LONDON (MarketWatch) -- The Spanish government on Thursday successfully completed a sale of 10- and 30-year bonds. Financial market participants had been nervously eyeing the sale amid concerns over Spain's public finances. The Spanish Treasury said it sold 3 billion euros ($3.7 billion) worth of 10-year bonds and 479 million euros of 30-year bonds. The supply appeared to be "comfortably absorbed," said Nick Stamenkovic, fixed-income economist at RIA Capital in Edinburgh, although yields rose. The maximum yield on the 10-year was 4.911%, while the maximum yield on the 30-year was 5.937%, the government said. The euro /quotes/comstock/21o!x:seurusd (CUR_EURUSD 1.2364, +0.0064, +0.5203%) edged higher versus the U.S. dollar to change hands at $1.2341, a gain of 0.3%.