Banco Santander, S.A., in accordance with the provisions of the securities market legislation, communicated the following: Banco Santander, S.A. announced the results of its tender offer (the "Offer") to purchase for cash up to $850,000,000 (the "Maximum Offer Amount") of its outstanding 4.750% Non-Step-Up Non-Cumulative Contingent Convertible Perpetual Preferred Tier 1 Securities of Banco Santander (the "Securities"). The Offer was made on the terms and subject to the conditions set out in the Offer to Purchase dated May 27, 2026 (the "Offer to Purchase"). Based on information provided by the Tender Agent, $701,600,000 aggregate principal amount of the Securities listed in the table below were validly tendered and not validly withdrawn by 5:00 p.m., New York City time, on June 9, 2026 (the "Expiration Deadline"), as more fully set forth below.

Banco Santander has accepted all Securities that were validly tendered and not validly withdrawn prior to the Expiration Deadline, without proration. The Settlement Date is expected to be June 11, 2026. Securities purchased by Banco Santander pursuant to the Offer will be cancelled and will not be re-issued or re-sold.

Securities which have not been validly submitted and accepted for purchase pursuant to the Offer will remain outstanding. The aggregate principal amount of Securities outstanding after the Offer is $298,400,000. The table below sets forth, among other things, the principal amount of the Securities validly tendered and accepted pursuant to the Offer: 4.750% Non-Step-Up Non-Cumulative Contingent Convertible Perpetual Preferred Tier 1 Securities, CUSIP No.

05971K AH2 /ISIN: US05971KAH23, Purchase Price 100.1%, $1,001 per $1,000 of nominal amount tendered, provided that Securities may only be tendered in multiples of $200,000, $701,600,000 aggregate principal amount accepted, $298,400,000 aggregate principal amount outstanding after the Offer. The Purchase Price shall be 100.1% of the nominal amount of the Securities accepted for purchase pursuant to the Offer. Securities could only be tendered in multiples of $200,000, being the liquidation preference of the Securities.

The Tender Consideration payable on the Settlement Date to a holder whose Securities are validly tendered and accepted for purchase by the Offeror pursuant to the Offer will be an amount per $1,000 of nominal amount of such tendered securities in $equal to the product of (x) the Purchase Price and (y) the nominal amount of such Securities. In addition to the Tender Consideration, holders whose Securities are validly tendered and accepted for purchase will receive the Distribution Payment, if any, in respect of such Securities. With respect to any Securities validly tendered and accepted for purchase by the Offeror pursuant to the Offer, the "Distribution Payment" is an amount in cash (rounded to the nearest $0.01, with $0.005 being rounded upwards) equal to the Distribution on such Securities.

"Distributions" consist of distributions accrued and unpaid (if any) on the Securities from (and including) the distribution payment date in respect of such Securities immediately preceding the Settlement Date to (but excluding) the Settlement Date, calculated in accordance with the terms and conditions of the Securities, unless distributions on the Securities for that period are cancelled. D.F. King & Co. Inc. acted as tender agent for the Offer.

Santander US Capital Markets LLC acted as Dealer Manager for the Offer.