Companies and governments in emerging markets are selling more euro-denominated bonds than ever as they seek out lower borrowing costs and new investors.

Issuers from developing countries sold €40.2 billion ($55.3 billion) in euro-denominated debt so far in 2013, beating the full-year record of €32.3 billion from 2010, according to data provider Dealogic. This year's volume surpasses 2012 issuance by 34%. The figures count only deals marketed globally.