Wiki1000+ is a corpus of articles from Wikipedia, compiled for the purposes of the study of multiword expressions (MWEs) in Bulgarian. The Wiki1000+ corpus contains 6,311 text samples with at least 1,000 tokens each, amounting to 13.4 million tokens. The corpus is a part of the Bulgarian National Corpus. Wiki1000+ is annotated with the following linguistic information: sentence boundaries, tokenisation, lemmatisation, POS tagging, and MWE annotation. MWE annotation includes MWE id, labelling the components of the MWE and determining the type of the MWE according to a classification based on idiomaticity.