This paper presents a multifactorial quantitative corpus-based analysis of the distribution of English-only ads in the Low Countries. The dataset consists of approximately one thousand job ads, published in Vacature (a Belgian Dutch job ad magazine) and Intermediair (a Netherlandic Dutch job ad magazine) in 2007 and 2008. About one in seven ads are written entirely in English. Using logistic regression analysis, it is found that the occurrence of English-only advertising is mainly linked to occupational contexts where English plays a practical role: the phenomenon is typical for companies with headquarters located outside of the Low Countries (specifically US/UK-based companies), for companies with English-oriented corporate communication and for companies that are recruiting for IT and technical staff. Finally, more English-only ads are published in Flanders than in The Netherlands.