The present invention provides a modified RNAi agent comprising a sense strand and an antisense strand, wherein the antisense strand targets an HBV mRNA; all of the nucleotide sugars of the RNAi agent are 2′-modified; and at least one of the sense and antisense strands is conjugated to at least one targeting ligand that comprises two or more building blocks connected to a biantennary or triantennary branched linker, optionally via one or more linking groups.