LONDON (Dow Jones)--Spain's Banco Santander SA is planning to issue a euro-denominated, benchmark bond, maturing in August 2014, and has set guidance in the area of 160 basis points over mid-swaps, one of the banks running the sale said Thursday. HSBC Holdings PLC, Natixis, and Santander are joint-lead managers of the deal. Pricing is expected later Thursday. The issuer is rated Aa2 by Moody's Investors Service, and AA by Standard & Poor's Corp. and Fitch Ratings. -By Mark Brown, Dow Jones Newswires; + 44 (0)207 842 9485, [email protected] (END) Dow Jones Newswires July 29, 2010 04:28 ET (08:28 GMT)