equivalent to a 12.2% quarterly ROE and representing a 44.6% improvement compared with the previous quarter. As the decline and stabilization of interest rates continue to take hold, the main drivers of the improvement were relatively stable financial income in a lower-inflation environment and rigorous cost control. The quarterly efficiency ratio of our operating platform stood at 45.0%, improving by 640 bps compared with 1Q26.

During the second quarter, inflation continued to decline, reinforcing expectations that this trend will consolidate. This environment should support a recovery in lending and consumption, together with an improvement in real incomes.

Economic activity, although uneven across sectors, is showing signs of growth overall. At the same time, announcements and approvals of projects under the RIGI continued, totaling more than USD15 billion during the quarter, with the potential to increase capital inflows and strengthen the trade balance.

The Treasury also made progress in improving its debt maturity profile. It extended a significant portion of local-currency maturities to 2028 and 2029 and, in foreign currency, lengthened the maturities of REPO agreements with banks and the swap agreement with China, while also securing financing backed by international financial institutions. These developments, together with reserve purchases of more than USD 13 billion, are helping to reduce uncertainty and strengthen the macroeconomic outlook.

The second quarter showed an incipient increase in lending activity, gradually reflecting the effects of the aforementioned decline in interest rates and improved seasonality, although still affected by elevated levels of non-performing loans. BBVA’s private-sector loan portfolio grew by 2.1% in the second quarter, although it still posted a slight cumulative decline year to date. These trends are broadly in line with those observed across the financial system as a whole. The best-performing products were prefinancing of exports, pledge loans and mortgage loans.

With regard to asset quality, although non-performing loan levels remain elevated, we can identify signs of improvement in certain indicators, such as early-stage delinquencies. BBVA’s NPL ratio stood at 6.09%, up 49 bps during the quarter. The financial system ratio was 7.22% by the end of June 2026, with a change of 54 bps since March. The cost of risk reached 7.13%, broadly in line with the first-quarter figure when adjusted for non-recurring effects.

BBVA Argentina’s main competitive advantages include a strong liquidity and capital position, technological capabilities and a highly capable team. With a Common Equity Tier 1 (CET1) ratio of 18.8%, BBVA Argentina maintains a robust capital position to support its growth strategy.

While the current environment requires tactical adjustments, we remain firmly on course and continue strengthening our capabilities to capture the opportunities that will emerge as the cycle regains momentum, creating value for our customers and investors and contributing to the country’s productive development.”

Carmen Morillo Arroyo, CFO at BBVA Argentina

	2Q26 Earnings Release	p.3

Safe Harbor Statement

This press release contains certain forward-looking statements that reflect the current views and/or expectations of Banco BBVA Argentina and its management with respect to its performance, business and future events. We use words such as “believe,” “anticipate,” “plan,” “expect,” “intend,” “target,” “estimate,” “project,” “predict,” “forecast,” “guideline,” “seek,” “future,” “should” and other similar expressions to identify forward-looking statements, but they are not the only way we identify such statements. Such statements are subject to a number of risks, uncertainties and assumptions. We caution you that a number of important factors could cause actual results to differ materially from the plans, objectives, expectations, estimates and intentions expressed in this release. Actual results, performance or events may differ materially from those in such statements due to, without limitation, (i) changes in general economic, financial, business, political, legal, social or other conditions in Argentina or elsewhere in Latin America or changes in either developed or emerging markets, (ii) changes in regional, national and international business and economic conditions, including inflation, (iii) changes in interest rates and the cost of deposits, which may, among other things, affect margins, (iv) unanticipated increases in financing or other costs or the inability to obtain additional debt or equity financing on attractive terms, which may limit our ability to fund existing operations and to finance new activities, (v) changes in government regulation, including tax and banking regulations, (vi) changes in the policies of Argentine authorities, (vii) adverse legal or regulatory disputes or proceedings, (viii) competition in banking and financial services, (ix) changes in the financial condition, creditworthiness or solvency of the customers, debtors or counterparties of Banco BBVA Argentina, (x) increase in the allowances for loan losses, (xi) technological changes or an inability to implement new technologies, (xii) changes in consumer spending and saving habits, (xiii) the ability to implement our business strategy and (xiv) fluctuations in the exchange rate of the Peso. The matters discussed herein may also be affected by risks and uncertainties described from time to time in Banco BBVA Argentina’s filings with the U.S. Securities and Exchange Commission (SEC) and Comisión Nacional de Valores (CNV). Readers are cautioned not to place undue reliance on forward-looking statements, which speak only as the date of this document. Banco BBVA Argentina is under no obligation and expressly disclaims any intention or obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

Information

This earnings release has been prepared in accordance with the accounting framework established by the Central Bank of Argentina (“BCRA”), based on International Financial Reporting Standards (“I.F.R.S.”) and the resolutions adopted by the International Accounting Standards Board (“I.A.S.B”) and by the Federación Argentina de Consejos Profesionales de Ciencias Económicas (“F.A.C.P.E.”), and with the the exclusion of the application of the IFRS 9 impairment model for non-financial public sector debt instruments.

The information in this press release contains unaudited financial information that consolidates, line item by line item, all of the banking activities of BBVA Argentina, including: BBVA Asset Management Argentina S.A.U. Sociedad Gerente de Fondos Comunes de Inversión, Consolidar AFJP-undergoing liquidation proceeding, PSA Finance Argentina Compañía Financiera S.A. (“PSA”) , Volkswagen Financial Services Compañía Financiera S.A (“VWFS”) , FCA Compañía Financiera S.A. ("FCA") and BBVA Securities Argentina S.A.U.

BBVA Seguros Argentina S.A. is disclosed on a consolidated basis recorded as Investments in associates (reported under the proportional consolidation method), and the corresponding results are reported as “Income from associates”), same as Rombo Compañía Financiera S.A. (“Rombo”), Play Digital S.A. (“MODO”), Openpay Argentina S.A. and Interbanking S.A.

Financial statements of subsidiaries have been elaborated as of the same dates and periods as Banco BBVA Argentina S.A.’s. In the case of consolidated companies PSA, VWFS and FCA, financial statements were prepared considering the B.C.R.A. accounting framework for institutions belonging to “Group C”, considering the model established by the IFRS 9 5.5. “Impairment” section for periods starting as of January 1, 2022, excluding debt instruments from the non-financial public sector.

The information published by the BBVA Group for Argentina is prepared according to IFRS, without considering the temporary exceptions established by BCRA.

	2Q26 Earnings Release	p.4

Quarterly Results

As of 2Q26, BBVA Argentina achieved a net income of $131.6 billion, representing an increase of 44.6% for the quarter and 65.2% versus 2Q25. The ROE for the quarter reached 12.2%, and the ROA 1.8%.

The 44.6% increase in quarterly results is mainly explained by Operating Income remaining relatively stable in a lower-inflation environment. Some of the items that help explain the variations are (i) lower losses from the Net Monetary Position Result, (ii) lower Operating Expenses, and (iii) results from write-down of assets at amortized cost and at FV through OCI .

Loan loss allowances remain at an elevated level. Although a 16.2% increase is observed, it should be noted that the 1Q26 figure included one-off positive effects, as mentioned at the time. Excluding these effects, the level of loan loss allowances in 2Q26 remains relatively stable.

Other operating expenses decreased by 5.6% QoQ, reflecting the lower impact of turnover tax as a result of the decline in interest rates.

The result from the net monetary position was 24.3% lower than in the previous quarter, in a context of declining inflation (6.76%¹ compared to 9.44% in 1Q26).

It should be noted that the figures for 2Q25 do not reflect the impact of the incorporation of FCA Compañía Financiera, as the integration became effective at a later date, on December 31, 2025.

¹ Source: Instituto Nacional de Estadística y Censos (INDEC)

	2Q26 Earnings Release	p.5

The Other Comprehensive Income (OCI) line totaled a loss of $28.0 billion in 2Q26, resulting from the lower valuation of financial instruments at fair value (FV) with changes in OCI.

	2Q26 Earnings Release	p.6

Accumulated Results - 6 months

In the first six months of 2026, BBVA Argentina reported an accumulated net income of $222.6 billion, 14.0% higher than in the same period of 2025. This translates into an annualized accumulated ROE of 10.3% and ROA of 1.5%, compared with a six-month cumulative ROE of 9.6% and ROA of 1.5% in the same period of 2025.

The improvement in results was mainly driven by higher net interest income and net fee income, which more than offset the deterioration in loan loss allowances and the higher loss from the net monetary position result.

	2Q26 Earnings Release	p.7

	2Q26 Earnings Release	p.8

Net Interest Income

Net interest income in 2Q26 totaled $912.2 billion, decreasing by 2.9% QoQ and increasing by 15.4% YoY.

The decline in interest rates (the average TAMAR rate decreased by 914 bps compared to 1Q26, to 22.8%) led to a 22.8% quarterly decrease in interest expenses and an 11.3% reduction in interest income, resulting in the aforementioned slight contraction in net interest margin, given the higher volume of interest-bearing assets relative to interest-bearing liabilities. The asset categories most affected were those with shorter maturities, mainly commercial loans.

Conversely, income from UVA-linked instruments increased by 18.0% QoQ, reflecting not only the higher inflation recorded in recent months, but also the increased volume of mortgage loans and some portfolio rotation from bonds into CPI linked instruments. Of total interest income from CER/UVA adjustments, 55% was generated by securities linked to these indexes, while the remaining 45% was attributable to loans.

	2Q26 Earnings Release	p.9

NIM

As of 2Q26, the total net interest margin (NIM) stood at 18.2%, slightly below the 18.6% recorded in 1Q26 and 18.5% in 2Q25. While the peso-denominated NIM declined by 51 bps to 21.8% in 2Q26, driven by the slight decrease in net interest income mentioned above, the U.S. dollar-denominated NIM increased by 24 bps to 4.4%.

It is important to note that the NIM net of inflation costs, which in our view provides the best measure of the underlying evolution of the margin over time, increased by 70 bps in the second quarter to 14.7% and declined only slightly compared to 12 months ago, despite deposit rates being approximately 900 bps lower.

	2Q26 Earnings Release	p.10

Net Fee Income

Net fee income in 2Q26 totaled $179.0 billion, decreasing by 1.3% QoQ and increasing by 42.5% YoY. The 1Q26 figures included one-off positive impacts, as mentioned at the time, which affected both fee income and fee expenses. Taking these effects into account, 2Q26 showed a sequential improvement compared to the first quarter, mainly driven by higher credit card fee income and lower commercial expenses.

	2Q26 Earnings Release	p.11

Net Income from Measurement of Financial Instruments at Fair Value and Foreign Exchange and Gold Gains/Losses

Other Operating Income

In 2Q26, Other Operating Income totaled $64.4 billion, decreasing by 8.1% QoQ and increasing by 28.2% YoY. The lower result was mainly explained by lower credit and debit card fees, lower punitive interest income, and lower income from safe deposit box rentals.

	2Q26 Earnings Release	p.12

Operating Expenses

Personnel Benefits & Administrative Expenses

As of 2Q26, personnel benefits and administrative expenses totaled $354.8 billion, decreasing by 5.8% QoQ and by 8.2% YoY in real terms.

With regard to personnel benefits, 1Q26 included non-recurring severance expenses, which were substantially lower in 2Q26.

Administrative expenses decreased by 7.7% in 2Q26, mainly driven by the following items: (i) advertising, (ii) outsourced administrative services, (iii) armored transportation services, and (iv) document distribution. Some of these items were affected by a lower level of activity.

The quarterly efficiency ratio in 2Q26 stood at 45.0%, below the 51.4% recorded in 1Q26 and the 56.5% reported in 2Q25. The QoQ improvement was driven by lower expenses and a lower loss from the net monetary position during the quarter.

	2Q26 Earnings Release	p.13

The cumulative efficiency ratio as of 2Q26 stood at 48.1%, below the 51.4% recorded in 1Q26 and the 56.4% reported in 2Q25. The YoY improvement was explained by both the aforementioned decrease in expenses and the lower loss from the net monetary position.

Other Operating Expenses

In 2Q26, Other Operating Expenses totaled $204.6 billion, decreasing by 5.6% QoQ and by 9.9% compared to 2Q25.

The quarterly decline was mainly explained by lower turnover tax expenses, driven by the decline in interest rates.

Income from Associates

The income from associates line item shows the results of unconsolidated companies. During 2Q26, a gain of $319 million was recorded, mainly due to the Bank's shareholding in BBVA Seguros Argentina S.A., Rombo Compañía Financiera S.A., Interbanking S.A., Play Digital S.A., and Openpay Argentina S.A.

Income Tax

The accumulated income tax of six months of 2026 showed a loss of $100.2 million.

The accumulated effective tax rate of six months of 2026 was 31%², while in 2025 it was 36% .

² Income tax, in accordance with IAS No. 34, is recognized in interim periods based on the best estimate of the weighted average tax rate that the Entity expects for the year.

	2Q26 Earnings Release	p.14

Balance Sheet and Activity

Loans and other financing

As of 2Q26, the private loan portfolio totaled $17.1 trillion, increasing by 2.1% QoQ and by 13.1% compared to 2Q25. It should be noted that the 2Q25 figures do not include the consolidation of FCA.

	2Q26 Earnings Release	p.15

The QoQ growth was mainly driven by increases in discounted instruments, overdrafts, and mortgage loans. These increases were partially offset by a decline in other loans, mainly floorplan financing.

While a prudent approach to origination in consumer products (credit cards and consumer loans) remains in place, we highlight the continued momentum in mortgage lending, which continues to gain share within the retail loan portfolio, supported by financial stability and the strong credit performance this product has demonstrated.

In summary, the private loan portfolio in local currency increased by 2.0% QoQ, with a similar increase in foreign currency. The latter, mainly commercial loans, grew by 2.0% in U.S. dollars QoQ and by 50.1% YoY.

In nominal terms, BBVA Argentina’s retail, commercial, and total loan portfolios increased by 7.4%, 10.3%, and 8.7% QoQ, respectively, outpacing inflation in all cases.

Total loans accounted for 58% of total assets, compared to 59% in 1Q26 and 58% in 2Q25.

	2Q26 Earnings Release	p.16

Asset Quality

In 2Q26, the asset quality ratio (non-performing loans/total loans) increased from 5.60% to 6.09%, mainly driven by higher retail NPLs in credit cards and consumer loans. Commercial delinquencies remained well behaved, with a slight increase of 14 bps, mainly attributable to small businesses.

The coverage ratio (allowances/non-performing loans) reached 79.91% in 2Q26. This level is considered adequate, taking into account expected loss and recovery estimates based on the entity’s historical performance.

The quarterly cost of risk (loan-loss allowances/average total loans) reached 7.13% in 2Q26, compared with 6.14% in 1Q26. The increase was mainly driven by higher loan-loss allowances resulting from the aforementioned rise in delinquencies in the retail portfolio.

On a year-to-date basis, the cost of risk stood at 6.54% in 2Q26, compared with 4.89% in 2Q25.

Allowances for the Bank in 2Q26 reflect expected losses driven by the adoption of the IFRS 9 standards as of January 1, 2020, except for debt instruments issued by the nonfinancial government sector which were excluded from the scope of such standard.

	2Q26 Earnings Release	p.17

Public Sector Exposure

In 2Q26, total public-sector risk exposure, excluding exposure to the BCRA, amounted to $5.0 trillion, increasing by 13.8% QoQ and 24.3% YoY. Public-sector exposure, excluding exposure to the BCRA, represented 17.9% of total assets, up from 16.2% in 1Q26 and 15.8% in 2Q25.

	2Q26 Earnings Release	p.18

Deposits