Banco Santander, S.A. (SAN) is currently considered the cheapest penny stock to buy. This banking giant has seen its stock price drop significantly, making it an attractive option for investors looking for a bargain. With its solid reputation and global presence, Banco Santander, S.A. offers investors the opportunity to invest in a well-established company at a discounted price. While the stock may be considered a penny stock due to its low price, it is important to note that Banco Santander, S.A. is a reputable company with a strong track record in the banking industry. Investors looking to capitalize on the current market conditions may find Banco Santander, S.A. to be a promising investment opportunity.