Spanish bank Santander chairman Ana Patricia Botin attends a Let Girls Learn event, in Madrid, Spain, June 30, 2016. REUTERS/Andrea Comas 

Spanish bank Santander chairman Ana Patricia Botin attends a Let Girls Learn event, in Madrid, Spain, June 30, 2016. REUTERS/Andrea Comas 

Ana Patricia Botin (R), chairman of the Spanish bank Santander, the euro zone's largest lender by market value, attends a Let Girls Learn event, in Madrid, Spain, June 30, 2016. REUTERS/Andrea Comas 

A Santander logo is seen on a branch in central Madrid, Spain, in this file picture taken January 26, 2016. Spain's biggest bank Santander plans to lay off 1,200 staff as part of a country-wide restructuring plan, the Comisiones Obreras union said on April 6, 2016 after talks with the lender. REUTERS/Andrea Comas/Files 

People wait outside a Santander bank branch prior to its opening to the public in downtown Ronda, southern Spain, April 1, 2016. REUTERS/Jon Nazca TPX IMAGES OF THE DAY

Haas Formula One driver Esteban Gutierrez of Mexico (R) shakes hands with Rodrigo Brand de Lara, Deputy General Director of Institutional Relations and Communication of Grupo Financiero Santander Mexico, S.A.B. de C.V., during a news conference in Mexico City, Mexico, March 9, 2016. REUTERS/Edgard Garrido 

ATTENTION EDITORS: SPANISH LAW REQUIRES THAT THE FACES OF MINORS ARE MASKED IN PUBLICATIONS WITHIN SPAIN People use ATM machines at a Santander bank branch in Madrid, Spain, July 30, 2015. Santander, the euro zone's biggest bank, on Thursday posted an 18 percent rise in second quarter net profit from a year ago, helped by rising revenues in Britain and the United States. REUTERS/Susana Vera 

A woman walks past a Santander bank branch in Madrid, Spain, July 30, 2015. Santander, the euro zone's biggest bank, on Thursday posted an 18 percent rise in second quarter net profit from a year ago, helped by rising revenues in Britain and the United States. REUTERS/Susana Vera 

People walk past a Santander bank branch in Madrid, Spain, July 30, 2015. Santander, the euro zone's biggest bank, on Thursday posted an 18 percent rise in second quarter net profit from a year ago, helped by rising revenues in Britain and the United States. REUTERS/Susana Vera 

A demonstrator from the group called Black Bloc attacks a Santander bank branch, during a protest against bad conditions of public transport in Sao Paulo October 25, 2013. REUTERS/Nacho Doce (BRAZIL - Tags: POLITICS CIVIL UNREST BUSINESS) 

Traders await the Grupo Financiero Santander's first trade following it's IPO on the floor of the New York Stock Exchange, September 26, 2012. Grupo Financiero Santander Mexico, S.A.B. de C.V. is the first company from Mexico and the 4th Latin American company to list its IPO on NYSE Euronext markets in 2012. REUTERS/Brendan McDermid (UNITED STATES - Tags: BUSINESS) 

Traders await the Grupo Financiero Santander's first trade following it's IPO on the floor of the New York Stock Exchange, September 26, 2012. Grupo Financiero Santander Mexico, S.A.B. de C.V. is the first company from Mexico and the 4th Latin American company to list its IPO on NYSE Euronext markets in 2012. REUTERS/Brendan McDermid (UNITED STATES - Tags: BUSINESS) 

Grupo Financiero Santander CEO Marcos Martinez (L) celebrates his company's first trade following it's IPO on the floor of the New York Stock Exchange, September 26, 2012. Grupo Financiero Santander Mexico, S.A.B. de C.V. is the first company from Mexico and the 4th Latin American company to list its IPO on NYSE Euronext markets in 2012. REUTERS/Brendan McDermid (UNITED STATES - Tags: BUSINESS) 

Traders await the Grupo Financiero Santander's first trade following it's IPO on the floor of the New York Stock Exchange, September 26, 2012. Grupo Financiero Santander Mexico, S.A.B. de C.V. is the first company from Mexico and the 4th Latin American company to list its IPO on NYSE Euronext markets in 2012. REUTERS/Brendan McDermid (UNITED STATES - Tags: BUSINESS) 

Grupo Financiero Santander CEO Marcos Martinez speaks during an interview on the floor of the New York Stock Exchange, September 26, 2012. Grupo Financiero Santander Mexico, S.A.B. de C.V. is the first company from Mexico and the 4th Latin American company to list its IPO on NYSE Euronext markets in 2012. REUTERS/Brendan McDermid (UNITED STATES - Tags: BUSINESS) 

Grupo Financiero Santander CEO Marcos Martinez speaks during an interview on the floor of the New York Stock Exchange, September 26, 2012. Grupo Financiero Santander Mexico, S.A.B. de C.V. is the first company from Mexico and the 4th Latin American company to list its IPO on NYSE Euronext markets in 2012. REUTERS/Brendan McDermid (UNITED STATES - Tags: BUSINESS) 

Emilio Botin, chairman of Spain's largest bank Santander gives a speech at a hotel in Mexico City September 4, 2012. Spanish bank Santander said on Tuesday it would seek to raise up to 3.4 billion euros ($4.3 billion) through the stock market listing of a quarter of its Mexican unit as it looks to boost capital levels and weather a grinding recession at home. The euro zone's biggest bank said it would list 24.9 percent of Grupo Financiero Santander Mexico in what could be Mexico's biggest initial public offering ever, valuing the unit at up to 13.7 billion euros. REUTERS/Henry Romero (MEXICO - Tags: BUSINESS) 

Marcos Martinez, chief executive of Spanish bank Santander in Mexico (R) gives a speech next to Emilio Botin, chairman of Santander, during a news conference at a hotel in Mexico City September 4, 2012. Spanish bank Santander said on Tuesday it would seek to raise up to 3.4 billion euros ($4.3 billion) through the stock market listing of a quarter of its Mexican unit as it looks to boost capital levels and weather a grinding recession at home. The euro zone's biggest bank said it would list 24.9 percent of Grupo Financiero Santander Mexico in what could be Mexico's biggest initial public offering ever, valuing the unit at up to 13.7 billion euros. REUTERS/Henry Romero (MEXICO - Tags: BUSINESS) 

Emilio Botin, chairman of Spain's largest bank Santander, leaves after attend a news conference at a hotel in Mexico City September 4, 2012. Spanish bank Santander said on Tuesday it would seek to raise up to 3.4 billion euros ($4.3 billion) through the stock market listing of a quarter of its Mexican unit as it looks to boost capital levels and weather a grinding recession at home. The euro zone's biggest bank said it would list 24.9 percent of Grupo Financiero Santander Mexico in what could be Mexico's biggest initial public offering ever, valuing the unit at up to 13.7 billion euros. REUTERS/Henry Romero (MEXICO - Tags: BUSINESS) 

Emilio Botin, chairman of Spain's largest bank Santander, gives a speech during a news conference at a hotel in Mexico City September 4, 2012. Spanish bank Santander said on Tuesday it would seek to raise up to 3.4 billion euros ($4.3 billion) through the stock market listing of a quarter of its Mexican unit as it looks to boost capital levels and weather a grinding recession at home. The euro zone's biggest bank said it would list 24.9 percent of Grupo Financiero Santander Mexico in what could be Mexico's biggest initial public offering ever, valuing the unit at up to 13.7 billion euros. REUTERS/Henry Romero (MEXICO - Tags: BUSINESS) 

Emilio Botin, chairman of Spain's largest bank Santander, gives a speech during a news conference at a hotel in Mexico City September 4, 2012. Spanish bank Santander said on Tuesday it would seek to raise up to 3.4 billion euros ($4.3 billion) through the stock market listing of a quarter of its Mexican unit as it looks to boost capital levels and weather a grinding recession at home. The euro zone's biggest bank said it would list 24.9 percent of Grupo Financiero Santander Mexico in what could be Mexico's biggest initial public offering ever, valuing the unit at up to 13.7 billion euros. REUTERS/Henry Romero (MEXICO - Tags: BUSINESS) 

Emilio Botin, chairman of Spain's largest bank Santander, gives a speech during a news conference at a hotel in Mexico City September 4, 2012. Spanish bank Santander said on Tuesday it would seek to raise up to 3.4 billion euros ($4.3 billion) through the stock market listing of a quarter of its Mexican unit as it looks to boost capital levels and weather a grinding recession at home. The euro zone's biggest bank said it would list 24.9 percent of Grupo Financiero Santander Mexico in what could be Mexico's biggest initial public offering ever, valuing the unit at up to 13.7 billion euros. REUTERS/Henry Romero (MEXICO - Tags: BUSINESS) 

Emilio Botin, chairman of Spain's largest bank Santander, gives a speech during a news conference at a hotel in Mexico City September 4, 2012. Spanish bank Santander said on Tuesday it would seek to raise up to 3.4 billion euros ($4.3 billion) through the stock market listing of a quarter of its Mexican unit as it looks to boost capital levels and weather a grinding recession at home. The euro zone's biggest bank said it would list 24.9 percent of Grupo Financiero Santander Mexico in what could be Mexico's biggest initial public offering ever, valuing the unit at up to 13.7 billion euros. REUTERS/Henry Romero (MEXICO - Tags: BUSINESS) 

Emilio Botin, chairman of Spain's largest bank Santander, gives a speech during a news conference at a hotel in Mexico City September 4, 2012. Spanish bank Santander said on Tuesday it would seek to raise up to 3.4 billion euros ($4.3 billion) through the stock market listing of a quarter of its Mexican unit as it looks to boost capital levels and weather a grinding recession at home. The euro zone's biggest bank said it would list 24.9 percent of Grupo Financiero Santander Mexico in what could be Mexico's biggest initial public offering ever, valuing the unit at up to 13.7 billion euros. REUTERS/Henry Romero (MEXICO - Tags: BUSINESS) 

Red Bull Formula One driver Mark Webber (R) of Australia reacts after winning the British F1 Grand Prix at Silverstone, central England, July 11, 2010. REUTERS/Nigel Roddis (BRITAIN - Tags: SPORT MOTOR RACING IMAGES OF THE DAY) 

An illuminated sign depicting people walking is displayed at euro zone's largest bank Santander's headquarter in Boadilla del Monte, near Madrid, February 4, 2010. Santander, the euro zone's largest bank, maintained net profits at 8.9 billion euros ($12 billion) last year, with an overseas expansion into fast-growing areas like Brazil paying off while it battles a deep recession in Spain. REUTERS/Sergio Perez (SPAIN - Tags: BUSINESS) 

A woman walks past Santander bank branch in Rio de Janeiro October 7, 2009. Banco Santander (Brasil) SA shares started trade at $13.30 on the New York Stock Exchange, or 1 percent below its IPO price. On Tuesday, the bank, the Brazilian unit of Spanish bank Santander SA raised $8.05 billion in its initial public offering, the largest ever by a Brazilian company and the largest globally in 2009. REUTERS/Sergio Moraes (BRAZIL BUSINESS) 

Venezuela's President Hugo Chavez (2nd R) attends the 119 anniversary ceremony of Banco de Venezuela in Caracas September 21, 2009. Chavez on Monday attended the re-launch of Banco de Venezuela, which was nationalised in 2008. In May 2009, the Venezuelan government bought Spain's Grupo Santander's stake in Banco de Venezuela. REUTERS/Carlos Garcia Rawlins (VENEZUELA ANNIVERSARY BUSINESS POLITICS) 

Venezuela's President Hugo Chavez gestures as he speaks at the 119 anniversary ceremony of Banco de Venezuela in Caracas September 21, 2009. Chavez on Monday attended the re-launch of Banco de Venezuela, which was nationalised in 2008. In May 2009, the Venezuelan government bought Spain's Grupo Santander's stake in Banco de Venezuela. REUTERS/Carlos Garcia Rawlins (VENEZUELA ANNIVERSARY BUSINESS POLITICS) 

Venezuela's President Hugo Chavez speaks during the 119 anniversary ceremony of Banco de Venezuela in Caracas September 21, 2009. Chavez on Monday attended the re-launch of Banco de Venezuela, which was nationalised in 2008. In May 2009, the Venezuelan government bought Spain's Grupo Santander's stake in Banco de Venezuela. REUTERS/Carlos Garcia Rawlins (VENEZUELA ANNIVERSARY BUSINESS POLITICS) 

Venezuela's President Hugo Chavez speaks at the 119 anniversary ceremony of Banco de Venezuela in Caracas September 21, 2009. Chavez on Monday attended the re-launch of Banco de Venezuela, which was nationalised in 2008. In May 2009, the Venezuelan government bought Spain's Grupo Santander's stake in Banco de Venezuela. REUTERS/Carlos Garcia Rawlins (VENEZUELA ANNIVERSARY BUSINESS POLITICS) 

Venezuela's President Hugo Chavez attends the 119 anniversary ceremony of Banco de Venezuela in Caracas September 21, 2009. Chavez on Monday attended the re-launch of Banco de Venezuela, which was nationalised in 2008. In May 2009, the Venezuelan government bought Spain's Grupo Santander's stake in Banco de Venezuela. REUTERS/Carlos Garcia Rawlins (VENEZUELA ANNIVERSARY BUSINESS POLITICS) 

Argentina's President Cristina Fernandez de Kirchner (R) listens as her Venezuelan counterpart Hugo Chavez speaks during a news conference at the Casa Rosada Presidential Palace in Buenos Aires, May 15, 2009. Venezuelan President Hugo Chavez said on Friday that he does not have any plans for now to take over more banks, as the government finalizes a deal to buy a unit of Spain's Grupo Santander. REUTERS/Marcos Brindicci (ARGENTINA POLITICS BUSINESS) 

Venezuela's President Hugo Chavez gestures during a joint news conference with Argentina's President Cristina Fernandez de Kirchner (not pictured) at the Casa Rosada Presidential Palace in Buenos Aires, May 15, 2009. Venezuelan President Hugo Chavez said on Friday that he does not have any plans for now to take over more banks, as the government finalizes a deal to buy a unit of Spain's Grupo Santander. REUTERS/Marcos Brindicci (ARGENTINA POLITICS BUSINESS) 

Argentina's President Cristina Fernandez de Kirchner (R) and her Venezuelan counterpart Hugo Chavez attend during a news conference at the Casa Rosada Presidential Palace in Buenos Aires, May 15, 2009. Venezuelan President Hugo Chavez said on Friday that he does not have any plans for now to take over more banks, as the government finalizes a deal to buy a unit of Spain's Grupo Santander. REUTERS/Marcos Brindicci (ARGENTINA POLITICS BUSINESS) 

Argentina's President Cristina Fernandez de Kirchner (R) and her Venezuelan counterpart Hugo Chavez kiss and shake hands at the end of a news conference at the Casa Rosada Presidential Palace in Buenos Aires, May 15, 2009. Venezuelan President Hugo Chavez said on Friday that he does not have any plans for now to take over more banks, as the government finalizes a deal to buy a unit of Spain's Grupo Santander. REUTERS/Marcos Brindicci (ARGENTINA POLITICS BUSINESS) 

Argentina's President Cristina Fernandez de Kirchner laughs during a news conference alongside Venezuela's President Hugo Chavez (not pictured) at the Casa Rosada Presidential Palace in Buenos Aires, May 15, 2009. Venezuelan President Hugo Chavez said on Friday that he does not have any plans for now to take over more banks, as the government finalizes a deal to buy a unit of Spain's Grupo Santander. REUTERS/Marcos Brindicci (ARGENTINA POLITICS BUSINESS) 

Venezuela's President Hugo Chavez gestures during a joint news conference with Argentina's President Cristina Fernandez de Kirchner (not pictured) at the Casa Rosada Presidential Palace in Buenos Aires, May 15, 2009. Venezuelan President Hugo Chavez said on Friday that he does not have any plans for now to take over more banks, as the government finalizes a deal to buy a unit of Spain's Grupo Santander. REUTERS/Marcos Brindicci (ARGENTINA POLITICS) 

Argentina's President Cristina Fernandez de Kirchner (R) and her Venezuelan counterpart Hugo Chavez gesture during a news conference at the Casa Rosada Presidential Palace in Buenos Aires, May 15, 2009. Venezuelan President Hugo Chavez said on Friday that he does not have any plans for now to take over more banks, as the government finalizes a deal to buy a unit of Spain's Grupo Santander. REUTERS/Marcos Brindicci (ARGENTINA POLITICS BUSINESS) 

Venezuela's President Hugo Chavez drinks coffee as he looks at Argentina's President Cristina Fernandez de Kirchner (not pictured) during a news conference at the Casa Rosada Presidential Palace in Buenos Aires, May 15, 2009. Venezuelan President Hugo Chavez said on Friday that he does not have any plans for now to take over more banks, as the government finalizes a deal to buy a unit of Spain's Grupo Santander. REUTERS/Marcos Brindicci (ARGENTINA POLITICS BUSINESS) 

Venezuela's President Hugo Chavez gestures during a joint news conference with Argentina's President Cristina Fernandez de Kirchner (not pictured) at the Casa Rosada Presidential Palace in Buenos Aires May 15, 2009. Venezuelan President Hugo Chavez said on Friday that he does not have any plans for now to take over more banks, as the government finalizes a deal to buy a unit of Spain's Grupo Santander. REUTERS/Marcos Brindicci (ARGENTINA POLITICS BUSINESS) 

Argentina's President Cristina Fernandez de Kirchner (R) and her Venezuelan counterpart Hugo Chavez look at their watches during a news conference at the Casa Rosada Presidential Palace in Buenos Aires May 15, 2009. Venezuelan President Hugo Chavez said on Friday that he does not have any plans for now to take over more banks, as the government finalizes a deal to buy a unit of Spain's Grupo Santander. REUTERS/Marcos Brindicci (ARGENTINA POLITICS BUSINESS) 

A man leaves a cash machine of Grupo Santander's Banco de Venezuela in Caracas March 20, 2009. Venezuela will go ahead with the nationalization of the local unit of Spanish bank Grupo Santander, President Hugo Chavez said on Thursday, weeks after officials said the purchase was on hold. REUTERS/Jorge Silva (VENEZUELA BUSINESS POLITICS) 

A man leaves a cash machine of Grupo Santander's Banco de Venezuela in Caracas March 20, 2009. Venezuela will go ahead with the nationalization of the local unit of Spanish bank Grupo Santander, President Hugo Chavez said on Thursday, weeks after officials said the purchase was on hold. REUTERS/Jorge Silva (VENEZUELA BUSINESS POLITICS) 

The headquarters of Grupo Santander's Banco Venezuela is seen in Caracas March 20, 2009. Venezuela will go ahead with the nationalization of the local unit of Spanish bank Grupo Santander, President Hugo Chavez said on Thursday, weeks after officials said the purchase was on hold. REUTERS/Jorge Silva (VENEZUELA BUSINESS POLITICS) 

The headquarters of Grupo Santander's Banco Venezuela is seen in Caracas March 20, 2009. Venezuela will go ahead with the nationalization of the local unit of Spanish bank Grupo Santander, President Hugo Chavez said on Thursday, weeks after officials said the purchase was on hold. REUTERS/Jorge Silva (VENEZUELA BUSINESS POLITICS) 

A man speaks on his mobile phone outside a branch of Grupo Santander's Banco Venezuela in Caracas March 20, 2009. Venezuela will go ahead with the nationalization of the local unit of Spanish bank Grupo Santander, President Hugo Chavez said on Thursday, weeks after officials said the purchase was on hold. REUTERS/Jorge Silva (VENEZUELA BUSINESS POLITICS) 

The headquarters of Grupo Santander's Banco Venezuela is seen in Caracas March 20, 2009. Venezuela will go ahead with the nationalization of the local unit of Spanish bank Grupo Santander, President Hugo Chavez said on Thursday, weeks after officials said the purchase was on hold. REUTERS/Jorge Silva (VENEZUELA BUSINESS POLITICS) 

Venezuelan President Hugo Chavez announces the nationalization of the local unit of Spanish bank Grupo Santander in Caracas March 19, 2009. Venezuela will go ahead with the nationalization, Chavez said on Thursday, weeks after officials said the purchase was on hold. REUTERS/Miraflores Palace/Handout (VENEZUELA POLITICS BUSINESS) 

A man walks past a branch of Spain's Grupo Santander bank in Caracas March 19, 2009. Venezuela will go ahead with the nationalization of the local unit of Spanish bank Grupo Santander, socialist President Hugo Chavez said on, weeks after officials said the purchase was on hold. REUTERS/Jorge Silva (VENEZUELA BUSINESS POLITICS) 

A man walks past a branch of Spain's Grupo Santander bank in Caracas March 19, 2009. Venezuela will go ahead with the nationalization of the local unit of Spanish bank Grupo Santander, socialist President Hugo Chavez said on , weeks after officials said the purchase was on hold. REUTERS/Jorge Silva (VENEZUELA BUSINESS POLITICS IMAGE OF THE DAY TOP PICTURE) 

Women walk past a branch of Spain's Grupo Santander bank in Caracas March 19, 2009. Venezuela will go ahead with the nationalization of the local unit of Spanish bank Grupo Santander, socialist President Hugo Chavez said on , weeks after officials said the purchase was on hold. REUTERS/Jorge Silva (VENEZUELA BUSINESS POLITICS) 

A man walks past a branch of Spain's Grupo Santander bank in Caracas March 19, 2009. Venezuela will go ahead with the nationalization of the local unit of Spanish bank Grupo Santander, socialist President Hugo Chavez said on , weeks after officials said the purchase was on hold. REUTERS/Jorge Silva (VENEZUELA BUSINESS POLITICS) 

People talk outside a branch of Spain's Grupo Santander bank in Caracas in this July 31, 2008 file photo. Venezuela will go ahead with the nationalization of the local unit of Spanish bank Grupo Santander, socialist President Hugo Chavez said on March 19, 2009, weeks after officials said the purchase was on hold. Picture taken July 31, 2008. REUTERS/Edwin Montilva/Files (VENEZUELA BUSINESS POLITICS) 

Alfredo Saenz, chief executive of Spain's biggest bank Santander, attends a news conference to present bank's 2008 annual results at company headquarters in Boadilla del Monte, near Madrid, February 5, 2009. Santander posted a 21.5 percent rise in net interest revenue, ex dividends, to 18.1 billion euros ($23.6 billion), thanks to a strong performance from core retail banking. REUTERS/Sergio Perez (SPAIN) 

Ana Botin, Member of the Board, Grupo Santander, Spain, attends a session at the World Economic Forum (WEF) in Davos January 29, 2009. Business leaders and policymakers meeting in Davos turn their attention to financial regulation, energy, trade and global security after hearing China and Russia blame debt-fuelled consumption for massive financial collapse. REUTERS/Pascal Lauener (SWITZERLAND) 

Ana Botin, Member of the Board, Grupo Santander, Spain, attends a session at the World Economic Forum (WEF) in Davos January 29, 2009. Business leaders and policymakers meeting in Davos turn their attention to financial regulation, energy, trade and global security after hearing China and Russia blame debt-fuelled consumption for massive financial collapse. REUTERS/Pascal Lauener (SWITZERLAND) 

A pedestrian stands beside a logo for Spain's Banco Santander in London January 28, 2009. Spain's Santander will compensate all individual clients who suffered losses in the alleged Bernard Madoff fraud, the bank said on Tuesday.The bank plans to issue 1.38 billion euros ($1.82 billion) in preferential shares with an annual 2 percent coupon to compensate its clients, it said. REUTERS/Toby Melville (BRITAIN) 

People walk past a Santander bank branch in central Madrid January 27, 2009. Spain's Santander and its private banking business Optimal are being sued in Florida for losses suffered by customers with investments in products hit by the Madoff scandal, Spanish lawyers said on Tuesday. REUTERS/Susana Vera (SPAIN) 

A man runs past a Santander bank branch in central Madrid December 15, 2008. Three European banks on Sunday announced a total of about $3.8 billion in exposure to an investment fund run by Bernard Madoff, the U.S. investor accused of running a $50 billion "Ponzi" scheme. The largest banks of both Spain and France, Santander and BNP Paribas and Swiss private bank Reichmuth & Co became the latest parties to detail possible losses over investments made with Madoff, who was arrested in New York on Thursday in the alleged fraud. REUTERS/Andrea Comas (SPAIN)